photosynthesis worksheet grade 7 pdf

Photosynthesis and Respiration

Photosynthesis and respiration are two vital processes that occur in living organisms . Photosynthesis is the process by which green plants, algae , and some bacteria convert light energy , carbon dioxide , and water into glucose and oxygen . Respiration , on the other hand, is the process by which cells break down glucose and other organic compounds to release energy that is used for cellular activities.

Photosynthesis

• Definition: Photosynthesis is the process by which green plants, algae , and some bacteria convert light energy , carbon dioxide , and water into glucose and oxygen .
• Equation: 6CO 2 + 6H 2 O + Light energy → C 6 H 12 O 6 + 6O 2
• Key Factors: Light , chlorophyll, carbon dioxide , and water are essential for photosynthesis to occur.
• Organisms : Photosynthesis occurs in green plants, algae , and some bacteria .

Respiration

• Definition: Respiration is the process by which cells break down glucose and other organic compounds to release energy that is used for cellular activities.
• Equation: C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O + Energy
• Key Factors: Oxygen and glucose are essential for respiration to occur.
• Organisms : Respiration occurs in all living organisms , including plants, animals, and microorganisms .

Study Guide

Here are some key points to remember when studying photosynthesis and respiration :

• Understand the chemical equations for photosynthesis and respiration and the products formed in each process.
• Learn about the organelles involved in these processes, such as chloroplasts in photosynthesis and mitochondria in respiration .
• Explore the factors that affect the rate of photosynthesis , such as light intensity, carbon dioxide concentration, and temperature .
• Understand the different types of respiration , including aerobic respiration (with oxygen ) and anaerobic respiration (without oxygen ).
• Explore the interconnected nature of photosynthesis and respiration in the carbon cycle and energy flow within ecosystems .

By understanding the intricacies of photosynthesis and respiration , you will gain valuable insights into the fundamental processes that sustain life on Earth .

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Photosynthesis Worksheets

Did you know the planet Earth would be lifeless without photosynthesis? Do you know how plants make their own food? Find answers to these and many such queries with our printable photosynthesis worksheets for students of grade 3 through grade 7. Featured here are vibrant charts illustrating the photosynthesis process, the equation of photosynthesis, precise and apt definitions of key terms in photosynthesis and activities like label the process, complete the paragraph, differentiate between light and dark reactions and much more. Our free photosynthesis worksheets are definitely worth a try!

Photosynthesis Basic Chart

This photosynthesis basic chart facilitates grasping and retaining the process of photosynthesis with ease. Equip children of grade 3 and grade 4 with this chart to familiarize them with the concept.

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Photosynthesis Equations Chart

The photosynthesis equation is presented in a visually appealing way in this chart. The word equation states the reactants - Co 2 and H 2 O and the products glucose and O 2 , followed by a balanced chemical equation.

Photosynthesis Equations Worksheet

Follow-up the equation chart with this complete the photosynthesis equations activity pdf, for children of grade 5 and grade 6 to reaffirm the concepts. Word equation and balanced chemical equations are included here.

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Photosynthesis Process | Descriptions

This printable handout illustrates the process of photosynthesis with concise descriptions. Comprehend the vital components involved and the products of photosynthesis with easy-to-understand descriptions.

Photosynthesis | Basic Vocabulary

This basic photosynthesis vocabulary worksheet simplifies the process of photosynthesis. The concept is broken into simple chunks for a vivid understanding of the terms and process involved in photosynthesis.

Photosynthesis | Advanced Vocabulary

Comprehend the process of photosynthesis with this vocabulary worksheet. Definitions of terms associated with the light and dark reactions of photosynthesis have been included here.

What is Photosynthesis?

Observe the photosynthesis process diagram presented in this printable 4th grade and 5th grade worksheet and plug in the words from the word box to complete the paragraph and answer the question "What is photosynthesis?".

Label the Photosynthesis Diagram

Help students transit from passive listeners to active participants with this labelling the photosynthesis process worksheet pdf. Direct the 3rd grade and 4th grade students to use the words from the word box to label the diagram.

Label the Reactants and Products of Photosynthesis

Refine the knowledge of students with this worksheet. They comprehend the major reactants and products and label them by recollecting the vocabulary words.

Describe the Reactants and Products

Brainstorm children of what they know and initiate discussions about each reactant and product with this worksheet. Instruct students to identify the reactants and products and describe them in a sentence.

Photosynthesis Process | Activity

Recapitulate the process of photosynthesis with this cut and paste activity worksheet pdf. Snip the reactants and products involved in the process of photosynthesis and glue them in the appropriate boxes.

Fill in the blanks

Test comprehension of 6th grade and 7th grade students with this fill in the blanks worksheet, that includes subtle details of the photosynthesis process. Read the sentences and plug the missing term(s).

Photosynthesis | Matching Activity

Employ this photosynthesis-matching-activity to assess the knowledge of students. Make one-to-one correspondence between the photosynthesis vocabulary words and their descriptions.

Structure of the Chloroplast | Chart

Develop an in-depth understanding of the process of photosynthesis with this printable chart. The labeled structure of the chloroplast chart indicates the exact location of the two processes within the leaf.

The Two Phases of Photosynthesis | Chart

The light-dependent and light-independent reactions of photosynthesis have been clearly illustrated in this chart. The reactants and products of each stage are labeled as well.

Label the Light and Dark Reactions

Actively involve students with this label-the-photosynthesis-reactions activity. Reiterate the Light reactions and the Calvin-Benson Cycle by labeling the two reactions along with their reactants and products.

Light Reaction Vs Dark Reaction

The differences between the light and dark reactions are stated vividly using a versatile graphic organizer, the T-chart. Integrate the T-chart to help students of grade 6 and grade 7 comprehend the differences between the light and dark reactions of photosynthesis.

Photosynthesis Review Questions

Posing questions is an effective teaching technique. The questions in this pdf worksheet are constructed to summarize the two stages in the process of photosynthesis and elicit responses in the form of definitions and comparisons.

The story of how humans and animals live is breathtaking. What's even more breathtaking is how plants get their energy on an everyday basis. Read this printable passage, and answer questions that ask you to eliminate the wrong title, write a short note and more.

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Home > Science Worksheets > Photosynthesis

Approximately 85% of the world's oxygen is due to this process. That is why if the sun were to suddenly stop producing light, not only would it be dark; we would not be able to breathe much longer. These worksheets explore all aspects of the process of photosynthesis. This collective series of worksheets helps students investigate this process and examine where it happens. We move on to understand the chemistry that takes place in this process and how we have used that knowledge to mimic the process and create our own energy artificially. We also spend a good amount of time understanding the organisms that can perform this much needed activity.

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What is It?

Plant respiration is the opposite of ours, since we breathe out carbon dioxide and plants breathe out oxygen.

What is It? Questions

Different kinds of plants need differing amounts of sunlight and water to thrive.

Photosynthesis and Cellular Respiration

Together, photosynthesis and cellular respirations are the basis of all life on Earth. The oxygen that is released by plants during photosynthesis is used by humans and almost all other organisms for our cellular respiration.

QUESTIONS: Photosynthesis and Cellular Respiration

Which process requires carbon dioxide and gives off oxygen?

Activities like eating and excretion are also part of the carbon cycle, as carbon is being taken into and passed back out of living organisms.

QUESTIONS: Carbon

When we burn these substances, the energy that plants once captured from the sun through photosynthesis is released back out into the atmosphere.

Artificial Photosynthesis

This technology, which is called direct solar water splitting, could also be adjusted in order to turn carbon dioxide back into fuel.

QUESTIONS: Artificial Photosynthesis

Why is producing hydrogen fuel currently hard on the environment?

Photosynthetic Organisms

Prokaryotic organisms are single-celled organisms that do not contain a nucleus.

QUESTIONS: Photosynthetic Organisms

Plants, algae, and cyanobacteria all use the Calvin cycle to fix carbon dioxide.

Anoxygenic Photosynthesis

In this process while sunlight is still used to fix carbon, during the reaction something other than water donates an electron.

QUESTIONS: Anoxygenic Photosynthesis

How is green nonsulfur bacteria different from green sulfur bacteria?

Chloroplasts

Only plants and photosynthetic organisms contain chloroplasts. Simple cells, like those of photosynthetic algae, may only contain several chloroplasts.

QUESTIONS: Chloroplasts

Where exactly within the chloroplast is chlorophyll located?

Light and Dark Reactions

In the first step, sunlight is captured by the chloroplasts when molecules of chlorophyll absorb energy (in the form of sunlight).

QUESTIONS: Light and Dark Reactions

What other methods are there for an organism to use CO 2 to make sugars?

Artificial Light

There are some key differences between sunlight and artificial light. Though artificial lights can mimic the full spectrum of natural light, the energy emitted by an artificial light in the red and blue spectrums does not have as much energy as the red and blue spectrums of natural sunlight.

QUESTIONS: Artificial Light

What kind of light was warm, indoor lighting contain a lot of?

Water and Heat

One of the characteristics of global warming is an increase of carbon dioxide in the air.

QUESTIONS: Water and Heat

How can prolonged stress from drought affect a plant?

How Photosynthesis Works

Photosynthesis is the primary source of oxygen in the Earth's atmosphere. As almost all living forms on the planet need oxygen, life would soon cease to exist without photosynthesis. 

Photosynthesis works through a process where plants (as well as algae and cyanobacteria) generate energy from sunlight, water, and carbon dioxide. Oxygen is then released into the atmosphere as a byproduct of the reaction.

All living things on the planet need energy in order to survive. Humans take their food in through their mouths as they eat all types of different things. Plants on the other hand get their energy from the light given off by the sun. Three things need to be present for a plant to be able to undergo photosynthesis this includes: carbon dioxide, sunlight, and water. Plants take the carbon dioxide in through little holes in their leaves called stomata. The plant absorbs water from the soil using roots and gets that water to the rest of the body. As the sunlight passes through the leaves of the plants it travels through ton of chloroplasts found within the leaf. Within those chloroplasts the water molecules are split into hydrogen and oxygen. The oxygen leaves the leaf and the remaining hydrogen and carbon dioxide are used to form glucose which is a usable form of energy for the plant.

The Mechanism of Photosynthesis

As mentioned, the three components essential for photosynthesis are sunlight, carbon dioxide, and water. Together, they transform light energy into chemical energy.

Plants convert solar energy into chemical energy that life forms can use. They also form the basis of the food chain, passing that energy to other species. The beauty of photosynthesis is that oxygen is released as a byproduct of the reaction, filling the atmosphere with the gas all living forms depend on. If you come to think about it, photosynthesis is probably the most important biological process of all.

However, it is important to note that while plants consume carbon dioxide and release oxygen during photosynthesis, they also have respiratory processes during which they do the opposite. About half the amount of carbon dioxide plants consume is released by them as a result of cellular respiration.

Light-Dependent Reactions

Light-dependent reactions happen during the day, as they require a constant supply of light.

Sunlight is absorbed by chlorophyll that is contained in chloroplasts. Chloroplasts are organelles contained in the leaves, and chlorophyll is a ferment that absorbs the energy from red and blue light waves. Chlorophyll also makes plants appear green, as it reflects green light.

Then, the light energy is converted into chemical energy. To perform this stage, plants need water. The light energy is used to start a reaction and split the water molecule, which allows releasing chemical energy in the form of Adenosine Triphosphate (ATP) and Nicotinamide Adenine Dinucleotide Phosphate (NADPH) molecules. While H (hydrogen) later becomes a part of a glucose molecule, O2 (oxygen) is released into the atmosphere as a byproduct.

Light-Independent Reactions

Light independent reactions do not require light streams and thus happen during the night. This stage is also known as the Calvin Cycle .

Carbon dioxide enters the pores called stomata which are usually located at the bottom of a leaf. Then, carbon dioxide molecules are diffused into the stroma, the protein-containing matrix between the thylakoid membranes and the chloroplast membranes.

Stroma is where the rest of the process happens. The chemical energy released during the previous stage in the forms of ATP and NADPH is used to extract carbon from carbon dioxide and later form a glucose molecule. It requires six molecules of carbon dioxide, and therefore six turns of the cycle, to create one molecule of glucose.

A Short Summary of Photosynthesis

Here's a brief overview of the steps involved in photosynthesis to help you quickly grasp how the process works.

• Light is absorbed by chlorophyll, a ferment contained in leaves.
• Light energy is converted into chemical energy: light energy is used to split a water molecule. The reaction releases chemical energy.
• Oxygen is released into the atmosphere as a byproduct of the reaction.
• Carbon dioxide enters through pores called stomata and is moved into a stroma.
• In the stroma, previously released chemical energy is used to extract carbon from carbon dioxide. Carbon is then used to form a glucose molecule (sugar).

While oxygen is produced as a result of photosynthesis, the primary function of the process for plants is producing energy in the form of sugars. Oxygen is only a byproduct that gets released into the atmosphere. Still, photosynthesis is not only the basic source of energy for all living creatures but also the primary source of oxygen in our atmosphere.

PHOTOSYNTHESIS

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Photosynthesis

Grade 7 science worksheets.

Every topic or lesson that a tutor teaches has an objective of making the students understand concepts related to the topic. For this, they need assessment tools which allow tutors to measure how well a student has assimilated the theory taught. One of the most basic tools is worksheets.

These worksheets on  “Photosynthesis”  can help both tutors and students alike to review the lesson, get a feedback and eventually improve their respective performances.

Considering the importance of this topic and its significance in learning higher levels of science in the future, it is important that students understand the process and concept of  ‘Photosynthesis’  well.

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Photosynthesis  is the process by which light energy is tapped and changed into chemical energy in the form of the food sugar. Carbon dioxide is taken in by the plants and oxygen is given out.

Sunlight + carbon dioxide + water = sugar + oxygen

 Carbon dioxide and water are combined and their atoms bonds to form a sugar molecule. The bonds of the sugar molecule store the energy gained from light.

The following is the chemical reaction for photosynthesis:

Where does photosynthesis occur?

Photosynthesis is carried out by chloroplasts within the cells of plants. Chloroplasts contain chlorophyll (green color). Chlorophyll absorbs sun’s energy that is sunlight. The photons in light (i.e., the light particles) hit with the electrons in the chlorophyll, which transforms the energy.

A group of bacteria called cyan is originally the chloroplast. This is one of the examples of symbiosis. Here, the cyan bacteria were passed onto upon the host cells as eukaryotic host cells millions of years ago and the method of photosynthesis began. Not only are these ancient symbionts, cyan bacteria which are spread all over the plant in the oceans (three-fourth of the earth’s surface) are responsible for most of the photosynthesis occurring on Earth today.

(Note: A eukaryote is an organism with complex cells, or a single cell which has a complex structure.  These cells have the genetic material in the chromosomes in the nucleus of the cell.)

Photosynthesis and the properties of energy

In photosynthesis, light energy is converted to chemical energy and stored in the form of food sugars. The law of conservation of energy is followed that is the  amount of light that energy input equals the amount of chemical energy that is the output.

  Photosynthesis requires CO2+ Water H2O and sunlight. The processes by which plants and some other organisms like algae capture light energy and use it to make food from carbon dioxide and water.  

Chemical equation for Photosynthesis

Glucose is a type of sugar that provides us with energy .

Glucose is needed by all forms of life to produce energy.  It is an essential part of the stored food.

The process by which glucose is broken down is called respiration –

During respiration, the chemical energy stored in glucose is converted into other forms of energy, such as mechanical energy or thermal energy.

Plants use some of this energy to grow, reproduce , and perform other life functions. Unused energy is stored as food by the plants.

Plants go through both photosynthesis and respiration.

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Sample Questions

Q1. The process of making food in plants is called

a) Respiration b) Transpiration c) Photosynthesis

Q2. Suzanne is sitting on a garden bench surrounded with lot of plants. Which of these gases is Suzanne likely to inhale the most?

a) Nitrogen b) Carbon dioxide c) Oxygen d) None of the above

Q3. Photosynthesis is the process which takes place in

i) Mitochondria ii) Chloroplast iii) Ribosome

Q4. Life without Photosynthesis would not be possible.

i) True ii) False

Q5. The tubes that bring water from the roots to the leaves are called

i) Xylem ii) Phloem

Q6. Fill in the blanks

i) In photosynthesis, _______________ is changed into chemical energy. ii) The first step in Photosynthesis is _______________ of Sunlight. iii) Products of Photosynthesis  are _______________  and _______________

iv ) Identify this Organelle. It is found only in the Plant Cell. Label the parts as – Grana, Stroma and single Thylakoid _______________

Check Point

I. Fill in the blanks –  

• Photosynthesis refers to the process by which …………… …………… is tapped and transformed into chemical energy in the form of the ………… ………….
• The bonds within the sugar molecule store the energy obtained from ……………
• Chloroplasts contain ………………….., a lipid that gives plants their …………….. Color.
• The chloroplast is actually derived from a group of bacteria known as………. bacteria.
• The process by which …………… is broken down is called respiration.

II.  State True or False –

• Oxygen from water is released as a by-product in this process of photosynthesis.
• light energy + 6CO 2 + 6H 2 O -> C 6 H 12 O 6 + 6O 2
• Photosynthesis is carried out by chromoplasts within the cells of plants.
• The photons in light collide with the neutrons in the chlorophyll molecule, which starts the process of energy transformation.
• Plants only go through photosynthesis.

I.Fill in the blanks –  

• Light energy, food sugar
• Chlorophyll, green

II.True or False –

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Photosynthesis

Photosynthesis introduces students to the process by which plants make food. Students will learn the steps of this process and discover that the air they breathe is a direct result of photosynthesis.

There are several suggestions in the “Options for Lesson” section that you may want to use for your class. For instance, you can use the homework and practice worksheets as quizzes if you want to. You could also take students outside as you deliver the lesson. As another alternative or additional activity, you may choose to have students grow their own plants.

Description

Additional information, what our photosynthesis lesson plan includes.

Lesson Objectives and Overview: Photosynthesis explores this amazing natural process and provides students with a basic foundation of understanding. Students will be able to define photosynthesis and explain that this process is how plants make their food. They will also recognize that, through this same process, plants convert carbon dioxide into oxygen. This lesson is for students in 1st grade and 2nd grade.

Classroom Procedure

Every lesson plan provides you with a classroom procedure page that outlines a step-by-step guide to follow. You do not have to follow the guide exactly. The guide helps you organize the lesson and details when to hand out worksheets. It also lists information in the yellow box that you might find useful. You will find the lesson objectives, state standards, and number of class sessions the lesson should take to complete in this area. In addition, it describes the supplies you will need as well as what and how you need to prepare beforehand. The supplies you need for this lesson include colored pencils, markers, or crayons. To prepare, you will need to get a small plant and small pieces of candy, veggies, and so on.

Options for Lesson

You will find several suggestions in the “Options for Lesson” section for additional activities or alternative ideas for the lesson. One option is to use the homework or practice worksheet as a quiz. Another idea is to take students outside for the lesson and choose a plant or tree as the focus of the lesson. It could be a good idea to combine this lesson with the lesson about the food chain. You could also extend the lesson and allow students to grow their own small plants and record the plants’ growth throughout the course of a week. If your students are older, you could have them write stories from the perspective of a plant about the process of photosynthesis.

Teacher Notes

The teacher notes page provides an additional paragraph of guidance or ideas. It suggests focusing on what this process does for plants and humans and not on the possibly tricky key terms. It also mentions that this is an intro lesson and students will learn more about the process in later grades. Use the blank lines to write down whatever ideas or thoughts you have before the lesson.

PHOTOSYNTHESIS LESSON PLAN CONTENT PAGES

How plants make food.

The Photosynthesis lesson plan contains two pages of instructional content. The lesson first describes the process of photosynthesis step by step. Plants take in sunlight as energy, as well as carbon dioxide, through both its leaves and other green parts. Then the plants make oxygen and release it into the air. Students will discover that a chemical inside the plant called chlorophyll traps the sun’s energy. And the chloroplasts inside of that chemical combine everything to create food for the plant in the form of sugar.

A diagram on the first page displays a picture of a sunflower and labels the different components of the photosynthesis process. An arrow leads from the sun and points to the sunflower’s leaves. It shows a carbon dioxide molecule with an arrow pointing to the leaves as well. A little splash of water has an arrow pointing to the roots beneath the soil. Those are all the components that enter the plant.

The outputs include oxygen and sugar. An arrow points from the sunflower’s leaves to an oxygen molecule. Another arrow points to cubes of sugar. The sugar is not actually outside of the plant. However, the diagram is showing the inputs and outputs of various components. You may need to explain to students that the sugar remains inside the plant.

What Happens Next

Since plants are living organisms just like animals, they need food and energy to survive. Animals can eat their food, including plants, with their mouths. Plants, however, don’t have mouths and cannot eat the same way that animals do. The process of photosynthesis exists so that plants can eat and survive too. Once a plant finishes making its food, its stem helps send the food, as well as nutrients, throughout the rest of the plant.

Without plants and their ability to make their own food through photosynthesis, all other living things could not possibly survive. For one thing, people and animals eat plants as their own source of food. But the oxygen that plants release is essential to the survival of living things. In addition, plants provide us with the energy that they’ve absorbed from the sun when we consume them. Students will discover that fruits and vegetables actually contain the most energy.

PHOTOSYNTHESIS LESSON PLAN WORKSHEETS

The Photosynthesis lesson plan includes three worksheets: an activity worksheet, a practice worksheet, and a homework assignment. The goal is for students to approach the subject matter in different ways to solidify their grasp of the content they learned. You can look at the guidelines on the classroom procedure page to know when to hand out each worksheet.

COLOR THE FIGURES ACTIVITY

The activity worksheet provides students the opportunity to color in a blank picture that represents the process of photosynthesis. There are already labels on the figure, but students will color each step of the process. If you want, you can make it a puzzle and cut out the pieces in advance. After students color the elements, have them put them in order on another piece of paper.

FILL IN THE BLANKS PRACTICE WORKSHEET

For the practice worksheet, students will read through four short paragraphs. Each paragraph has missing terms and contains a separate word bank of five terms. Students will fill in the blanks using the correct terms for each paragraph.

PHOTOSYNTHESIS HOMEWORK ASSIGNMENT

The homework assignment is essentially the opposite of the activity. The worksheet provides a colorful picture that represents photosynthesis. There are sentences around each part of the picture where a label belongs. Students must fill in the blanks in these sentences with the correct labels, such as water, oxygen, or light.

Worksheet Answer Keys

The pages at the end of the lesson are answer keys for the practice worksheet and homework assignment. The practice answer key shows the correct answers in red ink. The answer key for the homework assignment provides the diagram with the correct terms in red. It also has a list of the statements from the diagram on a separate page to make it easier to keep track of. If you choose to administer the lesson pages to your students via PDF, you will need to save a new file that omits these pages. Otherwise, you can simply print out the applicable pages and keep these as reference for yourself when grading assignments.

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Photosynthesis for Elementary Students

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Photosynthesis

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Sunlight + water + CO2 = plant food

Photosynthesis is the process by which plants turn sunlight, water and carbon dioxide into food for themselves; remember to point out to students that photosynthesis also produces the oxygen that we breathe .

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