photosynthesis worksheet 7th grade answers

PHOTOSYNTHESIS

This tests the basi characteristics of photosynthesis

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Solubility is the ability of a substance to dissolve in a solvent. The solvent can be a liquid , solid , or gas . The substance that is being dissolved is called the solute, and the solvent is the substance that dissolves the solute. The amount of solute that can be dissolved in a solvent at a specific temperature is known as the solubility of the substance.

Factors Affecting Solubility

The solubility of a substance can be affected by several factors:

• Temperature : In general, the solubility of most solid solutes increases as the temperature of the solvent increases. However, for some gases , solubility decreases as temperature increases.
• Pressure : The solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid . This means that as the pressure of the gas increases, its solubility in the liquid also increases.
• Nature of the solute and solvent: The chemical nature of the solute and solvent can also affect solubility. For example, polar solutes tend to dissolve in polar solvents, while nonpolar solutes dissolve in nonpolar solvents.

Units of Solubility

The solubility of a substance is usually expressed in terms of the amount of solute that can be dissolved in a given amount of solvent. Common units of solubility include grams per 100 milliliters (g/100 mL) or grams per liter (g/L) for solids , and moles per liter (mol/L) for gases .

How to Determine Solubility

There are several methods for determining the solubility of a substance, including:

• Using a solubility chart or table that lists the solubility of different substances in various solvents at different temperatures .
• Conducting a solubility experiment in the laboratory, where the solute is added to a solvent and the amount of solute that dissolves is measured.
• Using mathematical models and equations to predict solubility based on the properties of the solute and solvent.

Applications of Solubility

Solubility has important applications in various fields, including:

• Chemistry : Solubility plays a crucial role in chemical reactions , as it determines the amount of reactants that can come into contact with each other in a solution.
• Pharmacy and medicine : The solubility of drugs in different solvents is important for formulating medications and determining their effectiveness.
• Environmental science: Understanding the solubility of pollutants in water is essential for evaluating their impact on the environment and developing remediation strategies.

Study Guide

Here are some key points to remember about solubility:

• Define solubility and distinguish between solute and solvent.
• Understand the factors that affect solubility, including temperature , pressure , and the nature of the solute and solvent.
• Be familiar with the units of solubility and how to express solubility in different units.
• Know the methods for determining solubility, such as using solubility charts, conducting experiments , and using mathematical models.
• Recognize the applications of solubility in different scientific and practical contexts.

Understanding solubility is important for various scientific disciplines and has practical implications in everyday life . By mastering the concept of solubility, you can gain a deeper understanding of chemical processes and their impact on the world around us.

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5 Free Photosynthesis Worksheets for Middle and High School

Learn and review with unique activities including a maze, scavenger hunt, and more.

For even more free science ideas and printables, head to our science hub! You’ll find resources in every science subject for middle and high school.

Teaching photosynthesis this year? You’re in the right place! Five fantastic photosynthesis worksheets are ready to help your students learn and review this essential topic. There are activities for both middle and high school classrooms along with a teacher’s guide and answer key. You can say “So long!” to searching for unique and engaging activities for your photosynthesis lessons.

Check out the photosynthesis worksheets included:

Diagram and reading passage with questions.

Introduce your students to an overview of photosynthesis with a diagram they will label. Then, use the provided reading passage to have students read, highlight, or annotate the section to become more familiar with the photosynthesis process. The corresponding questions will test their understanding. Plus, both the diagram and reading questions can serve as awesome review tools before test time!

We’re loving this unique and fun activity! Students will start in the top left and answer each question in the green boxes. Once they select the correct answer, they’ll shade in that pathway to lead them to the next question to work on.

Scavenger Hunt

Get students moving! Cut out the question cards and place them around the room. Students can start at any station and use their answer sheet to write out any work and their answer. Based on the answer they gave, they’ll find the next station to go to.

Cut and Paste

Ask students to cut out the answer cards and they’ll work to match them in the correct space within the chart. Once their answers are finalized, they can paste them in! You can even ask students to color-code or draw a diagram on the answer cards to help them remember.

High school biology teacher Lacey VanBuskirk helped us create these amazing photosynthesis worksheets.

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Photosynthesis - Worksheet with Answers

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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.

• Download the Chart

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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Free Printable photosynthesis worksheets

Discover the fascinating process of photosynthesis with our free printable Science worksheets, designed to help Science teachers educate and inspire students in their exploration of plant life and energy conversion.

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Photosynthesis worksheets are an essential tool for teachers to help students understand the complex process of photosynthesis in an engaging and interactive manner. These worksheets, designed for various grade levels, provide a comprehensive and in-depth understanding of the fundamental concepts of photosynthesis, which is a crucial topic in Science and Biology curriculums. Teachers can use these worksheets to explain the process of converting light energy into chemical energy, the role of chlorophyll, and the importance of photosynthesis for all living organisms. By incorporating these photosynthesis worksheets into their lesson plans, teachers can ensure that their students grasp the key concepts and develop a strong foundation in Science and Biology.

Quizizz is a fantastic platform that offers a wide range of resources, including photosynthesis worksheets, to help teachers create engaging and interactive learning experiences for their students. In addition to worksheets, Quizizz also provides various other offerings such as quizzes, flashcards, and interactive games that cater to different learning styles and preferences. Teachers can easily integrate these resources into their Science and Biology lessons to reinforce the concepts taught in class and assess their students' understanding of the subject matter. By utilizing Quizizz's extensive collection of high-quality, grade-specific resources, teachers can create a dynamic and enriching learning environment that fosters a deep understanding of photosynthesis and other essential topics in Science and Biology.

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

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Photosynthesis and Respiration

Class 7 - concise biology selina, multiple choice questions.

Carbohydrates are stored by plants in the form of:

Reason — Glucose is formed in leaves very rapidly during the photosynthesis and it cannot be transported to other parts with the same rapidity. So, several molecules of glucose join together to form insoluble starch for temporary storage.

Stomata are present on the surface of:

• Flower petals

Reason — Stomata are present on the surface of leaves to facilitate exchange of gases between the leaf and the atmosphere.

Which one of the following is the immediate end-product of photosynthesis?

Reason — Fructose, Cellulose and lactose are polymers of glucose.

Short Answer Questions

Why do leaves generally look green?

Leaves generally look green because of the presence of chlorophyll, a pigment that imparts green colour to leaves.

Which four of the following are needed for photosynthesis in a leaf?

• Carbon dioxide
• Chlorophyll

Following are the four things which are needed for photosynthesis in a leaf:

What is the source of energy for photosynthesis?

The source of energy for photosynthesis is Sunlight.

Which gas is taken in and which one is given out by a green leaf in bright sunlight?

(i) Taken in: ............... (ii) Given out: ...............

(i) Taken in: Carbon dioxide (ii) Given out: Oxygen

Suppose we compare the leaf with a factory, match the items in Column A with those in Column B.

State whether the following statements are True or False:

(i) Green plants prepare their food by using two raw materials, oxygen and water.

(ii) The chlorophyll enables the plants to use light energy.

(iii) The free oxygen in the atmospheric air is the result of photosynthesis.

(iv) Photosynthesis occurs only in chlorophyll-containing parts of the plant.

(i) False Corrected Statement — Green plants prepare their food by using two raw materials; Carbon dioxide and water.

Differentiate between aerobic and anaerobic respiration. Write the overall chemical equations of the two kinds of respiration in plants.

(i) Aerobic: ...............

(ii) Anaerobic: ...............

Chemical equations of the two kinds of respiration in plants are:

(i) Aerobic:

Glucose + Oxygen → Enzymes \xrightarrow{\text{Enzymes}} Enzymes ​ Carbon dioxide + water + Energy (38 ATP)

(ii) Anaerobic:

Glucose → Enzymes \xrightarrow{\text{Enzymes}} Enzymes ​ Ethanol + Carbon dioxide + Energy (2 ATP)

Explain how photosynthesis is different from respiration.

The differences between Photosynthesis and Respiration are explained below:

Do the plants respire all day and night or only during the day? Give reasons.

Plants respire all day and night as plants require a constant supply of energy for all the different processes that go on inside the cells of the plant body. Energy is required for the growth of the plant, for root cells to penetrate the soil and absorb water and minerals and so many other such activities. Thus, Respiration occurs continuously in plants, during both day and night.

Question 10

What happens to the energy liberated during respiration?

The energy liberated during respiration is utilized for all the different processes that go on inside the cells of the plant body. Energy is required for the growth of the plant, for root cells to penetrate the soil and absorb water and minerals.

Long Answer Questions

In order to carry out photosynthesis, what are the substances that a plant must take in? Also mention their sources.

In order to carry out photosynthesis, the substances that a plant must take in are Carbon dioxide and Water. Photosynthesis also require the presence of Chlorophyll and Sunlight.

Following are their sources:

• Carbon dioxide — Atmosphere
• Water — Soil
• Sunlight — Sun
• Chlorophyll — contained in the leaves.

What is the role of chlorophyll in photosynthesis?

Chlorophyll is found in mesophyll cells of leaf, inside the plastids called chloroplast. Chlorophyll is very important as it absorbs the sunlight which provides energy for the process of photosynthesis. This energy is used to split water molecules (H 2 O) into hydrogen ions (H + ) and hydroxyl ions (OH - ). Oxygen from the hydroxyl ion is released into the air and hydrogen ions combine with carbon dioxide to form glucose.

Do plants need oxygen? If so, what is its source?

Plants need oxygen for respiration. The source of oxygen is atmosphere.

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