NCERT Solutions for Class 7 Science Chapter 10 - Life Processes in Plants

The NCERT Solutions for Class 7 Science Chapter 10 Life Processes in Plants help students in understanding how plants perform basic life activities such as food production, the transportation of water and nutrients, and respiration. The solutions of this chapter describe very easily that plants produce their food via photosynthesis, which is a process by which leaves use sunlight, water, carbon dioxide, and chlorophyll to produce glucose and oxygen. Leaves are referred to as the "food factories" of plants since most of this process takes place there. NCERT Solutions will help students in preparing well for board exams well as it provides well written answers to all questions of the chapter.

This Story also Contains

1. NCERT Solutions for Class 7 Science Chapter 10 Life Processes in Plants (Exercise Questions)
2. Approach to Solve Questions of Class 10 Control and Coordination
3. Important Topics from Class 7 Chapter 10: Life Processes in Plants
4. Important Question from Class 7 Science Chapter 10
5. NCERT Solutions for Class 7 Science Chapter-Wise

The NCERT Solutions for Class 7 of the chapter “Life Processes in Plants” also discuss how minerals and water are absorbed by the roots and transported to the leaves via special tubes known as xylem, whereas the food produced in the leaves is carried to the rest of the plant by phloem. Small pores on the leaves known as stomata help plants to exchange gases with the atmosphere and also release water in the form of transpiration. Plants also convert glucose to release energy in respiration. The NCERT Solutions for Class 7 Science are easy for the students to learn and remember, which aids them in preparing well for their board exams as well as other competitive exams.

NCERT Solutions for Class 7 Science Chapter 10 Life Processes in Plants (Exercise Questions)

The solved exercise questions are given below-

Question 1: Complete the following table

Answer:

The completed table is given below:

Question 2: Imagine a situation where all the organisms that carry out photosynthesis on the Earth have disappeared. What would be the impact of this on living organisms?

Answer: If photosynthesising organisms disappear, there will be no food and oxygen for animals and humans. Plants make food and oxygen through photosynthesis, which supports all life on Earth. Without it, animals and humans would starve and have no air to breathe. The balance of oxygen and carbon dioxide in nature would break, leading to the extinction of almost all living organisms.

Question 3: A potato slice shows the presence of starch with iodine solution. Where does the starch in potatoes come from? Where is the food synthesised in the plant, and how does it reach the potato?

Answer: Starch in potatoes comes from the food prepared in the leaves. Leaves make glucose by photosynthesis, which is carried through phloem tubes to different parts of the plant. This food reaches the underground stem, the potato, where it is stored in the form of starch. The iodine test turns blue-black because of the presence of this starch inside the potato cells.

Question 4: Does the broad and flat structure of leaves make plants more efficient for photosynthesis? Justify your answer.

Answer: Yes, broad and flat leaves help plants capture more sunlight. A bigger surface area means the leaf can absorb more sunlight and carbon dioxide, both of which are needed for photosynthesis. More light and air allow the plant to make more food quickly. This helps the plant grow better and stay healthy. So, such a structure makes the process of photosynthesis more efficient.

Question 5: X is broken down using Y to release carbon dioxide, Z, and energy.
X + Y Carbon dioxide + Z + Energy
X, Y, and Z are three different components of the process. What do X, Y, and Z stand for?

Answer: In the equation:
X = Glucose, Y = Oxygen, Z = Water
The process shown is respiration. During respiration, glucose is broken down with the help of oxygen to release carbon dioxide, water, and energy. This energy is used by the plant for growth and other activities. This shows how plants get energy from the food they make through photosynthesis.

Question 6: Krishna set up an experiment with two potted plants of the same size and placed one of them in sunlight and the other in a dark room, as shown in Fig. 10.10.
Answer the following questions —
(i) What idea might she be testing through this experiment?
(ii) What are the visible differences in plants in both conditions?
(iii) According to you, leaves of which plants confirm the iodine test for the presence of starch?

Answer:

(i) Krishna is testing whether sunlight is needed for photosynthesis.
(ii) The plant in sunlight will look green and healthy, while the plant in the dark will look weak and pale.
(iii) The leaves of the plant kept in sunlight will turn blue-black with iodine, showing that starch is made. The dark-room plant will not show starch.

Question 7: Vani believes that ‘carbon dioxide is essential for photosynthesis’. She puts an experimental set-up, as shown in Fig. 10.11, to collect evidence to support or reject her idea.
Answer the following questions —
(i) In which plant(s) in the above set-up(s) will starch be formed?
(ii) In which plant(s) in the above set-up(s) will starch not be formed?
(iii) In which plant(s) in the above set-up(s) will oxygen be generated?
(iv) In which plant(s) in the above set-up(s) will oxygen not be generated?

Answer:

(i) Starch will be formed in the plant kept in sunlight with carbon dioxide.
(ii) It will not be formed in plants without sunlight or carbon dioxide.
(iii) Oxygen will be produced in the plant exposed to both sunlight and carbon dioxide.
(iv) Oxygen will not be made in plants without light or carbon dioxide. This proves carbon dioxide is needed for photosynthesis.

Question 8: Ananya took four test tubes and filled three-fourths of each test tube with water. What do you think she wants to find out? How will she know if she is correct?

Answer: Ananya wants to find out how plants and animals change the amount of carbon dioxide in water. If only the snail is present, carbon dioxide increases. If the plant is present, it uses the carbon dioxide. She will check the colour change of the indicator to know if carbon dioxide was added or removed in each test tube. This helps her understand gas exchange.

Question 9: Design an experiment to observe if water transportation in plants is quicker in warm or cold conditions.

Answer: Take two plants of the same size. Place one in a warm place and the other in a cool place. Add coloured water to both pots. After some time, cut the stem and see how far the colour has moved up. The plant in the warm place will show more colour, which means water moves faster in warm conditions. This proves that temperature affects water transport.

Question 10: Photosynthesis and respiration are essential to maintain balance in nature. Discuss.

Answer: Photosynthesis and respiration keep nature in balance. Plants take in carbon dioxide and give out oxygen during photosynthesis. Animals and humans use this oxygen and give out carbon dioxide during respiration. The carbon dioxide is again used by plants. This cycle helps keep the right amount of gases in the air and provides food and energy for all living things to survive.

Also Read:

• NCERT Solutions for Class 7 Maths

Approach to Solve Questions of Class 10 Control and Coordination

Understand the concepts of control and coordination thoroughly and apply them logically to answer questions effectively.

1. Begin by revising key concepts, such as the nervous system, hormones, and their roles in maintaining bodily coordination.

2. Give extra attention to diagrams and processes such as reflex action and the endocrine system, since they are frequently examined.

3. Read each question with care to determine if it is either about the nervous system or hormonal control.

4. Use simple and precise language while describing mechanisms, and provide relevant examples or diagrams as support if needed.

5. Practice sample papers and previous years' questions to increase confidence and accuracy in solving control and coordination questions

Also, check the NCERT Books and the NCERT Syllabus here:

• NCERT Books Class 7 Science
• NCERT Syllabus Class 7 Science
• NCERT Books Class 7
• NCERT Syllabus Class 7

Important Topics from Class 7 Chapter 10: Life Processes in Plants

Some of the important topics covered in the chapter help us understand how plants make their own food, breathe, and move water and nutrients, which is essential for their survival and for supporting all life on Earth.

• Photosynthesis

• Role of Leaves

• Stomata

• Transport of Water & Minerals

• Transport of Food

• Respiration in Plants

• Importance of Sunlight

Important Question from Class 7 Science Chapter 10

The chapter "Life Processes in Plants," explains how plants make their food through photosynthesis, the importance of water and minerals, and the role of structures like stomata, xylem, and phloem in plant life. Understanding photosynthesis and how plants transport water and food is central to this chapter.

Question: Which structure in plant leaves is mainly responsible for the exchange of gases during photosynthesis?

a) Xylem
b) Phloem
c) Stomata
d) Cuticle

Answer: c) Stomata

Explanation:
Stomata are tiny pores found mostly on the underside of leaves. They play a crucial role in the exchange of gases, allowing carbon dioxide to enter the leaf and oxygen to exit during photosynthesis. Stomata also help in transpiration, which is the loss of water vapour from the plant. The opening and closing of stomata are vital for maintaining the plant’s water balance and enabling efficient photosynthesis.

NCERT Solutions for Class 7 Science Chapter-Wise

The chapterwise solutions are given below: