Life Processes in Plants Class 7 Extra Questions and Answers Science Chapter 10

Students can use Class 7 Science Curiosity Extra Questions and Chapter 10 Life Processes in Plants Extra Question Answer to prepare effectively at home.

Class 7 Science Chapter 10 Life Processes in Plants Extra Questions

Class 7 Science Chapter 10 Extra Questions on Life Processes in Plants

Life Processes in Plants Class 7 Very Short Question Answer

Question 1.
What factors are essential for photosynthesis to take place?
Answer:
CO₂, sunlight, chlorophyll and water.

Question 2.
Why do plants need food?
Answer:
For growth and development.

Question 3.
Define photosynthesis in short words.
Answer:
Green plants → use CO₂ and water → to form glucose in presence of sunlight and chlorophyll too.

Question 4.
What food factories of a plant?
Answer:
Leaves (Green).

Question 5.
Name a chemical used to test the presence of starch in leaves.
Answer:
Iodine solution.

Question 6.
What transports H₂O and minerals from roots?
Answer:
Xylem

Question 7.
What do plants use in respiration?
Answer:
Oxygen and food.

Question 8.
What is function of caustic soda?
Answer:
It absorbs CO₂.

Question 9.
From where do we get food?
Answer:
From eating plants.

Question 10.
Plants store food in what form?
Answer:
In form of starch.

Question 11.
What are nutrients?
Answer:
The components of food that are necessary for our body are called nutrients.

Question 12.
What are stomata?
Answer:
Tiny pores present on the lower surface of the leaves that helps in exchange of gases are called stomata.

Question 13.
Whether food is made in all parts of a plant or only in certain parts?
Answer:
The food is made mainly in leaves and some other parts of the plants that contain chlorophyll.

Question 14.
What are the food factories of plants?
Answer:
Leaves are the food factories of plants.

Question 15.
Name the process by which plants prepare their own food.
Answer:
Photosynthesis

Question 16.
Name the pigment that makes leaves green.
Answer:
Chlorophyll

Question 17.
What is the function of chlorophyll?
Answer:
Chlorophyll captures the energy of sunlight.

Question 18.
What are the end products of photosynthesis?
Answer:
Glucose and oxygen

Question 19.
Name the gas used in photosynthesis.
Answer:
Carbon dioxide

Question 20.
Name the gas released in photosynthesis.
Answer:
Oxygen

Life Processes in Plants Class 7 Short Question Answer

Question 1.
What roles are played by CO₂ and O₂ gases in photosynthesis and respiration?
Answer:
Green plants use CO₂ and water in phototsynthesis to prepare food (glucose). This happens in presence of sunlight. On the contrary, plants respire by using oxygen to release CO₂ in it.

Question 2.
What are stomata? Where these occur? (V. Imp.)
Answer:
Stomata are tiny pore found in leaf surface (upper and lower also). They are meant for exchange of gases CO₂ and O₂ both in and out.

Question 3.
How do absorbtion of H₂O and minerals occur in plants?
Answer:
There are thin tubes present in stem, branch and leaves of plants. Minerals dissolved in water are transported to stem by xylem tissue.

Question 4.
What happens to food prepared by plants
Answer:
Plants prepare food by process of photosynthesis. Food prepared by plants is transported to all parts of a plant. Moreover, it occurs by tubeshaped structures called phloem. Transported food may also store in some plant parts like stem, leaf, root, seeds etc.

Question 5.
Write how do the plants respire? (Imp.)
Answer:
The plants taken in oxygen. They release carbon dioxide in turn of this. The food is broken down in presence of oxygen. The energy is released for plant growth and development. All parts of a plant do respire whether they are green or non-green. The word equation of respiration as:
Oxygen + Glucose → Water + Carbon dioxide + Energy ↑

Question 6.
What are contributions of R.H. Dastur about photosynthesis?
Answer:
Following are contributions of R.H. Dastur about photosynthesis:

Studied process of photosynthesis at all.
Served as Head of Botany at Royal Institute of Science in Bombay.
Study on effects of water amount as well as the temperature in photosynthesis.
Thoroughly examined the importance of temperature, water as well as colour of light in photosynthesis.

Question 7.
Explain process of photosynthesis in a nutshell.
Answer:
In a nutshell: Photosynthesis is a process of food formation in which carbon dioxide, water are taken by green leaves of a plant in sunlight and oxygen is released in air.
Carbohydrate (glucose) is formed in it. That serve as in start source of energy to plants. Glucose is changed to starch to be stored in leaves of a plant.

Question 8.
What is the role of air in preparation of food in plants? (Imp.)
Answer:
Air plays a main role in formation of food by plants. From air CO₂ and the water are taken to form food. Carbon dioxide present in air is necessary to prepare food by leaves. Water from air is used to prepare food by green plants. It occurs in sunlight. So plants take substance needed for photosynthesis, from their sorroundings. They also release oxygen for respiration.

Question 9.
Give an account of a woman scientist of India.
Answer:
A woman scientist of India. Kamala Sohonie (1911 to 1998)

Contribution in area of respiration in the plants.
She worked at Lady Harding Medical College, New Delhi.
Worked at N.R.L. Coonoor.
Remain Director of Royal Institute, Bombay now (Mumbai)
Improvement in Nutritional value of plant foods.
Work on sap of coconut palm (Neera a Nutrition drink to us)

Question 10.
Compare respiration to photosynthesis.
Answer:

Photosynthesis	Respiration
1. CO₂ is taken in.	1. CO₂ is given out in it.
2. O₂ is given out.	2. O₂ is taken in.
3. Foods is formed in this process.	3. Food is broken down in it.
4. Oxygen is released in the process of photosynthesis at all.	4. Energy is released during respiration at all.

Question 11.
Mention the roles of xylem and phloem.
Answer:
Xylem: These are tube like structures found in stem, branches, leaves. The minerals dissolved in water transported to stem by xylem.
Phloem: Food prepared by leaves is transported through phloem. It goes to all parts of body. The transported food can be stored in certain parts of plant like roots stems (potato) and seeds etc. Phloem transports glucose made in leaves to other parts of plant body.

Question 12.
How would you test for starch in a leaf? Explain. (V. Imp.)
Answer:
For test of starch in leaf we put a leaf in boiling water for 10 minutes for softening etc. Then dipped into a test tube that has alcohol in it. Then keep this test tube in boiling water until the leaf becomes colourless. Then take out leaf and put drops of iodine solution on it by a dropper. After minutes you may see that colour of leaf is changed to blue-black. It indicates the presence of starch in leaf.

Question 13.
A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?
Answer:
During the process of photosynthesis, the plant takes water, carbon dioxide, and essential nutrients from the surroundings, converts them to energy or carbohydrates, and stores them. The plant managed to survive in the absence of leaves due to the energy stored in the plant in the form of starch.

Question 14.
How do plants obtain the raw materials for photosynthesis from the surroundings?
Answer:
Plants obtain the raw materials for photosynthesis from their surroundings in different ways. They absorb water through their roots from the soil, take in carbon dioxide from the air through stomata, and capture sunlight using the chlorophyll in their leaves.

Question 15.
Give a brief description of the process of synthesis of food in green plants.
Answer:
Green plants make their food using sunlight, carbon dioxide, and water. The chlorophyll in the leaves absorbs sunlight, while the plant takes in carbon dioxide from the air through small openings called stomata and water from the soil through the roots. Using sunlight’s energy, the plant combines carbon dioxide and water to produce glucose (food) and release oxygen as a by-product.

Question 16.
How do plants transport raw materials to the food factories of the plants?
Answer:
Plants transport raw materials to the leaves through different methods. Water is absorbed by the roots and carried to the leaves viaxylem vessels, while carbon dioxide enters the leaves through stomata. Nutrients from the soil are also transported with water. These materials are used by the leaves to make food through photosynthesis. The food prepared in the leaves are transported to other parts of the plant through another set of thin tube-like structure called the phloem.

Life Processes in Plants Class 7 Long Question Answer

Question 1.
What is the role of stomata in both photosynthesis and respiration?
Answer:
Stomata are tiny pores present on the lower surface of leaves. During photosynthesis, stomata allow carbon dioxide to enter the leaves. During respiration, they help in the exchange of gases oxygen comes in, and carbon dioxide goes out. Stomata are very important because they help the plant breathe and make food. Without them, the plant would not be able to take in the gases needed for life processes.

Question 2.
A student says that plants get their food directly from the soil. Explain why this statement is only partially correct. What is the complete process by which plants obtain their food?
Answer:
The statement is partially correct because plants do absorb essential nutrients and water from the soil through their roots, which are essential for growth. However, plants do not get their food directly from the soil in the form that they use it. The complete process involves photosynthesis, which occurs in the leaves. During photosynthesis, plants use sunlight, water absorbed from soil, and carbon dioxide from the air to produce glucose (sugar), their food. Therefore, while the soil provides necessary raw materials, plants manufacture their own food.

Question 3.
Where are useful information for plant growth, soil and agricultural practices recorded?
Answer:
There is an old proverb, “trees do not produce fruits and flowers merely because they are plants”. It is from Vriksha yugveda, an ancient Indian text. Various agricultural practices are helpful in improving growth of plants, their health and food production too. This knowledge has been explained on basis of practical experiences and the pattern at that line. Various farming practices are explained in this text from ancient times. Amid all this refers various methods of organic farming, the preparation of manures with help of water. Water is sprayed on manures. Water, barley, horsegrams, whether black or green etc.

Question 4.
Why is a leaf discolourised is starting in activity to test starch?
Answer:
In the starch test for leaves, a leaf is discoloured (or decolourised) at the beginning of the activity to remove chlorophyll, which is the green pigment in the leaf. This step is essential for the clear observation of the starch test results. To remove the green chlorophyll from the leaf so that any colour change due to iodine can be easily seen. Chlorophyll masks the blue-black colour that indicates the presence of starch. Boil the leaf in water for a minute: This kills the leaf and stops all chemical processes. Boil the leaf in alcohol (usually ethanol): This removes chlorophyll. The leaf turns pale or whitish. Rinse the leaf in warm water: This softens the brittle leaf after alcohol treatment.

Life Processes in Plants Class 7 Case Based Questions

1. Read the following passage carefully and answer the questions that follow:
During respiration plants take O₂ and release CO₂. The CO₂ is use in photosynthesis. In respiration energy is released too. The plants do not have special respiratory organs. In them gaseous exchange takes place by minute pores in leaf surfaces called stomata. You pass CO₂ in a flask having lime water. It will change in milky colour. So in process of respiration, plants take in O₂ and release CO₂. All parts of a plant whether green or non-green release CO₂ in respiration. During respiration, the glucose is broken down to CO₂, water and so energy is released to do work.
(i) What is respiration?
(a) Release of CO₂
(b) Release of Energy
(c) Release of H₂O
(d) All of these
Answer:
(d) All of these

(ii) Word equation for respiration is:
(a) Glucose + Oxygen → Water + Carbon dioxide + Energy
(b) Oxygen + H₂O arrow Glucose + H₂O + Oxygen
(c) Carbon dioxide + Water → Glucose + Water + Oxygen
(d) None of these
Answer:
(a) Glucose + Oxygen → Water + Carbon dioxide + Energy

(iii) The plants respire by stomata found in the:
(a) leaves
(b) roots
(c) flowers
(d) none of these
Answer:
(a) leaves

2. Read the following passage carefully and answer the questions that follow:
A science experiment was conducted using a balsam plant and coloured water. Over time, students observed the colour rising through the stem and reaching the leaves. The teacher explained this showed transport of water via xylem vessels. Similarly, the phloem transports food from leaves to other parts. These systems are part of a plant’s vascular tissue.

(i) What is the function of xylem in plants?
(a) Transport of food
(b) Transport of water
(c) Photosynthesis
(d) Exchange of gases
Answer:
(b) Transport of water

(ii) What does the phloem transport in plants?
(a) Water and minerals
(b) Only oxygen
(c) Food prepared by leaves
(d) Nutrients from soil
Answer:
(c) Food prepared by leaves

(iii) In which part of the plant does photosynthesis mainly occur?
(a) Roots
(b) Stems
(c) Flowers
(d) Leaves
Answer:
(d) Leaves

(iv) Which vascular tissues are responsible for transport in plants?
(a) Epidermis and guard cells
(b) Root hairs and stem
(c) Xylem and phloem
(d) Chloroplasts and mitochondria
Answer:
(c) Xylem and phloem

Life Processes in Plants Class 7 Picture Based Questions

1. Look at the figure and answer the following questions:
Life Processes in Plants Class 7 Extra Questions and Answers Science Chapter 10 1
(i) Identify the figure:
Answer:
The diagram represents that sunlight is essential for photosynthesis.

(ii) From where does spotted plant get sunlight?
(a) From the sun
(a) and (b)
(b) From the air
(c) Both
(d) None of these
Answer:
(a) From the sun

(iii) Mention two conditions essential for formation of food by a plant.
(a) Sunlight, chlorophyll
(b) Oxygen, nitrogen
(c) Soil, glucose
(d) None of these
Answer:
(a) Sunlight, chlorophyll

Life Processes in Plants Extra Questions for Practice

Multiple Choice Questions (MCQs):

Question 1.
Photosynthesis occurs in
(a) green leaf
(b) root
(c) flower
(d) seed

Question 2.
Which of these elements is needed in addition to carbon, hydrogen, oxygen to make proteins?
(a) Nitrogen
(b) Calcium
(c) Iron
(d) Potassium

Question 3.
Necessary for photosynthesis:
(a) chlorophyll
(b) carbon dioxide
(c) Water
(d) All of these

Question 4.
Which of these are autotrophs?
(a) all plants
(b) all animals
(c) all insects
(d) all green plants

Question 5.
Water plus minerals transport occur by:
(a) xylem
(b) leaf
(c) flower
(d) epidermis

Question 6.
Which of these is not essential for photosynthesis
(a) carbon dioxide
(b) oxygen
(c) sunlgiht
(d) chlorophyll

Very Short Answer Type Questions:

Question 1.
Name a pores in leaves through which exchange of gases occur.

Question 2.
What is photosynthesis? Define in few words.

Question 3.
Name substance that is broken down in the body to obtain energy and to grow.

Question 4.
Name a structure that carries water and minerals from roots to leaves of a plant.

Short Answer Type Questions:

Question 1.
Do plants respire?

Question 2.
How is CO₂ released in respiration?

Question 3.
How do leaf exchange gases in photosynthesis?

Question 4.
Write a note in “Transport in plants”.

Question 5.
How do all plants get their food?

Question 6.
How is food formed in green plants?

Question 7.
Define breathing rate.

Question 8.
Give two differences between photosynthesis and respiration.

Question 9.
Give word equation for photosynthesis.

Question 10.
How does plants produce food?

Question 11.
What is so special about leaves that they can synthesize food but other parts of plants cannot?

Long Answer Type Questions:

Question 1.
Describe respiration in brief.

Question 2.
Take a test tube. Keep water and chlorophyll in it. Leave it open in the sunlight for 2-3 hours. Will photosynthesis occur in it or not? Explain briefly.

Question 3.
How would you test the presence of starch in green leaves?

Question 4.
How do plants make their food?

Question 5.
Show by help of a sketch that plants are the ultimate source of food.