CBSE 7th Science Life Processes in Plants - New Sample Question Papers Study Material - QB365 Set A

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Questions:

Multiple Choice Question

10 x 1 = 10

Phloem tissue is responsible for the transportation of

(a)

water

(b)

minerals

(c)

food

(d)

All of the above

Ina flask containing lime water and seeds, the lime water turns milky because the seeds produce extra 'X' through which process 'Y' ?

(a)

X - Oxygen and Y-Photosynthesis

(b)

X - Carbon dioxide and Y- Respiration

(c)

X - Oxygen and Y-Transpiration

(d)

X - Carbon dioxide and Y - Germination

A student places a plant in red-coloured water and notices red colour in the stem after some time. What does this observation most accurately indicate?

(a)

The red colour confirms the presence of chlorophyll in the stem

(b)

Photosynthesis is taking place in the xylem

(c)

Water and minerals are transported upward through xylem

(d)

Phloem helps in the upward movement of red colour

They are pipe-like consisting of a group of specialised cells. They transport substances and form a two-way traffic in plants. Which of the following terms qualifies for the features mentioned above?

(a)

Xylem tissue

(b)

Vascular tissue

(c)

Root hairs

(d)

Phloem tissue

A student observed tiny pores, while examining a leaf peel under a microscope. These pores are mainly responsible for

(a)

transport of water

(b)

storage of food

(c)

exchange of gases

(d)

absorption of minerals

What will happen if a leaf is kept in the dark for an extended period?

(a)

Starch will be produced

(b)

Oxygen will be produced

(c)

No starch will be produced

(d)

Photosynthesis will occur

If iodine is dropped on the boiled decolourised leaf it gives blue-black colour due to the presence of

(a)

starch

(b)

protein

(c)

fat

(d)

vitamin

Which of the following steps are correctly related to the process given in the image below?

A. Place the leaf in a test tube containing alcohol and heat directly on the flame.
B. After the leaf becomes colourless, rinse it in warm water to soften it.
C. Add iodine solution to the decolourised leaf to observe any change.
D. Boll the leaf in water first to stop all cellular processes.

(a)

A, B, C only

(b)

B, C, D only

(c)

A and C only

(d)

A, B, D only

Which of the following energy conversions occur during the process of photosynthesis?

(a)

Solar energy is changed into chemical energy

(b)

Solar energy is changed into mechanical energy

(c)

Bio-energy is converted into chemical energy

(d)

Chemical energy is changed into light energy

10.

In the process of photosynthesis, plants

(a)

take O₂, and release CO₂

(b)

take CO₂ and release O₂

(c)

take water vapour and release O₂

(d)

take O₂ and release water

Case Study Questions

1 x 4 = 4

11.

The picture shows the directions of movement of two different substances in plants.

(i) What do the two types of arrows in the picture show?

(i) Name the tissues responsible for the movement shown in fig.
(a) Xylem and phloem
(b)Stomata and guard cell
(c) Leaf surface and roots
(d) Epidermis and cuticle

Short Answer Type Questions

8 x 2 = 16

12.

Explain the process of respiration in plants and mention its importance.

13.

Differenciate between Xylem and Phloem.

14.

An experiment was conducted using two tumblers-one with plain water and one with red-coloured water. A plant was placed in each tumbler. The next day, red colour was seen in the stem, leaves and flowers of the plant kept in the red-coloured water. What does this experiment show about the movement of water in plants and through which part is this movement taking place?

15.

ldentify 'X' in the given diagram and mention its significance.

16.

State the four essential requirements for photosynthesis and write its word equation.

17.

In the given diagram, what will happen to the leaf inside the bottle and why?

18.

A leaf exposed to sunlight was tested with iodine. Only its green areas turned blue-black, while non-green areas did not. What does this result reveal about the role of chlorophyll in starch formation and why do non-green areas fail to show the blue-black colour?

19.

Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials.
(a) Available in the-plant : ...........
(b) Available in the soil : ..........
(c) Available in the air : ............
(d) Available during day : ............

Long Answer Type Questions

6 x 5 = 30

20.

In the given experiment, Setup A includes a burning candle and a mouse placed under a glass jar. Setup B includes a green plant along with the candle and the mouse under the jar. In Setup A, after a short time, both the flame and the mouse died, while in Setup B, the candle continued to burn longer and the mouse stayed alive for a longer period.

(i) What gas do plants release during photosynthesis that supports the candle's burning and the mouse's breathing?
(ii) What might have happened if the green plant had not been present in Setup B?
(iii) Why did the candle continue to burn longer and the mouse stay alive for a longer period in Setup B?.

21.

Radha kept two plants in her garden. One was placed in a sunny spot where it received direct sunlight, while the other was placed in a shaded area with limited light. After two weeks, Radha observed significant differences in the condition of both plants.
(i) Which plant is likely to be healthier after two weeks and why?
(ii) What will happen to the plant placed in the shaded area over time?
(iii) How does sunlight affect the process of photosynthesis in plants?

22.

It Is not wise to sleep under atree during night. Why?

23.

Design an experiment to prove that all parts of a plant, whether green or non-green, carry out respiration

24.

Like humans and animals, transportation of water, mineral and nutrients also take place in plants. How?

25.

Describe the process by which plants prepare their food using different raw materials.

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Answers Key:

Multiple Choice Question

10 x 1 = 10

(b)
X - Carbon dioxide and Y- Respiration

(d)
Phloem tissue

(a)
starch

(b)
B, C, D only

(a)
Solar energy is changed into chemical energy

10.

(b)
take CO₂ and release O₂

Case Study Questions

1 x 4 = 4

11.

(i) (c) Movement of water, movement of food.
(ii) (a) Xylem andphloem

Short Answer Type Questions

8 x 2 = 16

12.

During respiration, glucose is broken down in the presence of oxygen to release carbon dioxide, water and energy.
Glucose + Oxygen → Carbon dioxide + Water + Energy
The energy released is used by plants for their growth and development. All parts of a plant, whether green or non-green, perform respiration.

13.

The differences between xylem and phloem are as follows

14.

This experiment shows that water moves from the roots to other parts of the plant. The red colour appeared in the stem, leaves and flowers because the coloured water was transported through a tissue called xylem.

15.

'X' in the given diagram is stomata. These are small openings on the surface of leaves. They help in the exchange of gases by allowing carbon dioxide to enter and oxygen to exit. Stomata also control the release of water vapour through transpiration. This helps the plant to maintain water balance and stay cool.

16.

The four essential requirements for photosynthesis are sunlight, water, carbon dioxide and chlorophyll. The equation of photosynthesis is as follows

17.

The leaf inside the bottle will not produce starch because it is deprived of carbon dioxide. Since photosynthesis requires carbon dioxide, the portion of the leaf inside the bottle will not be able to synthesise food and therefore, no starch will be formed in that part of the leaf.

18.

Chlorophyll is essential for photosynthesis and subsequent starch production; the green areas, which contain chlorophyll, produced starch and turned blue-black. Non-green areas lack enough chlorophyll to carry out photosynthesis, so they do not produce detectable starch and remain unstained.

19.

(a) Ávailable in the plant: chlorophyll
(b) Available in the soil: water, minerals
(c) Available in tlhe air: carbon dioxide
(d) Available during day: sunlight

Long Answer Type Questions

6 x 5 = 30

20.

(i) Plants release oxygen during photosynthesis. Oxygen supports both combustion (burning of the candle) and respiration (breathing of the mouse).
(ii) If the green plant had not been present in Setup B, the oxygen level would not have been replenished. As a result, the candle would have gone out and the mouse would have died due to a lack of oxygen, just like in Setup A.
(iii) In Setup B, the green plant performed photosynthesis in the presence of light, releasing oxygen. This oxygen allowed the candle to burn longer and provided the mouse with breathable air, helping it survive for a longer period.

21.

(i) The plant in the sunny spot will be healthier because it receives adequate sunlight for photosynthesis, which is essential for its growth and survival.
(ii) The plant in the shaded area will experience poor growth and may eventually die because it lacks sufficient sunlight, which is necessary for photosynthesis.
(iii)Sunlight is crucial for photosynthesis because it provides the energy needed for plants to convert carbon dioxide and water into glucose, which is used for growth and energy. Without sufficient sunlight, photosynthesis cannot occur efficiently.

22.

During the day, plants photosynthesise in the presence of sunlight and uses CO₂produced during respiration. During this process O₂ is released as a by product and a balance between O₂ and CO₂ is maintained in the atmosphere. But at night, plants do not photosynthesise. Moreover, during night they produce CO₂ and take in O₂ during respiration. This leads to an increase in the proportion of CO₂ in the air. So, if one sleeps under a tree at night, he will have difficulty in breathing, as the amount of CO₂ in the surrounding air will be higher then the amount of oxygen. oxygen. Therefore, it is not advisable to sleep under trees at night because the person will suffer from suffocation and will feel excess weight in the chest.

23.

Aim To demonstrate that all parts of a plant release carbon dioxide during respiration.
Materials Required A plant branch (green and woody parts), airtight jars, limewater in test tubes, rubber stoppers and sealing clay.
Procedure
1.Take a healthy plant branch with both green and woody parts
2. Place the branch inside an airtight jar and seal it properly
3. Connect a test tube with lime water to the jar using a rubber stopper
4. Leave the setup undisturbed for a few hours.
5. Observe any changes in the lime water in the test tube.
Observation Lime water in the test tube turns milky, indicating the presence of carbon dioxide
Conclusion The milky lime water confirms that respiration occurs in both green and woody parts of the plant, as carbon dioxide is released.

24.

Like humans and animals, plants also have a transportation system that helps in the movement of water, minerals and nutrients to different parts of the plant. This system works through two types of conducting tissues-Xylem and Phloem.
• Xylem is responsible for transporting water and minerals. Water is absorbed by the roots from the soil. Along with dissolved minerals, it moves upward through the xylem vessels to the stem, branches and leaves.
• Phloem, on the other hand, transports the food prepared by leaves during photosynthesis to other parts of the plant. This food, mainly in the form of sugar (glucose), is distributed to growing parts like buds, fruits and roots where it is either used or stored. Unlike xylem, phloem can transport substances both upward and downward depending on the plant's needs.

25.

The process by which green plants can prepare their own food is called photosynthesis. Green plants possess chlorophyll in their leaf and utilises carbon dioxide (from air) water, minerals (from soil, through root) as raw material and sunlight as source of energy and convert light energy into chemical energy. The food, thus synthesised is in the form of carbohydrate. The overall reaction for photosynthesis can be given as follows.

CBSE 7th Science Life Processes in Plants - New Sample Question Papers Study Material - QB365 Set A

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Std: 7th Standard CBSE - Science

chapter: Life Processes in Plants - New - Sample Question Papers

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