Transpiration

Q.

Describe the functions of leaves.

Q.

Define the following:
Simple leaf

Q.

What are root hairs? What is the significance of root hairs? [2 MARKS]

Q.

Phloem carries water from the roots to the leaves in plants.

1. True
2. False

Q. Which of the following parts of the plant are involved in the process of transpiration?

1. Stomata
2. Root hair
3. Phloem
4. Xylem

Q. Water moves from the roots to leaves through and food moves from the leaves to the rest of the plant through .

1. meristem
2. xylem
3. chlorophyll
4. phloem

Q.

How water is drawn up the xylem vessel due to transpiration pull?

Q. Question 2 (viii)
Fill in the blanks
(viii) Water reaches great heights in the trees because of suction pull caused by ___.

Q.

A proper system of transportation is essential in plants. Explain.
[3 MARKS]

Q.

Which one of the following statements is not true about transpiration in plants?

1. Transpiration is faster in hot summer days

2. Transpiration is less when the wind is blowing faster

3. Transpiration is reduced if the air is humid

4. No transpiration occurs at night

Q.

Which of the following are/are the functions of root hair?

1. Increase the surface area of the root for absorption of water
2. They help in the transport of food
3. They carry out photosynthesis under the soil.
4. They store the extra food that is produced by the leaves.

Q. ___________ helps in the upward movement of water from roots to the leaves in tall trees.

1. Translocation

2. Transpiration

3. Gravity

4. Root pressure

Q.

The loss of water from leaves is called______.

Q. ------- helps in temperature regulation in plants.

1. Transpiration

2. Transfixion

3. Transcedence

4. Translocation

Q.

In a tall tree, which force is responsible for pulling water and minerals from the soil?

(a) Gravitational Force

(b) Conduction Force

(c) Suction force

(d) Transportation force

Q.

The transpiration in plants will be lowest

1. There is excess of water in the cell.

2. Environmental conditions are very dry.

3. High wind velocity.

4. When there is high humidity in the atmosphere.

Q.

Who discovered stomata?

Q.

Lenticels are involved in?

1. gaseous exchange

2. photosynthesis

3. transpiration

4. food transport

Q.

Which part of a plant evaporates water?

Q. Why is the flow of water multi directional in phloem, but uniform directional in xylem?

Q.

Plants die due to wilting when:

1. Available light is reduced to half

2. Xylem is blocked

3. A few roots are broken

4. Phloem is blocked

Q.

Exchange of gases to help in transpiration ---------------------

Q.

A plant is left in the hot sun for six hours.

The diagram shows how the appearance of the plant changes during this time.

Which statement explains the change in appearance of the plant?

1. The water potential of the cells has increased.

2. More water is lost by transpiration than is absorbed.

3. Stomatas have closed.

4. There is less support provided by the xylem.

Q.

Name the processes by which leaves lose water into the air.

Q. Why the rate of transpiration is not same all the time ? Why does it change's

Q. What will happen if xylem tissue of a plant gets damaged in a branch of tree? Also briefly explain the transport of water and minerals in plants?

Q. How both transpiration and light affect the rate of photosynthesis?

Q.

Complete the sentence by choosing the correct option.

When stomata are open ...

1. both water vapour and carbon dioxide move in and out through the stomata.

2. only carbon dioxide moves in and out through the stomata.

3. only water vapour moves in and out through the stomata.

4. only oxygen moves in and out through the stomata.

Q.

Paheli noticed water being pulled up by a motor-pump to an overhead tank of a five-storeyed building. She wondered how water moves up to great heights in the tall trees standing next to the building. Can you tell how?

Q.

Gaseous exchange in plants occurs through tiny openings present in the leaves known as _____.

1. tendrils
2. Xylem
3. Stomata
4. Stalk