Transpiration

Q.

Transpiration and root pressure cause water to rise in plants by:

1. Pulling and pushing it, respectively

2. Pushing and pulling it, respectively

3. Pushing it upward

4. Pulling it upward

Q. A watered potted plant is covered in a plastic bag. After a while, water droplets are seen on the inside of the bag. Which among the following is responsible for this observation in plants?

1. Reproduction
2. Photosynthesis
3. Transpiration
4. Respiration

Q.

Kidney shaped cells that surround the stomata are called guard cells. True or false?

1. True

2. False

Q.

The plants synthesize their carbohydrates from___, ___and___with the help of green pigment known as chlorophyll.

1. Water, Nitrogen, Sunlight

2. Water, Carbon dioxide, Sunlight

3. Water, Oxygen, Sunlight

4. None of the above

Q.

The lamina of the leaf is

1. flattened leaf blade.

2. upper surface of the leaf.

3. lower surface of leaf.

4. network of veins in the leaf.

Q. The process in which excess water comes out in the form of vapour through leaves is called __________.

1. transpiration
2. photosynthesis
3. respiration
4. digestion

Q.

What is the meaning of transducer organisms?

Q.

The loss of excess water by diffusion through the stomata of leaves of a plant into the atmosphere is called

1. Transpiration

2. Respiration

3. None of these

4. Photosynthesis

Q.

Which of the following factor decreases the rate of transpiration

1. Closure of stomata

2. Dry air

3. Low water content of leaf

4. High water content of the leaf

Q.

What percent of the water absorbed by the plant is used for photosynthesis and other activities?

1. 100%

2. 10%

3. 2%

4. 50 %

Q.

What stomata open at night?

Q.

What is photosynthesis ?

Q.

What process can reduce the rate of photosynthesis?

Q.

Which part of the leaf is responsible releasing oxygen produced during photosynthesis?

1. Stomata

2. Leaf blade

3. Flower bud

4. Root cap

Q.

Do plants breathe Co2?

Q.

Cobalt chloride paper is used to demonstrate which of the following process?

1. Leaves, Vessels, Roots

2. Roots, Vessels, Leaves

3. Vessels, Leaves, Roots

4. Roots, Leaves, Vessels

Q.

Question 16

Observe the figure of an activity given, carried out with leaves of plants and polythene bag. Now answer the following.

(a) Which process is demonstrated in the activity?
(b) When will this activity show better results on a bright sunny day or a cloudy day?

(c) What will you observe in the polythene bag after few hours of setting up the activity?
(d) Mention any one precaution you must take while performing this activity?

Q. What happens when the leaves of a plant are smeared with grease and observed after a week?

Q.

Evaporation of water is mediated by which part of the plant?

1. Fruit

2. Leaves

3. Stem

4. Root

Q.

enters the leaves of the plants through stomata and helps in photosynthesis.

Q.

Which of the following options is correct based on the statements given?

Statement 1: Gaseous exchanges in plants usually occur on the top side of leaves.

Statement 2: Tiny pores called stomata to facilitate this exchange.

Statement 3: The exchange of water vapour and carbon dioxide takes place through stomata.

1. Only statements 1 and 3 are correct.

2. Only statement 2 is correct.

3. All statements are correct.

4. Only Statements 2 is correct.

Q.

Part of the leaf that carries out photosynthesis.

Q.

Transpiration is a necessary evil in plants.

1. True

2. False

Q.

Green plants are called __________.

Q.

If a potted plant is covered with a glass jar, water vapors appear on the wall of the glass jar. Explain why?

Q.

Observe the picture. Which process is demonstrated in the activity?

1. Photosynthesis

2. Transpiration

3. Oxygen is required for survival

4. Carbon dioxide is released during day

Q.

A plant has reticulate venation. Which of the following is the correct combination of root and seed type?

1. Companion cell; controlling size of vessels

2. Guard cells; controlling size of vessels

3. Parenchyma cell; controlling size of stomata

4. Guard cells; controlling size of stomata

Q. Loss of excess water from aerial parts of a plant is called ____.

1. condensation
2. evaporation
3. transpiration
4. distillation

Q. Transpiration will be fast when the day is .

1. hot and humid
2. hot and dry
3. cold and humid
4. cold and dry

Q. How is the stomata formed?