Transpiration

Q.

Transpiration pull will be maximum under which of the following conditions:

1. Open stomata, dry atmosphere and moist soil

2. Open stomata, highly humid atmosphere and well irrigated soil

3. Open stomata, highly humid atmosphere and dry soil

4. Close stomata, dry atmosphere and dry soil

Q.

Water reaches the top of a plant due to

1. Capillarity

2. Root pressure

3. Transpiration

4. Diffusion

Q.

During what stage of photosynthesis is O2 produced?

1. the light-dependent reactions involving photosystems I and II

2. carbon fixation

3. the Krebs cycle

4. cyclic photophosphorylation

Q.

Girdling is a process by which

1. plants carry nutrients downward.

2. a tree is killed by interrupting the passage of phloem sap.

3. plants carry water upward.

4. plants carry nutrients upward.

Q.

The process of transpiration in plants helps in:

1. opening of stomata

2. absorption of CO₂ from atmosphere

3. upward conduction of water and minerals

4. absorption of O₂ from atmosphere

Q.

Define the following term:

1. Transpiration.

Q.

Draw illustrations to bring out anatomical difference between

(a) Monocot root and dicot root

(b) Monocot stem and dicot stem

Q.

Transpiration is manifestation of

1. turgor pressure

2. wall pressure

3. root pressure

4. None of these

Q. Cohesion-tension-transpiration pull model explains:

1. Transpiration in plants
2. Water transport in plants
3. Conduction of food in plants
4. Transport of organic materials

Q. Passive absorption of water in plants is mainly occurs due to

1. transpiration
2. capillarity
3. presence of solutes in soil
4. imbibition

Q.

Due to low atmospheric pressure, the rate of transpiration will

1. increase

2. decrease rapidly

3. decrease slowly

4. remain unaffected

Q. Foliar transpiration includes _______.

1. Stomatal transpiration
2. Cuticular transpiration
3. Both a $\&$ b
4. Lenticular transpiration.

Q. Transpiration is least in:

1. High atmospheric humidity
2. High wind velocity
3. Dry environment
4. Low atmospheric humidity

Q. Transpiration

1. supplies water for photosynthesis
2. transports minerals from the soil to all parts of the plant
3. helps in cooling
4. All of the above.

Q. Differentiate between the water transport system of Porifera and Echinodermata ?

Q. Potometer works on the priniciple of:

1. Potential difference between the tip of the tube and that of the plant
2. Amount of water absorbed equals the amount transpired
3. Osmotic pressure
4. Root pressure

Q.

which experiment is used to find out that food is translocated via the phloem?

Q. When lenticels are blocked which one dies first?

1. Root
2. Shoot tip
3. Leaves
4. None of these

Q.

The rate of transcription in plants is dependent upon

1. Temperature and soil

2. Light and temperature

3. Wind, temperature and light

4. Light, temperature, atmospheric humidity and wind

Q. A flowering plant is planted in an earthen pot and irrigated. Urea is added to make theplant grow faster, but after some time the plant dies. Give its possible reasons.

Q.

the passive absorption of water from soil is mainly affected by,

a)tissue organization of root

b)sucking power of root hairs

c) tension of cell sap due to transpiration

d)osmotic concentration of cell sap

Q.

Root hairs are unicellular or multicellular.explain?

Q. A structure peculiar to Nautilus is

1. Siphuncle/living tube
2. Spirally coiled shell
3. External shell
4. Nocturnal nature

Q. What is the relation between number of stomata and rate of transpiration?

Q. Which one of the following is not a type of transpiration?

1. Cuticular transpiration
   
2. Lenticular transpiration
   
3. Bark transpiration
   
4. None of the above