Test Preparation on Transport in plants – II Biology Test Series for NEET - 2020

Which of the following is produced during water stress and
causes closure of stomata
(a) Cytokinin (b) Auxin
(c) GA₃ (d) ABA

(d) In the case of hydroactive control abscisic acid (ABA)
plays an important role in the closure of stomata, when
ever there is shortage of water ABA is synthesized
resulting in the closure of stomata.

The conditions under which transpiration would be most rapid

1High humidity
2Excess of water in soil
3Low humidity, high temperature, guard cells are turgid (open) and moist soil
4Low velocity of wind

(c) Increase in the temperature of the air decreases the
humidity of the air and therefore more water is
vapourised and lost from the transpiring surface.
When soil is moist means availability of water are
sufficient, stomata will open thus rate of transpiration
increases.

The transpiration in plants will be lowest

1When there is high humidity in the atmosphere
2High wind velocity
3There is excess of water in the cell
4Environmental conditions are very dry

(a) If the atmosphere is very humid and relatively saturated
its capacity to absorb water is low and the rate of
transpiration is slowed down.

Which of the following is not a purpose of transpiration

1Supplies water for photosynthesis
2Helps in translocation of sugars from source to sink and prevents loss of water
3Maintains shape and structure of the plants
4Cools leaf surfaces

Which of the following may be used as an anti–transpirant
in plant

1Phenyl mercuric acetate
2Cobalt chloride
3Mercury
4Potassium

Which one of the following is not an antitranspirant

1PMA
2BAP
3Silicon oil
4Low viscosity

Transpiration can be influenced by interfering with

1Air temperature
2Epidermis of leaf
3Guard cell
4Osmotic pressure

Increase in CO₂ concentration around leaf results in

1Rapid opening of stomata
2Partial closing of stomata
3Complete closure of stomata
4There will be no effect on stomatal opening

Select the correct events leading to the opening of the
stomata
(i) Decline in guard cell solutes
(ii) Lowering of osmotic potential of guard cells
(iii) Rise in potassium levels in guard cells
(iv) Movement of water from neighbouring cells into guard
cells
(v) Guard cells becoming flaccid

1(i) and (v) only
2(ii), (iii) and (iv) only
3(i), (iii) and (iv) only
4(ii), (iv) and (v) only


Right Ans	Wrong Ans	Not Attempted

Test Preparation on Transport in plants – II Biology Test Series for NEET - 2020

Which of the following is produced during water stress andcauses closure of stomata(a) Cytokinin (b) Auxin(c) GA3 (d) ABA

The conditions under which transpiration would be most rapid

The transpiration in plants will be lowest

Which of the following is not a purpose of transpiration

Which of the following may be used as an anti–transpirantin plant

Which one of the following is not an antitranspirant

Transpiration can be influenced by interfering with

Increase in CO2 concentration around leaf results in

Select the correct events leading to the opening of thestomata(i) Decline in guard cell solutes(ii) Lowering of osmotic potential of guard cells(iii) Rise in potassium levels in guard cells(iv) Movement of water from neighbouring cells into guardcells(v) Guard cells becoming flaccid

Check your progress:

Which of the following is produced during water stress and
causes closure of stomata
(a) Cytokinin (b) Auxin
(c) GA₃ (d) ABA

Which of the following may be used as an anti–transpirant
in plant

Increase in CO₂ concentration around leaf results in

Select the correct events leading to the opening of the
stomata
(i) Decline in guard cell solutes
(ii) Lowering of osmotic potential of guard cells
(iii) Rise in potassium levels in guard cells
(iv) Movement of water from neighbouring cells into guard
cells
(v) Guard cells becoming flaccid