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Opening and Closing of the Stomata

During the da...

Question

During the day, chloroplasts in the guard cells photosynthesise, which leads to the production of _. This is used to actively pump the _ ions of the adjacent cells into the guard cells.

A

ADP, water

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B

ATP, water

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C

ADP, potassium ions

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D

ATP, potassium ions

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Solution

The correct option is D
ATP, potassium ions

During the day, chloroplasts in the guard cells photosynthesise, which leads to the production of ATP. This is used to actively pump the potassium ions of the adjacent cells into the guard cells.

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Q. Given below are five groups of five terms in each. Arrange the terms in each group in their proper sequence.
I.Renal Pelvis, Urethra, Ureter Kidney Urinary Bladder
ii. Sodium ions move into the axon, Repolarisation. Polarisation, Stimulus, Depolarisation
iii. ATP is produced, guard cells photosynthesise during the day guard cells become more turgid. guard cells become hypertonic, Potassium ions are actively pumped into the guard cells
iv Efferent ducts, Network of ducts, Seminiferous tubules. Urethra, Vas deferens v. Response, Effector Brain or Spinal Cord, Receptor Stimulus

Q. According to

H^{+} - K^{+}

exchange pump mechanism of stomatal movement
I.

K^{+}

ions accumulate in guard cells during the day.
II.

H^{+}

ions are pumped out from guard cells and

K^{+}

ions are pumped into guard cells.
III. Water potential of guard cells decreases with the accumulation of

K^{+}

ions together with

C l^{-}

and organic acid ions.
IV. Water enters into guard cells from epidermal and mesophyll cells due to decreased water potential of guard cells.

K^{+}

ions into guard cells and efflux of

H^{+}

ions from guard cells leads to

Q. Select the correct events leading to the stomatal opening.
(a) The decline in guard cell solutes.
(b) Lowering of osmotic potential of guard cells.
(c) Rise in K ions in guard cells.
(d) Movement of water from neighboring cells into guard cells.
(e) Guard cells become flaccid.

Q. The sodium-potassium pump functions to pump ions into the cells and ions out of the cell.

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