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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

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Ascent of sap is mainly attributed to :

cohesion force

imbibition

root pressure

capillarity

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Which one is responsible for opening and closing of stomata :

Rise in pH of guard cells, hydrolysis of starch

Cytolinins and CAMP required

Abscisic acid promotes closure

All the above.

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Potometer works on the principle of :

Amount of water absorbed equals the amount transpired

Osmotic pressure

Root pressure

Potential difference between the tip of the tube and that of the plant.

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Which of the following in guard cell is responsible for opening of stomata?

decrease in $C O_{2}$ concentration and more $H^{+}$ ion

decrease in $C O_{2}$ concentration and less $H^{+}$ ion concentration

increase in $C O_{2}$ concentration and more $H^{+}$ ion concentration

More free $H^{+}$ ion and less $C l^{-}$ ion.

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Passive adsorption of water by the root system is the result of

Forces created in the cells of the root

increased respiatory activity in root cells

tension on the cell sap due to transpiration.

osmotic force in the shoot system.

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Water is lost in a liquid state in some plants through hydathodes. These hydathodes

remain closed at night

remain closed during day

remain always open

do not show any specificity in opening and closing.

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In land plands, the guard cells differ from other epidermal cells in having :

Cytoskeleton

Mitochondria

Endoplasmic reticulum

Chloroplasts

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Turgor pressure is also referred to as

solute potential

water potential

pressure potential

osmotic potential

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In most species, as K⁺ moves in or out of the guard cell to regulate the stomatal opening, there is movement in the opposite direction by

Na⁺

H⁺

OH^-

Cl^-

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The opening of the stomata is effected by all of the following except

oxygen concentration

temperature

light

carbon dioxide concentration

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