Which of the following terms would be used to explain how trees can lift water to heights of ten stories or more?
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NEET Practice Questions (MCQs) with Answers & Solutions
Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following will not cause the stomata to close?
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Explanation
Light induces stomatal opening as photosynthesis takes place through it.
Absorption of water by guard cells causes them to swell and open up the stomatal pore.
Low or reduced Carbon dioxide causes stomata to open up so more of it can be absorbed for the synthesis of food.
pH has no significant contribution to the opening or closing of stomata.
Not an aid to water absorption is
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The presence of free starch in the cell will serve to
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Explanation
Water is imbibed through the sub microscopic capillaries present on the surface of the body. Substances such as cellulose and starch are hydrophilic and are imbibants.
Imbibition pressure is called matric potential (Ψw). The matric potential in an imbibant results primarily from adsorptive forces which bind water molecules to micelles or molecules of the adsorbant
The water is free to move between the cells except through the
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Explanation
Water can only pass through the endodermis by crossing the membrane of endodermal cells twice (once to enter and a second time to exit). Water moving into or out of the xylem, which is part of the apoplast, can thereby be regulated since it must enter the symplast in the endodermis.
Translocation does not involve
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Continuity of protoplasm in sieve elements is maintained through
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Explanation
Adjoining sieve tubes are connected by strands of protoplasm (Plasmodesmata).
Which is not an advantage of transpiration.
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Explanation
Advantages of Transpiration:
1. Ascent of Sap
2. Removal of Excess Water
3. Cooling Effect
4.Distribution of Mineral Salts
5 .Maintaining shape of cells
One of the following is not a pre-requisite for transpiration?
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Explanation
High soil water potential is not a is not a pre-requisite for transpiration .
A manifestation of root pressure is
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Explanation
Guttation is the manifestation of root pressure. Transpiration is the manifestation of turgor pressure
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