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271.

When a plant cell is placed in a solution, which is hypotonic to the cell sap, which of the following conditions will not apply?

A.	The wall pressure of the cell will fall	B.	The cell will become turgid
C.	The suction pressure of the cell sap will fall	D.	The water potential of the cell sap will rise

272.

Without adding nitrogenous manures good yield or rice crop can be obtained because:

A.	Their roots have nitorogen-fixing bacteria	B.	There are nitrogen fixing algae in rice fields
C.	Rice plants do not require nitrogen	D.	They require minute quantities of nitrogen

273.

One of the alkaloids listed below is found in cocoa beans:

A.	Theobromina	B.	Caffeine
C.	Quinine	D.	Colchicines

274.

Members of bean family are of particular importance in crop rotation programmes primarily because:

A.	They add nitrates to the soil	B.	They manufacture nitrogenous compounds
C.	They have nitrogen-fixing bacteria associated in their roots	D.	They provide green manure

275.

Algae float in water during daytime and sink during nighttime because:

A.	They become light due to consumption of food materials in respiration	B.	They become buoyant in light due to accumulation of oxygen bubbles released in photosynthesis
C.	They come up to enjoy sunshine	D.	They loose weight at night

276.

It is not advisable to sleep under the trees at night because:

They release carbon dioxide during night

They release oxygen during night

277.

How do most of the plants obtain air?

A.	Through a system of branches	B.	Through the tips of branches
C.	Through opening in the leaves	D.	From water that comes up from soil

278.

By hormone application it is possible to obtain seedless fruits. In which of the following it is desirable to obtain seedless fruits?

A.	Tomato	B.	Orange
C.	Watermelon	D.	Pomegranate

279.

The process by which proteins are synthesized in a cell is called:

A.	Translation	B.	Transduction
C.	Translocation	D.	Transcription

280.

Root pressure is maximum when:

A.	Transpiration is very high and absorption is also high	B.	Transpiration and absorption both are low
C.	Transpiration is high and absorption is very low	D.	Transpirtion is very low and absorption is high