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201.

Before opening of stomata, accumulation of one of the ion is guard cell:

A.	P	B.	K
C.	Mg	D.	Na

202.

In nature, the main organisms, which take part in nitrogen cycle, are:

A.	Parasitic fungi	B.	Legume plants
C.	Bacteria plants	D.	Saprophytic flowering

203.

In terms of permeability the cell wall and plasmalemma are:

A.	Permeable and differentially permeable	B.	Both differentially permeable
C.	Both semi-permeable	D.	Semi-permeable and differentially permeable

204.

Water potential concept was formulated by:

A.	Peter Ray, 1960	B.	M.H. Mathew, 1954
C.	Otto Renner, 1915	D.	W.C. Hoffer, 1920

205.

One of the following is a precursor of auxin:

A.	Phenylalanine	B.	Methionine
C.	Tryptophan	D.	Cyctosine

206.

Gibberellins were first discovered in ______ in studies with diseased rice plants that grew excessively tall:

A.	Philippines	B.	Thailand
C.	China	D.	Japan

207.

Minerals absorbed by roots move to the leaf through:

A.	Phloem	B.	Sleve rube
C.	Xylem	D.	None of the above

208.

According to the mosaic model (proposed by Singer and Nicholoson) plasma membrance is composed of:

A.	Phospholipids and integrate proteins	B.	Phospholipids, extrinsic proteins, intrinsic proteins
C.	Phospholopids and hemicellulose	D.	Cellulose and hemicellulose

209.

Commonest free ion in the cell is of:

A.	Phosphorous	B.	Potassium
C.	Iron	D.	Sulphur

210.

Two chief functions of leaves are:

A.	Photosynthesis and respiration	B.	Photosynthesis and transpiration
C.	Transpiration and respiration	D.	Respiration and digestion