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281.

Rice varieties IR 20, IR 26 and IR 36 have shown better resistance to:

A.	Tungro	B.	Bacterial leaf blight
C.	Blast	D.	Brown plant hopper

282.

Root bear:

A.	Unicelluar hairs	B.	Multicellular hairs
C.	Both (a) & (b)	D.	None of the above

283.

Root has:

A.	Root cap	B.	Region of cell division
C.	Give proper anchorage to plant	D.	All of the above

284.

Secondary nucleus in the embryosac is:

A.	Hoplold	B.	Diploid
C.	Triploid	D.	Hexaploid

285.

Seeds of monocotyledons are:

A.	Albuminous or non-endospermic	B.	Ex-albuminous or non-endospermic
C.	Both (a) & (b)	D.	Neither (a) nor (b)

286.

Seeds of pea, gram and beans are:

A.	Albuminous or non-endospermic	B.	Ex-albuminous
C.	Both (a) & (b)	D.	None of the above

287.

Selfing of a plant increases:

A.	Heterozygosity	B.	Homozygosity
C.	Homogenecity	D.	Heterogenecity

288.

Sex in Drosophila is governed by the following mechanism:

A.	XY methods	B.	OX method
C.	ZZ method	D.	X autosomes ratio

289.

Single gene affecting more than one character is:

A.	Polymorphism	B.	Pleiotropy
C.	Phenocopy	D.	Complete penetrance

290.

Specific combining ability of the parents should be high in order to develop:

A.	Hybrids	B.	Composites
C.	Varieties	D.	Synthetics