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271.

Pureline selection is:

A.	A method of accumulating favourable alleles	B.	Used to improve cross-pollinated crops
C.	Used to improve self-pollinated crops	D.	Used in vegetatively propagated crops

272.

Quarantine is:

A.	The name of a plant	B.	The name of a character
C.	The process of observation of alien material	D.	None of the above

273.

Rainfall, temperature, light, wind and humidity are:

A.	Climatic factors	B.	Edaphic factors
C.	Biotic factors	D.	Topographic factors

274.

Random assortment of genes will occur if the gene are located on:

A.	Same chromosome	B.	Different chromosomes
C.	Sex chromosome	D.	Autosome

275.

Recessive lethal genes are carried in the:

A.	Heterogenous form	B.	Hetrozygous form
C.	Homozygous form	D.	Homogenous form

276.

Recurrent selection is mostly used in:

A.	Cross pollinated crops	B.	Self pollinated crops
C.	Vegetatively propagated crops	D.	Apomictic crop plants

277.

Reduction Division in micro-sporogenesis occurs when:

A.	Pollen mother cells are produced from & porocytes	B.	Sporocytes are produced
C.	Ovules are formed	D.	Four pollen grains are formed from a pollen mother cell

278.

Registered seed is directly produced from:

A.	Foundation seed	B.	Certified seed
C.	Breeder's seed	D.	All the above

279.

Replacement of purine by pyrimidine and vice-versa is known as:

A.	Transversion	B.	Transduction
C.	Translocation	D.	All the above

280.

Restorer gene is needed:

A.	To make a plant correct	B.	To bring fertility in male sterile plants
C.	To make a plant resistant	D.	To enhance the yield