While studying the history of domestication of various cultivated plants _______ were recognized earlier

(a)

Centres of origin

(b)

Centres of domestication

(c)

Centres of hybrid

(d)

Centres of variation

Match Column I with Column II

Column I	Column II
i) William S. Gaud	I) Heterosis
ii) Shull	II) Mutation breeding
iii) Cotton Mather	III) Green revolution
iv) Muller and Stadler	IV) Natural hybridization

(a)

i	ii	iii	iv
I	II	III	IV

(b)

i	ii	iii	iv
III	I	IV	II

(c)

i	ii	iii	iv
IV	II	I	IV

(d)

i	ii	iii	iv
II	IV	III	I

The quickest method of plant breeding is _______.

(a)

Introduction

(b)

Selection

(c)

Hybridization

(d)

Mutation breeding

Desired improved variety of economically useful crops are raised by _______.

(a)

Natural Selection

(b)

hybridization

(c)

mutation

(d)

biofertilisers

Plants having similar genotypes produced by plant breeding are called _____.

(a)

clone

(b)

haploid

(c)

autopolyploid

(d)

genome