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  • Consider the following three statements and select the correct stating which ones are true (T) and which ones are false (F). (i) Hybridisation is crossing of two or more types of plants b

Consider the following three statements and select the correct stating which ones are true (T) and which ones are false (F).

(i) Hybridisation is crossing of two or more types of plants bringing their traits together in progeny.

(ii) Semi-dwarf rice varieties were derived from IR-8 and Taichung Native - 1

(iii) Hybrid breeding has led to the development of several high yielding varieties resistant to water stress.

Option: 1

(i)      (ii)      (iii)

 F       T         T


Option: 2

(i)      (ii)      (iii)

 T       T         F


Option: 3

(i)      (ii)      (iii)

 F       T         F


Option: 4

(i)      (ii)      (iii)

 T       T         T


Answers (1)

best_answer

 

Hybridization is used when resistant genes are available either in the germplasm or in wild species of crop plants. After hybridization, the hybrid material is handled either by pedigree method or by backcross method. The pedigree method is used when the resistance is governed by polygene and the resistant variety is an adapted one which also contributes some desirable agronomic traits. The backcross method is used when resistance to governed by oligogenes.
Induced mutations are also use for disease resistance. Many disease resistant varieties have been developed in various crops through induced mutations.
Hence, the correct option is (d).

 

 

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Riya

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