The process in which mature differentiated cells reverse to meristematic activity to form callus is called

• redifferentiation

• dedifferentiation

• cyto-differentiation

• differentiation

Which of the following plant is efficient converter of solar energy whose net productivity is 2-4 kg/m²/yr or even higher?

• Wheat

• Rice

• Sugarcane

• Bajra

In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called

• selection of superior recombinants

• cross- hybridisation among the selected parents

• evaluation and selection of parents

• germplasm collection

Pollorum disease of poultry is caused by

• Mycobacterium

• Salmonella

• Clostridium

• Haemophilus

Stock and scion are used in

• cutting

• grafting

• layering

• micropropagation

Type of blastula in chick is

• discoblastula

• coeloblastula

• amphiblastula

• holoblastula

Which of the following is an example of a defence used by plants against herbivorous?

I. Production of caffeine, tannin, quinine.

II. More production of non-woody tissues.

III. Production of hairs, thorns, spines.

IV. Production of hormones like chemicals that interfere with insect metamorphosis.

Select the correct codes

• I and II

• II, III and IV

• I, II and III

• I, III and IV

Which of the following is the best suited method for the production of virus free plants?

• embryo culture

• meristem culture

• ovule culture

• anther culture

The life span of honey bee drone is

• 3-4 months

• 1-2 months

• 6-7 months

• 10-12 months

On the basis of utility, Nagpuri buffaloes are categorized as

• milkers

• dual purpose

• drought cattle

• grazers