Schizogony occurs in 

• RBC of human

• intestine of parasite

• liver of human

• liver of parasite

Gases found in primitive atmosphere are

• CH₄, NH₃, H₂, H₂O (vapour form)

• CH₄, NH₃, CO₂, H₂O

• CH₄, H₂O, CO₂

• CH₄, O₂, CO₂

Sertoli cells are found in testis. These cells are

• nurse cells

• reproductive cells

• receptor cells

• None of the above

Species can be identified on the basis of

• interbreed

• species diversity

• reproductive isolation

• None of the above

Covered smut of barley is caused by

• Ustilago hordei

• Tilletia caries

• Ustilago nudo

• Colletotrichum falcatum

Growth of pollen tube towards embryo sac is

• geotropism

• thigmotaxis

• chemotaxis

• All of these

67.

Ozone depletion in stratosphere would result in 

• forest fires

• global warming

• skin cancer incidence

• None of the above

Which of the following is a test cross?

• Tt $\times$tt

• TT $\times$tt

• Tt $\times$Tt

• tt $\times$tt

1 : 2 : 1 phenotypic and genotypic ratio is found in

• complementary genes

• blending inheritance

• multiple alleles

• pseudo alleles

The back bone of RNA consists of which of the following sugar?

• Deoxyribose

• Ribose

• Sucrose

• Maltose