71.

Which one of the following genus of insects prefer to breed in clean water and their larvae lie parallel to the surface of water?

• Anopheles

• Culex

• Aedes 

• Phlebotomus

Oral contraceptive pill is composed of

• oestrogen and progesterone

• oestrogen and testosterone

• progesterone and testosterone

• oestrogen and growth hormone

A man having the genotype EEFfGgHH can produce P number of genetically different sperms and a woman of genotype IiLLMmNn can generate Q number of genetically different eggs. Determine the values of P and Q.

• P - 4; Q - 4

• P - 4; Q - 8

• P - 8; Q - 4

• P - 8; Q - 8

In an organism, tall phenotype is dominant over recessive dwarf phenotype and the alleles are designated as T and t, respectively. Upon crossing two different individuals, total 250 offsprings were obtained, out of which 124 displayed tall phenotype and rest were dwarf Thus, the genotype of the parents were

• TT $\times$ TT

• TT $\times$ tt

• Tt $\times$ Tt

• Tt $\times$ tt

A-DNA is

• left-handed helix with 12 nucleotide pairs per turn

• right-handed helix with 11 nucleotide pairs per turn

• right handed helix with 12 nucleotide pairs per turn

• left-handed helix with 11 nucleotide pairs per tum

Bursa fabricius is an important organ of birds. This organ is associated with

• generation of basophil

• production of uric acid

• metabolism of fatty acids

• generation of B-cell

Which one of the following is a population?

• A spider and some trapped flies in its web

• Earthworm that lives in a grassland along with other arthropods

• All the plants in a forest

• All the oak trees in a forest

What would be the percentage of thymine in a double stranded DNA sample which contains 20% cytosine of the total bases?

• 10%

• 20%

• 30%

• 40%

Which one of the following is a correct match?

• Filariasis - Taenia solium 

• Encephalitis - Culex vishnui

• Malaria - Phlebotomus sp.

• Kala-azar - Anopheles stephensi

One micrometer is equal to

• 0.0001 mm

• 0.001 mm

• 0.01 mm

• 0.00001 mm