31.

Delicate hair-like feathers which remain sparsely distributed over the body are

• coverts

• filoplumes

• plumules

• remiges

Homo erectus evolved during

• pleistocene

• miocene

• pliocene

• holocene

Which of the following postulates is related with Neo-Darwinism?

• Mutations are believed to help form new species

• It incorporates isolation as an essential component of evolution.

• It can explain the occurrence of unchanged forms over millions of years.

• All of the above

A person who shows unpredictable moods, outbursts of emotions, quarrelsome behaviour and conflicts with others is suffering from

• borderline personality disorder (BPD)

• mood disorder

• addictive disorder

• schizophrenia

In humans at the end of first meiotic division, the male germ cells differentiate into the

• primary spermatocytes

• secondary spermatocytes

• spermatids

• spermatogonia

Contraceptive oral pills help in birth control by

• killing the sperms in uterus

• preventing implantation

• preventing ovulation

• both (b) and (c)

Which of the following species has the chromosome complement similar to that of Triticum aestivum ?

• Zea mays

• Secale cereale

• Gossypium

• Aegilops

Eugenics is the branch concerned with

• improving the quality of human race by symptomatic treatment of genetic diseases.

• improving the quality of human populations by the application of genetic principles

• improving the quality of human race by providing best suitable environment.

• none of the above

What is incorrect about the following figure representing DNA replication?

• The direction of DNA replication in strand (i)

• The direction of DNA replication in strand (ii)

• Discontinuous replication of strand (i)

• Discontinuous replication of strand (ii)

Cotton fibres mainly contains

• cellulose

• glycogen

• protein

• lipid