81.

Which one from those given below is the period for Mendel's hybridization experiments?

• 1856 - 1863

• 1840 - 1850

• 1857 - 1869

• 1857 - 1869

Which one of the following statements is not valid for aerosols?

• They are harmful to human health

• They alter rainfall and monsoon patterns

• They cause increased agricultural productivity

• They cause increased agricultural productivity

Homozygous purelines in cattle can be obtained by

• mating of related individuals of same breed

• mating of unrelated individuals of same breed

• mating of individuals of different breed

• mating of individuals of different breed

Artificial selection to obtain cows yielding higher milk output represents

• Stabilizing selection as it stabilizes this character in the population

• Directional as it pushes the mean of the character in one direction

• Disruptive as it splits the population into two one yielding higher output and the other lower output

• Disruptive as it splits the population into two one yielding higher output and the other lower output

Alexander Von Humbolt described for the first time

• Ecological Biodiversity

• Laws of limiting factor

• Species area relationships

• Species area relationships

In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation?

• Intrauterine transfer

• Gamete intracytoplasmic fallopian transfer

• Artificial Insemination

• Artificial Insemination

The function of copper ions in copper releasing IUD's is :

• They suppress sperm motility and fertilising capacity of sperms

• They inhibit gametogenesis

• They make uterus unsuitable for implantation

• They make uterus unsuitable for implantation

Which of the following in sewage treatment remove suspended solids?

• Tertiary treatment

• Secondary treatment

• Primary treatment

• Primary treatment

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement

• Both are due to a qualitative defect in globin
  chain synthesis

• Both are due to a quantitative defect in globin chain synthesis

• Thalassemia is due to less synthesis of globin molecules

• Thalassemia is due to less synthesis of globin molecules

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

• Water

• Bee

• Wind

• Wind