Which of the following contraceptive devices make uterus unsuitable for implantation?

• Progestasert

• CuT

• Lippe's loop

• Multiload

42.

In Miller's experiment, he used a mixture of CH₄, NH₃, H₂ and water vapour in a closed flask to mimic early earth conditions. What was the temperature at which this flask was kept?

• 800$°$C

• 1200$°$

• 200$°$C

• 400$°$C

Sexual stage (gametocytes) of Plasmodium occurs in

• Salivary glands of mosquito

• Human RBC

• Intestine of mosquito

• Human liver

Sporopollenin is a constituent of pollen exine. It can be degraded by the action of

• enzymes

• high temperature

• strong acids

• cannot be degraded

The pollen grains of rice and wheat lose their viability inminutes of their release

• 30

• 10

• 60

• 90

After doble fertilization, a mature ovule has

• 1 diploid and 1 haploid cell

• 1 diploid and 1 triploid cell

• 2 haploid and 1 triploid cell

• 1 haploid and 1 triploid cell

Genetically modified (GM) crops can be produced by

• recombinant DNA technology

• somatic hybridization

• cross breeding

• micropropogation

Which of the following is a palindromic sequence?

• 5' - CGTATG - 3'

  3' - GCATAC - 5'

• 5' - CGAATG - 3'

  3' - CGAATG - 5'

• 5' - GAATTC - 3'

  3' - CTTAAG - 5'

• 5' - GACTAC - 3'

  3' - TACGAC - 5'

Which of the following is true for a recessive disease in Family A and B?

• In family A, both the parents are homozygous recessive

• In family B, both the parents are heterozygous dominant.

• In family B, both the parents are heterozygous recessive

• In family A, both the parents are heterozygous recessive.

Which of the following is not true for inbreeding?

• It causes inbreeding depression after a few generations

• It always increases the productivity.

• It is used to produce a pure line.

• It leads to homozygosity