AIIMS Zoology Class 12 Questions

Assertion : Soframycin is applied to diseased skin surface and wounds.

Reason : Soframycin is an antibiotic.

Which of the following are homosporous

Match the following:

Assertion : Heterospory and retention of female gametophyte are responsible for origin of seed habit in Selaginella

Reason: Psilotum is a living fossil

Plasmid of which bacterium was first time used in recombinant DNA technology?

Assertion: Isolated protoplasts are used for somatic hybridisation Reason: Callus culture does not allow variation

Choose the correct option

Choose the correct

Choose the correct statement

Choose the correct one

Hardy Weinberg equilibrium is affected by-

Assertion : Escherichia coli, Shigella sp. and Salmonella sp. are all responsible for diarrhoeal diseases.

Reason : Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids and electrolytes should be ensured.

Assertion: Species are groups of potentially interbreeding natural populations which are isolated from other such groups.

Reason: Distinctive morphological characters are displayed due to reproductive isolation.

Assertion: 2.5µm or less than 2.5µm size of SPM is harmful for health.

Reason: Large particles are filtered by nasal cavity & throat

Mark the correct statement

Assertion: There is hyperglycemia in DM type II.

Reason: Insulin injections are essential for treatment.

Assertion: Cannabinoids are drugs of abuse.

Reason: They affect cardiovascular system and Central nervous system activity.

Assertion: Iodine deficiency may lead to irregular menstrual cycle

Reason: Estrogen and progesterone level becomes low

Assertion: Deficiency of an element may lead to scurvy.

Reason: Daily requirement of ascorbic acid is 5 mg/day

Assertion : Parturition is induced by neural signal in maternal pituitary.

Reason : At the end of the gestation period, the maternal pituitary releases prolactin which cause uterine contractions.

Assertion: Opioids are used as drugs of abuse Reason: These slow down metabolism and produce hallucinations

Assertion: Amount of cyanocobalamine required daily is 3 mcg Reason: Its deficiency causes pernicious anaemia

Assertion : IUT is the transfer of embryo with more than 8 blastomeres into the fallopian tubes.

Reason : This is a very popular method of forming embryos in vivo.

Assertion: In MOET, hormones with progesterone like activity are given to the cow to induce superovulation.

Reason: After mating, the embryos at 4-6 celled stages are recovered and transferred to surrogate mothers.

Ploidy level of Nucellus, endosperm, polar nuclei, Megaspore mother cell, female gametophyte respectively are

What was the reason for mass extinction during the Mesozoic era?

Which hormone helps in detection of pregnancy?

Which of the following condition is true at the time just after ovulation?

Which of the following explained evolution in most acceptable form?

The correct sequence of steps in a Polymerase Chain Reaction (PCR) cycle is:

Radioactive C⁻dating and living fossils are used for-

Fibroid (leiomyoma) uterus is a-

Meiosis II in ovum doesn't completes until –

How is Ascariasis transmitted?

Which of the following contraceptive also provides protection from contacting STDs and AIDS ?

Assertion: Organism that reproduce by binary fission are immortal Reason: Such organism have special kind of rejuvenation capability.

Assertion: Barrier methods prevent physical meeting of sperms and ova. Reason: This prevents conception.

Typ$e^{-1}$ diabetes is -

Assertion: Lumbricus and Nereis both belong to Annelida.

Reason: They have nephridia.

Assertion: In females, parturition occurs after the pregnancy. Reason: Signal for parturition originates from fully developed embryo.

Assertion: Cu T is a intrauterine device Reason: It decreases sperm motility.

Assertion: AIDS occurs by retroviruses whose RNA is enveloped. Reason: It enters into the cell & forms new viruses.

Assertion: Baculovirus are used as biocontrol agent Reason: Baculovirus are used in ecologically vulnerable areas

Reproductive isolation in sympatric speciation develops without a

Gemmule formation is a common mode of asexual reproduction in

From the statements given below, which one most likely represents an example of disruptive selection. I. Industrial melanism in peppered moth. II. Population of butterflies that are either all yellow or all blue. III. Population of rabbits that evolves more body fat in response to a cold climate. IV. Population of wrens that evolves to be smaller at sexual maturity in response to predation pressure.

The best description of natural selection is

Read the Assertion and Reason carefully to mark the correct option from those given below Assertion Endosperm is formed by the fusion of one male gamete and two polar nuclei. Reason In pea, the endosperm remains the part of seed as it is not completely used up during embryo development.

The fluid which is rich in calcium èbrinolysin and acid phosphatase and contributes about 30% of the total volume of semen, is released by

Read the Assertion and Reason carefully to mark the correct option from those given below Assertion The technique shown in the given figure is frequently used in prenatal disease treatment. Reason This technique cannot be used for sex-determination of child.