0

Reproduction in Animals

Description: bio
Number of Questions: 17
Created by:
Tags: bio Reproduction in Animals Reproduction
Attempted 0/17 Correct 0 Score 0

What is the number of chromosomes in the sperm of a Sahiwal bull?

  1. 30

  2. 60

  3. 50

  4. 120

  5. 20


Correct Option: A
Explanation:

Sperm contains half the number of chromosomes.

The end of diestrus period is due to

  1. recruitment of the ovulatory follicular wave

  2. decrease in estradiol negative feedback

  3. regression of the corpus luteum

  4. increase in estradiol levels coming from preovulatory follicle

  5. increase in progesterone level


Correct Option: C
Explanation:

Regression results in loss of progesterone support.

Why are Granulosa cells similar to Sertoli cells?

  1. Both have FSH receptors.

  2. Both have LH receptors.

  3. Both produce testosterone.

  4. Both have very low levels of cAMP.

  5. Both produce estrogen.


Correct Option: A
Explanation:

Both types of cells have FSH receptors.

Placentophagy is not seen in

  1. cats

  2. cows

  3. mares

  4. sows

  5. buffaloes


Correct Option: C
Explanation:

Mares are the only exception to placentophagy among these mammals. 

In bitches, lochia is of greenish colour due to

  1. biliverdin

  2. bilirubin

  3. uteroverdin

  4. urobilinogen

  5. carotene


Correct Option: C
Explanation:

It is the green lochia seen in postparturient bitches.

In case of a mare, honey-like drop and secretion appearing at teat before foaling is called

  1. colostrum

  2. weaning

  3. waxing

  4. preparturition dew

  5. dropping


Correct Option: C
Explanation:

It is only seen in mares before parturition.

In case of a mare, transition from non-breeding to breeding season is caused by

  1. decrease in melatonin

  2. decrease in the day length

  3. a switch from positive to negative feedback by estradiol

  4. the presence of progesterone coming from corpus luteum

  5. increase in melatonin level


Correct Option: A
Explanation:

It is a long day breeder.

Which of the following sterols is used for heat synchronisation in cows?

  1. PGF2alpha

  2. PMSG

  3. LH

  4. FSH

  5. Testosterone


Correct Option: A
Explanation:

PGF2alpha is used for heat synchronisation in cows because it causes regression of CL formed.

In trichomoniasis abortion, the cardinal sign is

  1. pyometra

  2. anoestrous

  3. repeat breeding

  4. CCF

  5. EDD


Correct Option: A
Explanation:

After abortion, there is a bacterial infection that results in accumulation of pus.

Which of the following fungi has anti-cancerous substance calcavin?

  1. Claviceps

  2. Clavatia

  3. Penicillium

  4. Streptomyces

  5. Pythium


Correct Option: B
Explanation:

The giant puff ball Clavatia contains an anti-cancer substance called calvacin. Eating of these fungus prevents stomach tumors.

Which of the following algae is used as a main source of agar agar?

  1. Gelidium

  2. Laminaria

  3. Chordrus

  4. Gloeopeltis

  5. Polysiphonia


Correct Option: A
Explanation:

Gelidium is one of the main sources of agar agar thalli. It is a mucilage produced by the red algae and stored along with cellulose in cell wall. Agar agar is used as a base for culture media for fungi, bacteria and algae.

In which of the following types of pregnancies, is the uterine torsion rare?

  1. Single

  2. Bovine

  3. Twin

  4. Surti buffalo

  5. None of these


Correct Option: C
Explanation:

Chances of distortion are more in this case because both horns are maintained at balance.

Which of the following options is a dangerous aspect of lichens?

  1. Lichens are used for dye preparation.

  2. Lichens are used as nitrogen fixers.

  3. Lichens are used as indicators of pollution.

  4. Lichens accumulate minerals and radioactive derivatives.

  5. Lichens are soil-forming organisms.


Correct Option: D
Explanation:

Lichens accumulate harmless minerals as well as radioactive derivatives of strontium and cesium, which are retained in high concentration. These isotopes get ingested by the animals feeding on it. When these animals are eaten by humans, it may reach at a dangerous level.

Certain species of lichens are used as a valuable source of food. Which of the following species is edible?

  1. Usnea

  2. Cetraria

  3. Chondrus

  4. Everina

  5. Gloeopeltis


Correct Option: B
Explanation:

Cetraria islandica is an edible species. The edible lichens are harvested and dried for human consumption.

Which of the following algae can be used as a food source in an anticipated space flight?

  1. Chlorella

  2. Turbinaria

  3. Anabaena

  4. Spirogyra

  5. Chara


Correct Option: A
Explanation:

Chlorella pyrenoidosa is a possible food source in an anticipated space flight. As a source of nitrogen for protein synthesis, it will assist in the decomposition of human waste like faeces and urine.

Which of the following options is the most important for rapid movement of oocyte to ampular-isthmic junction of oviduct after ovulation?

  1. Fluid production by isthmus

  2. Ciliary beating in ampulla

  3. Muscle contractions in ampulla

  4. Presence of cumulus cells surrounding oocyte at ovulation

  5. Oocyte’s own movement


Correct Option: C
Explanation:

Muscle contractions are vigorous and towards uterus at this time.

Bicornual transverse presentation is more common in

  1. cows

  2. buffaloes

  3. mares

  4. ewes

  5. sows


Correct Option: C
Explanation:

Bicornual transverse presentation is more common in mares due to migration of fetus from one horn to another.

- Hide questions