Zoology Assertion and Reason type objective questions for UPSC exams

Zoology Assertion and Reason type objective questions for UPSC exams
Zoology Quiz MCQ Objective type Assertion reason for UPSC


Directions The following questions consist of two statements, one labelled the Assertion (A) and the other labelled the Reason (R). You are to examine these two statement carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the reason is correct explanation of the Assertion. Select you answers to these questions using the codes given below and mark our answer sheet accordingly.
(a) Both A and Rare true and R is the correct explanation of A.
(b) Both A and R are true but R is not a correct explanation of A.
(c) A is true but R is false,
(d) A is false but R is true.

1. Assertion (A): The synthesis (anabolism) and degradation (catabolism) of protoplasm deals largely with protein metabolism.
Reason (R): Proteins generally form the major constituent of living matter.
Ans. (a)

2. Assertion (A): In starvation and diabetes, the concentration of Free Fatty Acids (FFA) in the blood increases.
Reason (R): The fatty acids circulate in blood in combination with plasma albumin.
Ans. (d)

3. Assertion (A): In spite of sufficient insulin being secreted by the islets of Langerhans, diabetes mellitus may strike an individual.
Reason (R): The number of insulin receptors on the target cells decreases due to a negative feed back mechanism.
Ans. (c)


4. Assertion (A): In metamorphosis tadpole of frog, the tail material is gradually accumulated in the body region and thus helps in disappearance of the tail.
Reason (R): Lysosomes become highly active in the tail region of tadpole.
Ans. (a)

5. Assertion (A): Monocystis and Plasmodium are included in the class Sporozoa.
Reason (R): Both these genera are internal parasites.
Ans. (b)

6. Assertion (A): Blood of Pheretima is red.
Reason (R): Hemoglobin occurs in the blood corpuscles.
Ans. (c)

7. Assertion (A): Feathers of Columba are water proof.
Reason (R): They are lubricated by secretion of the buccal gland.
Ans. (c)

8. Assertion (A): Frog has large optic lobes whereas their counterpart in rabbit is much smaller.
Reason (R): In rabbit, the function of optic lobes is carried out by the cerebrum.
Ans. (c)

9. Assertion (A): Calciferol is antagonistic to calcitonin.
Reason (R): Calciferol is synergistic to parathormone.
Ans. (d)

10. Assertion (A): The immediate administration of nitrite is a highly effective treatment for cyanide poisoning.
Reason (R): Nitrite converts ferrohaemoglobin to ferrihaemoglobin, which also binds cyanide. Thus, ferrihaemoglobin competes with cytochrome oxide for cyanide.
Ans. (a)

11. Assertion (A): On the yearly basis, the net community production in a mature rain-forest tends to be very low or none.
Reason (R): In steady state communities the gross primary production tends to be totally dissipated by the combined autotrophic and heterotrophic respirations.
Ans. (d)

12. Assertion (A): Ethylene oxide has been used as an insecticide.
Reason (R): Ethylene oxide is an anti-cholinesterase.
Ans. (d)

13. Assertion (A): Mental and motor retardation and death by ages 2-4 years are phenotypic effects in the individuals of Tay-Sachs disease.
Reason (R): In the individuals of Tay-Sachs disease galactose-l-phosphate uridyl 1-transferase fails to catalyze transformation of galactose into glucose.
Ans. (c)


14. Assertion (A): The crop milk is produced by both male and female Columba livia.
Reason (R): The males of his species have special milk producing glands.
Ans.(c)

15. Assertion (A): Adults are globular in Asteroidea and Echinoidea but cylindrical in Holothuroidea.
Reason (R): Relative development of ambs and interambs determines the shape of the adult body in echinoderms.
Ans. (d)

16. Assertion (A): Hydra, Obelia, Aurelia and Adamsia belong to Ctenophora.
Reason (R): They exhibit radial symmetry are diploblastic and have nematocyst.
Ans. No option is correct

17. Assertion (A): After the addition of the last amino acid to a growing polypeptide chain the protein synthesis stops.
Reason (R): The termination codon reacts with release factor(s) and the resultant RF-terminator codon ribosome complex effectively blocks further chain elongation.
Ans. (a)

18. Assertion (A): In respiratory acidosis there is an elevation of arterial CO2 and H.
Reason (R): In hypoventilation CO2 is not eliminated as fast as it is produced.
Ans. (a)

19. Assertion (A): In their role of constricting the arterioles, the effect of vasopressin lasts much longer as compared to the effect adrenaline.
Reason (R): Vasopressin is an amine whereas adrenaline is a polypeptide.
Ans. (c)

20. Assertion (A): Approximately 90% of eukaryotic DNA is not transcribed and translated and lies apparently functionless and dormant.
Reason (R): Natural selection operated to weed out apparently unnecessary DNA.
Ans. (c)

21. Assertion (A): Mitochondrion contains one double stranded circular DNA.
Reason (R): DNA carries genes for all the proteins needed for its functioning.
Ans. (c)

22. Assertion (A): A nucleus taken from a somatic cell and implanted into an enucleated egg cell of a frog often gives rise to an adult individual1
Reason (R): Differentiated donor nucleus could be totipotent.
Ans.(a)

23. Assertion (A): Spontaneous mutation involves base pair substitutions during DNA replication.
Reason (R): It is temperature sensitive mutation and changes the base pair.
Ans. (d)

24. Assertion (A): Using recombinant DNA technology, desired genes can be implanted into a bacterium for amplification and expression.
Reason (R): Any bacterium can carry expression vector.
Ans.(c)

25. Assertion (A): During protein synthesis, peptide bond formation is a dehydration reaction.
Reason (R): Peptide bond formation is done by sharing of electrons between a carboxyl carbon of one amino acid and an amino nitrogen of another amino acid.
Ans. (b)