MCQ ON ISOLATION class 12 for NEET | ISOLATION class 12 | MCQ ISOLATION with Answer | Check the below NCERT MCQ question for class 12 Biology based on the with Answers.
MCQ on ISOLATION class 12 Biology with answers were prepared based on the latest pattern.We have provided class 12 Biology MCQs questions on ISOLATION with Answers to help students understand the concept very well.
MCQ ON ISOLATION is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM 2022-23, 2023-24
Introduction:
Evolutionary biology is the study of history of life forms on earth.To understand the changes in flora and fauna that have occurred over millions of years on earth , we must have an understanding of the context of origin of life , of stars, of earth and indeed universe itself.This is the story of origin of life and evolution of life forms or biodiversity on planet earth in the context of evolution of earth and against the background of evolution of Universe itself. Evolution is revealing of hidden potential ties that bring about an orderly change from one condition to another.Cosmic evolution deals with the sequence of changes that occur in inorganic matter and its evolution. Isolation is preventing of mating between otherwise inter breeding groups due to physical and biotic barriers. the barriers allow isolated groups to evolve into distinct populations . ISOLATION mechanism are of two types premating and post mating while premating isolation develops due to appearance of barriers by Natural selection, post mating isolation is cause of genetic changes.
MCQ ON ISOLATION class 12 for NEET
1. it is prevention of meeting between otherwise inter breeding groups due to physical and biotic barriers. The barriers allow isolated groups to evolve into distinct populations is
(a) natural selection
(b) mutation
(c) genetic drift
(d) isolation
Ans (d) isolation
2. Isolation mechanism are of types
(a) two
(b) three
(c) four
(d) five
Ans. (a) two
3. While premating isolations develops due to appearance of barrier by
(a) mutation
(b) genetic bottle neck effect
(c) natural selection
(d) genetic drift
Ans. (c) natural selection
4. Post mating isolation is caused by appearance of
(a) increase in inbreeding
(b) decrease in heterogosity
(c) genetic changes
(d) mutation
Ans.(c) genetic changes
5. Darwin fences develops into distinct species due to
(a) geography isolation
(b) ecological isolation
(c) mechanical isolation
(d) physiological isolation
Ans.(a) geography isolation
6. Pheromons are used to repell animals of other races their can be adverse physiological reaction due to
(a) geographical isolation
(b) physiological isolation
(c) ecological isolation
(d) ethological isolation
Ans.(a) geographical isolation
7. Differences in genitalia in animal or pollina in plants result in the reproductive isolation due to
(a) is random change in gene frequency
(b) mechanical isolation
(c) ecological isolation
(d) ethological isolation
Ans.(b) mechanical isolation
8. Post mating isolation occurs due to
(a) zygotic mortality
(b) hybrid invibility
(c) hybrid sterility
(d) all the above
Ans.(d) all the above
9. Zygotic mortality means
(a) zygote dies soon after formation
(b) fusion of gametes
(c) non fusion of gametes
(d) all the above
Ans. (a) zygote dies soon after formation
10. Hybrid in viability means
(a) hybrid dies before reaching sexual maturity
(b) random drift
(c) Non fusion of gametes
(d) zygote dies soon after formation
Ans. (a) hybrid dies before reaching sexual maturity
11. Hybrid sterility means
(a) hybrid fails to reproduce sexually
(b) non fusion of gametes
(c) hybrid dies before sexual maturity
(d) none of the above
Ans.(a) hybrid fails to reproduce sexually
12. Ligon is fertile hybrid between
(a) African lioness and Asian tiger
(b) African lion and Asian tigress
(c) African lion and Asian tigress
(d) African lioness and Asian tiger
Ans . (c) African lion and Asian tigress
13. Tigon is fertile hybrid between
(a) African lioness and Asian tiger
(b) African lion and Asian tigress
(c) African lioness and Asian tigress
(d) none of the above
Ans.(a) African lioness and Asian tiger
15. Individuals present at 2 ends of avoid range of population seldom interbrid developed different variations and ultimately become reproductively isolated due to different timing of maturity meeting body pattern song is
(a) geographical isolation
(b) spatial isolation
(c) ecological isolation
(d) physiological isolation
Ans. (b) spatial isolation
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16. Isolation produces different gene pool for separated populations which evolve further bring about reproductive isolation
(a) geographical environmental isolation
(b) genetic flow
(c) genetic drift
(d) random mating
Ans.(a) geographic environmental isolation
17. Selection in a population subject to rapid changing environments with highly fluctuating food sources is called
(a) stabilising selection
(b) k-selection
(c) r-selection
(d) Disruptive selection
Ans.(d) Disruptive selection
18. Isolation leads to
(a) species differentiation
(b) evolutionary divergence
(c) formation of analogous structure
(d) formation of similar traits
Ans.(a) species differentiation
19. Which is an important factor for speciation and governs the percentage of endemism in area.
(a) geographical isolation
(b) reproductive isolation
(c) physiological isolation
(d) mechanical isolation
Ans. (a) geographical isolation
20. Genetic incompatibility is
(a) Non fusion of gametes
(b) genetic drift
(c) gene flow
(d) intra specific breeding
Ans.(a) non fusion of gametes
21. Hybrid breakdown means
(a) hybrid is fertile but it’s offspring and progeny from back cross have low fertility
(b) random mating
(c) selection
(d) mutation
Ans.(a) hybrid is fertile but it’s offspring and progeny from back cross have low fertility
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