Download App

Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYBiodiversity and Conservation1 Mark
MCQ
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: The rate of extinction of organisms have increased in recent years.
Reason: Human activities like deforestation, industrialisation, etc., have destroyed the natural habitat of plants and animals.
  • ✓
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: A.
Both assertion and reason are true and reason is the correct explanation of assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Biodiversity and Conservation→Biodiversity and Conservation — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

FFor two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion :Mucous membrane immobilises the micro$-$organisms in the body
Reason: Microorganisms and dust particles entering the respiratory tract are trapped in the mucus.
→
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Alpha diversity refers to species diversity present in a given community or habitat.
Reason: Alpha diversity is expressed by species richness and species evenness in a community or habitat.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: All sexually transmitted diseases are completely curable if it is detected and treated properly in primary stage.
Reason: $\text{HIV}$ infection is completely curable with drugs like Zidovudine, Didanosine and Azidothymidine.
→
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Amensalism is a negative interaction between two living individuals.
Reason: In amensalism, allochemics are secreted by one individual.
→
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: There are $36$ biodiversity hotspots in the world.
Reason: High level of species richness is a criteria for selection of a biodiversity hotspot.
→
Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Bacterial cells are made competent by treating them with specific concentration of a divalent cation.
Reason: Treatment of bacterial cell with a divalent cation increases the efficiency with which $\text{DNA}$ enters the bacterium through pores in its cell wall.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Anemophily is non$-$directional.
Reason: Entomophily is highly specific and directional.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : There is no chance of transmission of malaria to man on the bite of a male Anopheles mosquito.
Reason: It carries a non$-$virulent strain of Plasmodium.
→
Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Curdling is required in the manufacture of cheese.
Reason: Lactic acid bacteria and rennet is used for the purpose.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: If several spermatozoa hit the egg at the same time, all can enter the egg.
Reason: The above process is called amphimixis which can be prevented by fertilisation membrane.
→