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CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 3 Marks Questions With Solution 2021

Published on: 29/05/2021

QB365 Provides the HOT Question Papers for Class 12 Biology, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology

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Std: 12th Standard CBSE - Biology

chapter: - HOT Questions

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Questions:

Generic 3

5 x 3 = 15

From among plants, invertebrates and vertebrates, list respectively those taxa which occur maximum in numbers at present.

(a) What are hot spots of biodiversity?
(b) List four main criteria for determining a particular place as a hot spot.
(c) Among the hot spots of the world, list two which are located in India.

How is the 'sixth episode of extinction' of species on earth, now currently in progress, different from the five earlier episodes? What is it due to? Explain the various causes that have brought about this difference.

In the pie charts (A) and (B) drawn below to show the global animal diversity, which groups of animals would you name and write on the area shaded black in (A) and (B). In which kind of habitat would you find these groups of animals?

(i) The graph given alongside represent the growth patterns of two types of aquatic organisms over a brief period of times in a water body surrounded by an agricultural land extensively supplied with fertilisers.Identify the organisms that would represent (i) A and (ii) B.
(ii) State the reason for such a change in the water body and also write the term given to it.

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Answers Key:

Generic 3

5 x 3 = 15

Plants - Angiosperms
Invertebrates - Insects
Vertebrates - Fishes.

(a) Hot spots are the regions of rich biodiversity which have been declared sensitive due to direct or indirect interference of human activities
(b) Four main criteria are-
(i) Rich species diversity
(ii) Number of endemic species
(iii) Degree of threat in terms of habitat loss, and
(iv) Degree of exploitation.
(c) Western ghats and Eastern Himalayas.

Sixth episode of extinction will be due to the climatic changes that would kill the biodiversity. Five earlier episodes that became extinct today are :
(i) early reptiles,
(ii) pelycosaurs
(ii) thecodonts,
(iv) therapsids,
(v) dinosaurs.
The sixth episode contains turtles, snakes, tautaras, crocodiles, birds and mammals. Some are facing danger and are very near to extinction. For instance, population of white Bengal tiger due to unlimited hunting ; The land reptiles.

(A) (1) Shaded area = Insects (Habitat-Aerial; terrestrial, aquatic).
(B) Shaded area = fishes (Habitat-Aquatic).

(i) A - Fish B - Algae
(ii) (a) Presence of large amount of nutrients in water
(b) Algal bloom