CBSE 12th Standard Biology Subject Biodiversity and Conservation Value Based Questions 3 Marks Questions 2021
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CBSE 12th Standard Biology Subject Biodiversity and Conservation Value Based Questions 3 Marks Questions 2021
12th Standard CBSE
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Reg.No. :
Biology
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Sanctuaries are tracts of land where animals are protected from all types of exploitation. Private ownership is permitted. Collection of minor sanctuaries are present in India?
(i) How many sanctuaries are present in India?
(ii) How much land area they cover?
(iii) Name any three sanctuaries.
(iv) List any three human activities are allowed in sanctuaries.(a) -
During her tour to a renowned forest, Sakshi saw a highway being constructed, which passes through the middle of the forest. She was unhappy seeing that and on return, she I contacted the local eco-club and approached the concerned department to stop the work.
(i) What would be the effect on biodiversity, if the highway is constructed?
(ii) Howforests are useful to mankind?
(iii) What values of Sakshi reflect here?(a) -
Seeing a crowd of students in one corner of the school: the principal rushed to see the matter and found some children beating and chasing a small lizard. On seeing the principal, all the children fled to their classes except Alok who requested the principal to arrange for some medical assistance for the injured animal. The principal rewarded Alok for his attitude to save guard our biodiversity.
(i) What do you understand by biodiversity?
(ii) Mention the factors resulting in loss of biodiversity.
(iii) Was Alokan indisciplined boy,who did not run to the class on seeing the principal? What values does the act promote?(a) -
During an excursion to a botanical garden, the teacher shows an old tree, which was on the verge of extinction. As soon as the teacher advanced with the students, some enthusiastic students climbed up the tree and started cutting the branches, collecting its leaves as precious collection. Rajesh instead took photographs of the tree from various angles. The boys mocked at Rajesh while the teacher appreciated him.
(i) Why should we conserve biodiversity?
(ii) Howcan biodiversity be conserved?
(iii) What international initiatives were taken to conserve biodiversity?
(iv) What values did Rajesh possess?(a) -
On his visit to a national park; Harshendra was very angry as the forest authorities did not allow him to enter a specified area. On returning back, he discussed the matter with his friend, who explained him the reason.
(i) Which category of conservation strategy does national park belong?
(ii) Name India's first national park.
(iii) At present, there are how many national parks in India?
(iv) Whatvalues are shownby Harshendra's friend?(a)
5 Marks
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CBSE 12th Standard Biology Subject Biodiversity and Conservation Value Based Questions 3 Marks Questions 2021 Answer Keys
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(i) India has 551 sanctuaries.
(ii) 3.6% geographical area.
(iii) (a) Keoladeo Ghana Bird Sanctuary, Bharatpur, Rajasthan
(b) Sultanpur Lake Bird Sanctuary, Gurgaon, Haryana
(c) Periyar Sanctuary, Kerala
(iv) (a) Collection of forest products
(b) Harvesting of timber
(c) Tilling of land
(d) Private ownership of land. -
(i) Continuity of the habitat (i.e. forest) would be disrupted. Animals get confined to smaller area. Fragmentation characteristically reduces species richness and taxon diversity and may reduce the efficacy of ecosystem functioning. Fragmentation not only reduces the amount of functional habitat, but also it may isolate a species population into sub-populations. It may be sufficiently near the minimum viable population size, to risk the , local extinction from successive demographic processes or catastrophic events.
(ii) Forests are important for mankind due to following reasons
(a) They are source of firewood, fibre, construction material, industrial products and products of medicinal importance.
(b) They proxide us with fresh air (oxygen) and also help in bringing down rain.
(c) Acts as a habitat of a wide variety of flora and fauna.
(d) They also help in keeping environment healthy and beautiful.
(iii) Love for nature and environmental consciousness. She was brave, focussed, and foresighted (had vision to see the disaster in the future). -
(ii) There are four major factors that results in loss of bidiversity and these are
(a) Habitat loss and fragmentation
(b) Over-exploitation.
(c) Alien species invasion
(d) Co-extinction
(iii) No, Alok was a brave and courteous boy. He expressed his love for animals, commitment towards natural resources and their conservation. -
(ii) Biodiversity can be conserved in the following two ways In situ conservation Sacred groves, biosphere reserves (terrestrial and marine), national parks and wildlife sanctuaries, etc. Ex situ conservation Sacred plants, home gardens, seed banks, gene bank, cryopreservations, botanical garden, zoological garden and aquariums.
(iii) For conserving biodiversity, the Earth Summit was held in 1992 and World Summit was held in 2002.
(iv) The values possessed by Rajesh are respect for nature, scientific attitude with a vision of the tuture. -
(i) National Park belongs to in situ conservation methodrt
(ii) First national park of India is Haileys National Park which is now called as Jim Corbett National Park.
(iii) According to National Wildlife Database Cell, Wildlife Institute of India, there are 103 national parks till now.
(iv) His friend is calm and has knowledge about biodiversity.
5 Marks
