CBSE 12th Standard Biology Subject Environmental Issues Value Based Questions 5 Marks Questions With Solution 2021
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CBSE 12th Standard Biology Subject Environmental Issues Value Based Questions 5 Marks Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Biology
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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 contacted the local eco-club and approached the concerned department to stop the work.
(i) What would be effect on biodiversity, if the highway is constructed?
(ii) How forests 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 heating 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 Alok an indisciplined boy, who did not run to the class on seeing the principal? What values does the acts 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 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) How can biodiversity be conserved?
(iii) What international initiatives were taken to conserve biodiversity?
(iv) What values did Rajesh possess?(a) -
On his visit to 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) what values are shown by Harshendra's friend?(a) -
Mohan and Sohan established a factory in partnership. It was running all well but after a few months its electrostatic precipitator suddenly got out of order and stopped working. Mohan made up his mind to replace it with the new one but Sohan didn't agree to Mohan's proposal and said that they should not waste money in replacing it because it has no effect on productivity and income. Answer fo owing questions on the basis of above information:
(i) Out of the two partners whome you will support and why?
(ii) What measures could you suggest to stop such a negligence?
(iii) What values are exhibited by Sohan?(a)
5 Marks
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CBSE 12th Standard Biology Subject Environmental Issues Value Based Questions 5 Marks Questions With Solution 2021 Answer Keys
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(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) Forest 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 provide 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 environment conciousness. She was brave, focussed, and foresighted (had vision to see he disaster in the future.) -
(iii) No, Alok was a brave and courteous boy. He expressed his love for animals, commitment towards natural resources and their conservation.
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(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 Scared plants, home gardens, seed banks, gene bank, cryopreservation, botanical garden, zoological garden and aquariums.
(iii) For conserving biodiversity, the Earth Summits was held in 1992 and World Summits was held in 2002.
(iv) Respect for nature, scientific attitude with a vision of the future. -
(i) National Park belongs to In situ conservation method.
(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. -
(i) Sohan's thinking and approach is eco-friendly, therefore I will support him.
(ii) Following measures may be taken to stop such a negligence.
(a) Imposing fine as punishment.
(b) Cancellation of registration of such factores
(iii) Values shown by Sohan-
(a) Concern about environment
(b) Awareness
(c) Decision making.
5 Marks
