The Montreal Protocol refers to from Biology NEET Year 2006 Free

Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Plants of which one of the following groups of genera arc pollinated by the same agency

  • Triticum, Cocos, Mangifera

  • Ficus, Kigelia, Casuarina

  • Salvia, Morus, Euphorbia

  • Bombax, Butea, Bauhinia


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42.

The Montreal Protocol refers to

  • persistent organic pollutants

  • global warming and climate change

  • substances that deplete the ozone layer

  • biosafety of genetically modified organisms.


C.

substances that deplete the ozone layer

The montreal protocol on substances that deplete the ozone layer was signed in Montreal. Canada, by over 150 countries at a convention in 1987 to cut use of CFCs (chlorofluorocarbons). The aim of the Protocol was to protect the ozone layer in the stratosphere by decreasing and eventually eliminating the use of ozone-depleting substances (ODS) like CFCs. It is regarded as one of the most successful international treaties in modern history


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43.

Keystone species deserve protection because these

  • are capable of surviving in harsh environmental conditions

  • indicate presence of certain minerals in the soil

  • have become rare clue to overexploitation

  • play an important role in supporting other species.


44.

In India, we find mangoes with different flavours, colours, fibre content, sugar content and even shelf-life. The large variation is on account of

  • species diversity

  • induced mutations

  • genetic diversity 

  • hybridisation


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45.

During protein synthesis in an organism at one point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt.

  • UUU, UCC, UAU

  • UUC, UUA, UAC

  • UAG, UGA, UAA 

  • UUG, UCA, UCG     


46.

Biosphere reserves differ from National Parks and Wildlife sanctuaries because in the former

  • human beings are not allowed to enter

  • people are an integral part of the system

  • plants are paid greater attention than the animals

  • living organisms are brought from all over the world and preserved for posterity.


47.

Somaclonal variation is seen in

  • tissue culture grown plants

  • apomiets

  • polyploids

  • vegetatively propagated plants.


48.

Assertion: A person who has received a cut and is bleeding needs to be given anti-tetanus treatment.

Reason: Anti-tetanus injection provides immunity by producing antibodies for tetanus.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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49.

Assertion: Cancer cells are virtually immortal until the body in which they reside dies.

Reason: Cancer is caused by damage to genes regulating the cell division cycle.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


50.

Assertion: A network of food chains existing together in an ecosystem is known as a food web.

Reason: An animal like kite cannot be a part of a food web

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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