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

The Montreal Protocol refers to

• persistent organic pollutants

• global warming and climate change

• substances that deplete the ozone layer

• biosafety of genetically modified organisms.

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

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     

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.

Somaclonal variation is seen in

• tissue culture grown plants

• apomiets

• polyploids

• vegetatively propagated plants.

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.

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.

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.