Multiple Choice QuestionsPlants 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.
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.
A.
If both assertion and reason are true and reason is the correct explanation of assertion
Tetanus is a serious and often fatal disease caused by the neurotoxin tetanospasmin which is produced by the gram positive obligate anaerobic bacterium Clostridium tetani. Infections begins when the bacteria are introduced into an open injury or wound where they produce tetanospasmin toxin which blocks messages from the spinal cord to the muscles, forcing muscles to go into severe spasm. Deep puncture wound or those with devitalized (dead) tissue are particularly prone to tetanus infection because the bacillus thrives in an anaerobic environment. Tetanus often begins with mild spasm in the jaw muscles (hence called lock jaw or trismus), neck muscles and facial muscles. Stiffness rapidly develops in the chest, back and abdominal muscles. Immunization against tetanus can prevent the disease. Therefore a person who has received a cut and is bleeding needs to given antitetanus treatment. Antitetanus immunoglobin gives passive immunity. Tetanus is best prevented by active immunization with tetanus toxoid which stimulates the production of protective antitoxin.
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.
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