41.

The treatment of snake-bite by antivenom is an example of

• artificially acquired active immunity

• artificially acquired passive immunity

• naturally acquired passive immunity

• specific natural immunity.

DNA is present in

• chromosomes and dictyosomes

• chloroplasts and lysosomes

• mitochondria and chloroplasts

• mitochondria and endoplasmic reticulum.

Potato and sweet potato

• have edible parts which are homologous organs

• have edible parts which are analogous organs

• have been introduced in India from the same place

• are two species of the same genus.

Somaclonal variation can be obtained by

• application of colchicine

• irradiation with gamma rays

• tissue culture

• hybridisation.

Which of the following is the largest root parasite

• Rafflesia

• Monotrapa

• Areuthobium

• Pistia

How many different types of gametes can be formed by F₁ progeny, resulting from the following cross

AA BB CC x aa bb cc

• 3

• 8

• 27

• 64

Assertion: Agricultural output increased several times after introduction of DDT.

Reason: DDT was the first insecticide used on a wide scale.

• 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: Coaccrvates are believed to be the precursors of life.

Reason: Coaccrvates were self-duplicating aggregates of proteins surrounded by lipid molecules

• 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: Tapeworm, roundworm and pinworm are endoparasites of human intestine.,

Reason: Improperly cooked food is the source of all intestinal infections.

• 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: Fish meal is a rich source of protein for cattle and poultry.

Reason: Fish meal is produced from non-edible parts of fishes like fins, tail etc.

• 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.