51.

Which of the following features can be said to be a true defining feature of living beings without any exception

• They can digest their food.

• All of them can reproduce.

• They can regenerate.

• They can respond to external stimuli.

Assertion: In some species of asteraceae and poaceae seeds are formed without fertilization.

Reason: Formation of fruit without fertilization is called parthenocarpy.

• 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: Algal blooms are formed in nutrientless water.

Reason: Algal blooms in water turn it unfit for human consumption, but cause enormous growth of fish.

• 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 mangrove tree growing in marshy place has pneumatophores.

Reason: Pneumatophores help in better anchorage to marshy soil.

• 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 geneticist crossed two plants, he got 50% tall and 50% dwarf progenies.

Reason: It follows Mendelian law as one of the parent plant might be heterozygous.

• 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: Now-a-days amniocentesis is banned.

Reason: Amniocentesis gives the information of any abnormality in the foetus and many other complications regarding pregnancy can be detected.

• 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 gene from Bacillus thuringiensis is incorporated in plant genome to increase their yield.

Reason: Bacillus thuringiensis has Bt toxin producing gene, which kills the larva of insects

• 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: Blood group 'O' have anti-A & antiB antibodies.

Reason: It does not have any antigens.

• 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: Corpus luteum is produced by Graafian follicle after ovulation.

Reason: It secretes estrogen which is necessary to maintain pregnancy.

• 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: Sporozoites of malarial parasite enter in the human body due to biting of freshly born female Anopheles mosquito, whose mother was a carrier of malarial parasite.

Reason: Male and female gametocytes of malarial parasites are formed in the human intestine

• 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.