Multiple Choice QuestionsWhich 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.
B.
If both assertion and reason are true but reason is not the correct explanation of assertion
Formation of seeds without fertilization is called apomixis. It leads to clonal reproduction in which all offsprings are by and large genetically identical to the parent. The egg contains a full complement of genes and does not need to fuse with a sperm to produce a zygote. Apomixis provides for the perpetuation of traits favourable to individual survival but eliminates the longer-term evolutionary advantage of biparental inheritance. In Asteraceae, various genera and individual species of the order asterales are known to reproduce by apomixis (the setting of seeds without fertilization), either completely or in addition to normal sexual means.
In poaceae about 35 genera produce seeds without fertilization. On the other hand, parthenocarpy is development of fruits without fertilization. The fruit resembles a normally produced fruit but is seedless, e.g. pineapple, banana, cucumber, grape, orange, grapefruit etc.
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.
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