Multiple Choice QuestionsWhich of the following statements is correct
Photorespiration is useful process.
C4 plants are more efficient than C3 plants.
C3 plants are more efficient than C4 plants.
Photorespiration is absent in C3 plants but present in C4 plants.
Which of the following statements is incorrect regarding fermentation
Propionibacterium is used to ferment the cheese.
The puffed-up appearance of dough is due to the production of CO2 gas.
Fermentation in muscle produces ethanol.
Toddy is made by fermenting sap from palms.
Which of the following statements is correct
Aspergillus niger is used for producing cyclosporin A.
Activated sludge is digested by aerobic bacteria to produce marsh gas.
Fleming, Chain & Florey were awarded with Nobel Prize for discovering penicillin.
BOD is amount of oxygen produced by bacteria on decomposition.
Which of the following is not a characteristic of meiosis
It involves two stages of DNA replication one before meiosis-I and another before meiosis-II
It involves recombination and crossing over
Sister chromatids separate during anaphase II
Nuclear membrane disappears during prophase.
Which statement is correct regarding mosses
They have dominant and independent sporophyte.
Their antherozoids require water for fertilization.
Their archegonia produce many eggs.
Their antherozoids are multiflagellated
Kingdom Animalia is characterised by
direct dependence on autotrophs
indirect dependence on autotrophs
absence of chlorophyll
absence of cell wall.
Assertion: Enzymes lower down the activation energy of the reactant molecule to make its transition into product easier.
Reason: Enzymes are highly substrate specific catalysts.
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
Enzymes are highly substrate specific i.e. they catalyze the reaction of a particular substrate only. They facilitate occurrence of a reaction and transition of reactant into product.
A chemical reaction SP (where S is the substrate and P the product or products) will take place when a certain number of S molecules at any given instant possess enough energy to attain an activated condition called the 'transition state'. The enzyme combines transiently with the substrate to produce a transient state having a lower energy of activation than that of substrate alone. This results in acceleration of the reaction. Once the products are formed, the enzyme (or catalyst) is free or regenerated to combine with another molecule of the substrate and repeat the process.
Assertion: Water that enters into a plant cell through diffusion makes it turgid.
Reason: Entry of water into the cell through diffusion develops wall pressure inside the cell.
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: Movement of materials inside phloem is bidirectional i.e. it can be both upwards or downwards.
Reason: Movement of molecules inside xylem is unidirectional i.e. always upwards.
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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