Which 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 elements is present in very less quantity in the body

• K

• Ca

• Mg

• Cu

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.

19.

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.