Assertion (A): Water is essential for photosynthesis. Reason (R): Water is split to release oxygen, and its hydrogen is used to reduce CO₂. MCQ with Answer and Explanation
Assertion (A): Water is essential for photosynthesis.
Reason (R): Water is split to release oxygen, and its hydrogen is used to reduce CO₂.
A. Both A and R are true, but R is not the correct explanation.
B. A false, R true.
C. Both A and R are true, and R is the correct explanation.
D. A true, R false.
Answer: Option C
Solution (By JKSSB Mock Tests)
Photolysis of water provides electrons and protons for the light reactions, releasing O₂; NADPH formed carries hydrogen to reduce CO₂ in the Calvin cycle. R correctly explains A.
Explanation:
Euglenoids are unicellular eukaryotic organisms that possess characteristics of both plants (chloroplasts for photosynthesis) and animals (lack of a cell wall and presence of a flagellum for movement). Due to their unique features and unicellular nature, they are classified under the Kingdom Protista.
Explanation:
Phagocytosis ('cell eating') is a type of endocytosis where the cell membrane extends pseudopodia around a solid particle (e.g., bacterium) and engulfs it into a phagosome, which later fuses with a lysosome for digestion. Pinocytosis is 'cell drinking' of fluids. Exocytosis is secretion. Osmosis is water movement across a membrane.
Explanation:
Secondary structure refers to local folding patterns like α-helices and β-sheets. Primary is amino acid sequence; tertiary is 3D folding; disulfide bonds are tertiary/quaternary; denaturation disrupts non-covalent bonds, not peptide bonds.
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