Assertion (A): Oxygen is required for aerobic respiration. Reason (R): Oxygen acts as the final electron acceptor in the electron transport chain. MCQ with Answer and Explanation
Assertion (A): Oxygen is required for aerobic respiration.
Reason (R): Oxygen acts as the final electron acceptor in the electron transport chain.
A. A true, R false.
B. Both A and R are true, and R is the correct explanation.
C. Both A and R are true, but R is not the correct explanation.
D. A false, R true.
Answer: Option B
Solution (By JKSSB Mock Tests)
In aerobic respiration, oxygen accepts electrons at the end of the ETC, forming water. Without it, the chain would halt. This directly explains why oxygen is required.
Explanation:
Veins have thinner walls than arteries and contain valves. The pulmonary artery carries deoxygenated blood, and arteries normally (except pulmonary) carry oxygenated blood.
Explanation:
Fungi are heterotrophic organisms; they cannot perform photosynthesis because they lack chlorophyll and chloroplasts. They obtain nutrients through absorption after extracellular digestion (saprophytic or parasitic). The cell wall contains chitin, and most are multicellular with a filamentous body (mycelium), though yeasts are unicellular. Thus, autotrophy is not a fungal characteristic.
Explanation:
Natural passive immunity is transferred from mother to child via placental transfer of IgG antibodies (in utero) and IgA antibodies in breast milk (colostrum). It provides temporary protection without the infant's immune system being activated. Active immunity results from natural infection or vaccination.
No comments yet. Be the first to start the discussion!