Respiration in Plants Question 49
49. Poisons like cyanide inhibit $Na^{+}$efflux and $k^{+}$ influx during cellular transport. This inhibitary effect is reversed by an injection of ATP. This demonstrates that [1994]
(a) ATP is the carrier protion in the transport system.
(b) energy for $Na^{+}-k^{+}$exchange pump comes from ATP.
(c) ATP is hydrolysed by ATP to release energy.
(d) $Na^{+}-K^{+}$exchange pump eperates in the cell.
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Answer : a
Hints & Solutions
(a) Active transport is the uphill movement of particles against their concentration gradient. Energy is utilised in the form of energy. Cyanide inhibits soluble absorption by lowering respiration rate leading to formation of less ATP. Addition of ATP facilities active transport. Immediate ATP supply minimise the effect of cyanide in normal aerobic respiration.
