Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. Assertion: The decapitated (tip-removed) coleoptile of canary grass continues to bend towards a unilateral light source. Reason: The tip of the coleoptile is the site of production of a transmittable influence that causes the bending of the entire coleoptile. In the light of the above statements, choose the correct answe

Step-by-step solution

The Assertion is false because the decapitated coleoptile of canary grass fails to bend towards a unilateral light source. Charles Darwin and Francis Darwin observed that the tip of the coleoptile perceives the light stimulus. The Reason is true because they concluded that the tip of the coleoptile is the site of a transmittable influence (later identified as auxin) that causes the bending of the entire coleoptile. When the tip is removed, this influence is absent, and phototropism does not occur. Answer: Assertion