Oat Seedlings are Sometimes Used to Study Auxins Because

Question

Oat seedlings are sometimes used to study auxins because
A) they are a readily accessible monocot, and auxins affect only monocots.
B) they have a stiff coleoptile.
C) they green rapidly in the light.
D) their coleoptile exhibits a strong positive phototropism.
E) monocots inactivate synthetic auxins.

Accepted Answer

Oat seedlings are commonly used in studies involving auxins because their coleoptile (the protective sheath covering the emerging shoot) shows a strong positive phototropism, meaning it grows towards light. This characteristic makes it easier to observe and measure the effects of auxins, which are plant hormones that play a crucial role in directing plant growth towards light.