NEET BIOLOGY

Detailed explanation-1: -Assertion :The alternate type of phyllotaxy is the arrangement of leaves in which a single leaf arises at each node in alternate manner. Reason: The alternate type of phyllotaxy is seen in China rose and mustard plant.

Detailed explanation-2: -Alternate phyllotaxy: When only a single leaf is present at a node in an alternate pattern, it is referred to as alternate phyllotaxy. Such an arrangement of leaves can be observed in China Rose, Sunflower, and Mustard. >

Detailed explanation-3: -Alternate Phyllotaxy As per the name, the leaves are arranged in an alternate fashion. Here, only one leaf is present at a single node. This means each leaf will arise from a different node from the sides. Examples – Hibiscus, Sunflower, etc.

Detailed explanation-4: -(III) Whorled phyllotaxy: Whorled phyllotaxy is a type of arrangement in which more than two leaves arise at a node and form a whorl. Example – Alstonia, Nerium, etc. So, the order where plants show alternate, opposite and whorled phyllotaxy is China rose, Calotropis, and Nerium. Hence, option A is the correct option.

Detailed explanation-5: -Every node on the stem appears differently under the alternate phyllotaxy. On the opposite side, one leaf is positioned above the other. The rose plant exhibits this kind of phyllotaxy.