Question

Assertion: In opposite phyllotaxy two leaves are borne on the opposite sides of a single node.

Reason: Opposite phylotaxy is seen in china rose and oleander.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

The correct option is C If assertion is true but reason is false

Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. Three types of phyllotaxy are found – alternate, opposite and whorled.

In alternate type of phyllotaxy, a single leaf arises at each node in alternate manner, e.g., china rose.

In opposite type, a pair of leaves arise at each node and lie opposite to each other, e.g., Calotropis.

If more than two leaves arise at a node and form a whorl, it is called whorled, e.g., oleander.