Question

I. Pulvinus leaf base is present in some leguminous plants.
II. Whorled Phyllotaxy is seen in Calotropis.
III. In Australian Acacia, the petioles expand, become green, and synthesize food.
IV. A bud is present in the axils of leaflets of a compound leaf.
Of the above statements,
(a)I and IV correct, II, and III wrong.
(b)II and III correct, I and IV wrong.
(c)I and III correct, II, and IV wrong.
(d)II and IV correct, I and III wrong.

Answer 1

Hint: It is the main part of the plant involved in the manufacture of food. Phyllotaxy is the arrangement of leaves and the pulvinus leaf base has a cell mass in the leaf base.

Complete answer:
The swollen leaf base is called a pulvinus. It is present at the base or apex of the petiole. Pulvinus leaf base is usually seen in leguminous plants. Arrangement of leaves on the stem are called Phyllotaxy, Which is of three types, alternate, opposite and whorled. Opposite phyllotaxy is seen in Calotropis. The petioles expand, become green, and synthesize food in the case of Australian Acacia. This modified petiole is known as phyllode. A bud is present in the axil of a petiole of simple and compound leaves. It is not present in the axil of leaflets of the compound leaf.
Additional points:
- The pattern or arrangement of leaves on the stem or branch of a plant is called Phyllotaxy, which is of three types, alternate, opposite, and whorled phyllotaxy. In alternate phyllotaxy, a single leaf arises from the node of a branch alternatively. This type of phyllotaxy is observed in plants like sunflower, mustard, and peepal.
- A leaf during which the blade is split to the midrib, forming two or more distinct blades or leaflets on a standard axis which is named leaf.
So, the correct answer is 'I and III correct, II and IV wrong.'

Note:
- Pulvinus leaf base is present in leguminous plants.
- Whorled phyllotaxy is a type of phyllotaxy in which three or more leaves are present at one node.
- In Australian Acacia the petioles expand, become green, and synthesize food, forming a modification of a petiole known as phyllode.
- In both simple and compound leaves, a bud is present in the axil of the petiole but absent in the axil of leaflets of the compound leaf.