Question

Anthophore is an internode between
a. Two opposite leaves in spiral phyllotaxy
b. Calyx and corolla
c. Corolla and androecium
d. Androecium and gynoecium

Answer 1

Hint: The short abbreviated axis that bears four sets of floral leaves is called the thalamus. The internodes are compressed by the four nodes with a peduncle and it will be swollen at the end. The receptacle in which the extension is stalk-like is called Anthophore.

Complete answer:
> Option B:
The internode in Anthophore is present between the calyx and corolla. It is a type of distinct passion-flower. In the thalamus of some flowers, the intermodal regions can enlarge and be visible in between the different whorls of the floral organs. For example – Silene, passiflora, dianthus, etc. It is also known as anthophorum.

> Option A:
The floral meristem components are not found in the two opposite leaves in spiral phyllotaxy. This condition is called verticillate.

> Option C:
The internode in Androphore is present between corolla and androecium. This is also known as gynandrophore. The androecium will raise high in the air. The gynoecium will automatically raise itself and go near to the above androecium. For example – Passiflora or Passionflower.

> Option D:
The internode in Gynophore is present between androecium and gynoecium. For example – Cleome.

Hence, the correct answer is option (B).

Additional information:
The arrangement of leaves or phyllotaxy on the stem is classified in 3 types:
- Spiral: In this type, on a node, only one leaf will be borne. The representation of phyllotaxy is like 1/2, 1/3, 2/5, etc. In this whorls are represented by the numerator and the leaves of the whorls are represented by the denominator.
- Opposite: The leaves in this type are present on opposite sides of the nodes.
- Whorled or verticillate: In this type, on a node, two or three types of leaves are present. For example – Nerium.

Note: There are different positions of nodes in the plants. The position of nodes and internodes basically decides the mating of the two parts of the flowers. The leaf arrangement also plays a major role in the position of internodes. The ability and strength of the plants is the main function of leaf arrangement.