Anthophore is an internode between
A. Two opposite leaves in spiral phyllotaxy
B.Calyx and Corolla
C. Corolla and androecium
D. Androecium and gynoecium

Hint: Anthophore is a form of floral stripe which is produced by the elongation of internode in a flower. In other words, it is a stalk-like extension on which pistils are borne.

Complete answer:
The thalamus is the thick part of the stem where different flowers are grown. It is long and internodes are present in it. Let us analyze the options given.
 Option A: Two opposite leaves in spiral phyllotaxy: phyllotaxy is the arrangement of leaves. In spiral phyllotaxy, the leaves are spread evenly on all the stems. It has no function in the thalamus of a flower. Therefore, this is the incorrect option.

Option B: all the sepals of the flower together are called calyx and all the petals of a flower are corolla. Together they form a perianth. Anthophore internode is present between calyx and corolla. It is also called anthophorum. Therefore, this is the correct option.

Option C: Androecium is the male reproductive part of a flower. Also called stamens. The internodes between corolla and androecium are called andropore. Therefore, this is the incorrect option.

Option D: Unlike androecium, gynoecium is the female reproductive part of a flower. Also called pistils. It produces ovules. Therefore, this is the incorrect option.

Hence, the correct answer is option (B)

Note: Thalamus is basically present near the stalk of the flower and it consists of distinct internodes and nodes. It is also known as a modified stem. Calyx is also known as sepals and its major function is to protect flower buds. Corolla is also known as the petals and they are generally bright in colour in order to attract pollinators.