Question

In ovule, endothelium is

• A. Nucellus
• B. Nucellus surrounding embryo sac
• C. Tissue near chalaza
• D. Inner part of integument

Answer 1

Answer: (D)

Inner part of integument

In some plants having unitegmic and tenuinucellate ovules, the nucellus degenerates at an early stage. In such ovules, the innermost layer of the integument becomes specialized to perform the nutritive function of the growing embryo sac. This specialized tissue is called the Endothelium. The endothelium is generally single layered and the cells are radially elongated and have dense cytoplasm. Hence, in the ovule Endothelium is the inner part of the integument.

So, the correct answer is D.