Question

What is longitudinal groove run lengthwise separating theca?

Answer 1

Thecae are locules of anther, each containing two microsporangia. Anther is dithecous and the two thecae are separated by a column of sterile tissues (connective tissues), running lengthwise which is externally visible as deep longitudinal groove (narrow cut or depression). These types of partition also exist between sporangia in a theca.

Answer 2

Answer:

Explanation:

Each lobe has two theca, i.e. each lobe is dithecous. A longitudinal groove runs lengthwise to separate the theca.