Question

The Tunica-Corpus theory was proposed by
A. Haberlandt
B. Schmidt
C. Hanstein
D. Nageli

Answer 1

Hint: The Tunica-Corpus theory is related to shoot apex.
It was proposed by a German scientist in the year 1924.

Complete answer: The Tunica-corpus theory describes the planes of cell division in the shoot apex of plants. It was proposed on the basis of observation and studies conducted over plant shoot apex. It is not applicable to roots or any other plant parts.
The theory was proposed by Schmidt in 1924.
He was a German scientist.
The shoot apex can be divided into two tissue zones, viz. tunica and corpus according to this theory.

So, the correct answer is B. Schmidt

Additional information: A concept of the organization and development of the apical meristem, in which the meristematic region is divided into an outer peripheral layer or layers, termed the tunica, and an inner mass of cells called a corpus.
The tunica is characterized by mainly anticlinal divisions and the corpus mainly by periclinal divisions.

Note: Here corpus refers to the central core. Comparatively large cells divide irregularly. Corpus is surrounded by the tunica – it is an outer enveloping layer.
The Tunica layer can be either single or multilayered.