Question

Hammerling’s experiment on Acetabularia involved exchanging
(a) Cytoplasm
(b) Nucleus
(c) Rhizoid and Stalk
(d) Gametes

Answer 1

Hint: The cell of Acetabularia consists of three parts, where the nucleus carries genetic information, and then it transfers it to other parts and helps in cellular development. In this experiment, the stalk is grafted to the foot of different species.

Complete answer:
The Hammerling’s experiment of Acetabularia consists of three parts, the foot or base where the nucleus is present, the cap, and the stalk. Here the stalk of one species is grafted on the foot of the other species of Acetabularia. In Acetabularia, the cap always developed in resemblance and similar to the foot or base of the species. This indicates that the base constitutes the nucleus that in turn holds genetic material and is responsible for cellular development.
-Acetabularia is a single-celled green alga found in the subtropical waters that belong to the genus Polyphysaceae.
-It consists of three parts: Rhizoid with short hairs at the bottom, stalk in the middle, and the cap at the top.
-In the rhizoid, a single nucleus is present that helps in the regeneration of the cap when it is removed.
-The caps of the species can be removed and grafted from different species that will develop according to the base of the species.
-When the nucleus is inserted from one species to another the species of both as both the nucleus produces their characteristics.

So, the correct answer is ‘Rhizoid and Stalk’.

Note:
The Hammerling’s experiment was performed by a Danish-German biologist Dr. Joachim Hammerling who proved that the nucleus consists of genetic material and is responsible for the development of organisms.