Question

Arrange the following in correct sequence with reference to sexual reproduction in Rhizopus
I. Formation of germ tube.
II. Formation of zygophores.
III. Formation of warty wall layer of zygospore.
IV. Secretion of trisporic acid.
The correct sequence is

• A. IV, III, II, I
• B. IV, II, III, I
• C. II, I, IV, III
• D. I, III, II, IV

Answer 1

The correct option is B IV, II, III, I

According to sexual reproduction in Rhizopus:
First trisporic acid is secreted and then zygophores are released. It then leads to formation of germ tube. In sexual reproduction special hyphae of opposite mating types touch, their ends swell, and the two cytoplasms intermingle. Nuclei from both parents enter this joint, bulge and a thick walled zygospore develops. Nuclei fuse (diploid), meiosis occurs and haploid spores are formed and dispersed.

Thus, the correct answer is option B.