Question

Heterothallism is found in:
a. Mucor
b. Cycas
c. Selaginella
d. Volvox

Answer 1

Heterothallic species have genders that live in various people. The term is applied especially to recognize heterothallic growths, which require two viable accomplices to deliver sexual spores, from homothallic ones, which are fit for sexual multiplication from a solitary living being. In heterothallic growths, two unique organisms contribute cores to shape a zygote.

Complete answer:

In species of Mucor mucedo, the zygospores upon germination delivered germ sporangia which contains spores of just one strain (either + or - ). For this situation, zygospores could be shaped just when mycelia framed from spores of (-) strain shaped in germ sporangia delivered on germination of zygospores are permitted to interact with the mycelia created from the spores of (+) strain. So, Mucor is heterothallism. Thus, option A is correct.

Cycas are seed plants with a long fossil history that was some time ago more plentiful and more varied than they are today. The species are dioecious, along these lines the individual plants of an animal type are either male or female. So option B is incorrect

Selaginella is a little, fragile, low-developing plant. Its enduring sterile stems are short, slim, and sporadically extended coming to up to 15 cm long. They creep along the ground however for the most part turn upwards close to the tip. So, option C is incorrect

Volvox carteri has been widely concentrated as a model of an oogamous and complex organism. So, option D is incorrect.

Hence, the correct answer is option (A).

Note: The term heterothallism was first utilized by Blakeslee in 1904 for the state of sexual propagation which he found in specific types of Mucorales, to such an extent that 'formation is conceivable just through the association of two varying thalli'.Homothallic alludes to the ownership, inside a solitary living being, of the assets to duplicate explicitly; i.e., having male and female contraceptive structures on a similar thallus.