Question 1

Gemmae are multicellular green structures for vegetative propagation. These are found inside gemma cups in _________________.

Accepted Answer

In Marchantia, the plant body consists of a dorsoventrally flattened, prostrate and dichotomously branched thallus. The thalli are conspicuous, the apex of each thallus is notched. Along the mid-rib are present characteristic, prominent goblet or cup-shaped structures, the gemma cups, with smooth, dentate or frilled margins. These cups enclose asexual reproductive bodies called gemma.So the correct option is B.

Question 2

Which among the following statement(s) is correct for haplodiplontic life cycle of plants?

Accepted Answer

Haplodiplontic life cycle is exhibited majorly by plants of Bryophyta and Pteridophyta but some algae like Ectocarpus, Polysiphoina and Kelp also show this type of life cycle. In haplodiplontic life cycle, the dominant phase may vary viz. a dominant haploid gametophyte will have short-lived multicellular sporophyte while a dominant diploid sporophyte will have short-lived gametophyte.Hence, options 'A', 'C' and 'D' are correct.

Question 3

Select the incorrect statement regarding reproduction in Rhodophyceae.

Accepted Answer

Rhodophyceae are red algae found majorly in the marine environment with a small percentage of freshwater species. Asexual reproduction occurs through non-motile spores like monospore, tetraspore, etc.Sexual reproduction is an advanced oogamous type where the male gamete, the spermatium is non-motile. It reaches the female reproductive structure the carpogonium and reaches the egg or the oogonium through a structure called the trichogyne. Fertilization is facilitated by water currents as none of the gametes are motile. The post-fertilization changes in Rhodophyceae are complex giving rise to triphasic life cycles.So, the correct answer is option B.

Plant Kingdom