9
MCQ (Single Correct Answer)
Protonema is
A
haploid and is found in mosses
B
diploid and is found in liverworts
C
diploid and is found in pteridophytes
D
haploid and is found in pteridophytes
10
MCQ (Single Correct Answer)
The giant redwood tree (Sequoia sempervirens) is a/an
A
angiosperm
B
free fern
C
pteridophyte
D
gymnosperm
11
Food is stored as floridean starch in Rhodophyceae. Mannitol is the reserve food material of which group of algae?
Explanation
The members of Phaeophyceae (brown algae) store mannitol as a reserve food material.
12
Give an example of plants with
(a) haplontic life cycle
(b) diplontic life cycle
(c) haplo diplontic life cycle
Explanation
(a) Haplontic life cycle It is exhibited by Volvox, Spirogyra and Chlamydomonas. The dominant photosynthetic phase in these plants is gamotophytic phase which develops from a haploid spores after a mitotic cell division of zygote.
(b) Diplontic life cycle is found in gymnosperms and angiosperms. The dominant phase is diploid sporophyte plant develop from zygote.
(c) Haplodiplontic life cycle It is an intermediate conditions exhibited by bryophytes and pteridophytes. Here haploid gametophytic stage alternates with diploid sporophytic stage.
13
The plant body in higher plants is well differentiated and well developed. Roots are the organs used for the purpose of absorption. What is the equivalent of roots in the less developed lower plants?
Explanation
Roots are represented by root like structure called rhizoids in less developed lower plants (bryophytes and pteridophytes). The plant tissue system in these is not differentiated into true leaf, stem and roots as it is found in higher plants (gymnosperm and angiosperm).