Pick the correct group consisting of all genera exhibiting homospory.
(1) Lycopodium, Psilotum, Selaginella, Equisetum
(2) Equisetum, Pteris, Salvinia, Psilotum
(3) Salvinia, Pteris, Lycopodium, Selaginella
(4) Equisetum, Psilotum, Lycopodium, Pteris
The spreading of living pteridophyte is limited and is restricted to narrow geographical region because of
1. Growth requirements of gametophyte (cool, damp and shady places).
2. Requirement of water for fertilisation.
3. Absence of stomata in leaf and absence of vascular tissue.
4. Both 1. and 2..
The given diagram shows:
(1) An alga that lacks flagellated cells
(2) A liverwort
(3) A heterosporous pteridophyte
(4) A gymnosperm with non motile sperms
A Prothallus is
1. A structure in pteridophytes formed before the thallus develops
2. A sporophytic free living structure formed in pteridophytes
3. A gametophyte free living structure formed in pteridophytes
4. A primitive structure formed after fertilization in pteridophytes
From an evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in:
1. | Gymnosperms | 2. | Liverworts |
3. | Mosses | 4. | Pteridophytes |
A feature common in gametophyte of both mosses and maximum ferns is-
1. Independent existence
2. Both are monoecious in nature
3. Presence of vascular tissue
4. Both are filamentous
Development of the zygotes into young embryo takes within the female gametophytes in
1. Adiantum.
2. Selaginella.
3. Riccia.
4. Batrachospermum.
In which of the following plants, strobili are not formed?
(1) Equisetum
(2) Cycas
(3) Dryopteris
(4) Pinus
Gametophyte in the pteridophytes is
(i) Small, inconspicuous.
(ii) Long-lived, unicellular.
(iii) Mostly photosynthetic thalloid or saprophytic.
(iv) Short lived, haploid.
How many statements are correct with respect to gametophyte?
1. Two
2. Three
3. Four
4. One
In pteridophytes, antheridium are present in :-
1. Leafy gametophyte
2. Prothallus
3. Sporophyll
4. Protonema