Which of the following statements regarding gymnosperms are correct?
I. Ovules are naked - not enclosed by any ovary wall before fertilisation but seeds that develop after fertilisation are covered.
II. In all living Gymnosperms, sporophyte is dominant over the gametophyte.
III. They are heterosporous.
IV. The male and female gametophytes do not have an independent existence.
1. I, II and III
2. I, III and IV
3. II, III and IV
4. I, II, III and IV
All the following differentiate gymnosperms from the higher cryptogams except:
(1) Presence of an independent green gametophyte
(2) development of an ovule
(3) Formation of the pollen tube
(4) Presence of cambium
The features seen in the gymnosperm Cycas include:
I. Coralloid roots
II. Unbranched stems
III. Pinnate persistent leaves for a few years
IV. Male cones and megasporophyllys borne on same plant
1. I and II only
2. I and IV only
3. I, II and III only
4. I, II, III, and IV
The first group of terrestrial plants to get rid of the swimming sperm was the:
(1) Club mosses
(2) Ferns
(3) Gymnosperms
(4) Angiosperms
Select the correct statement.
(1) Salvinia, Ginkgo and Pinus all are gymnosperms
(2) Sequoia is one of the tallest trees
(3) The leaves of gymnosperms are not well adapted to extremes of climate
(4) Gymnosperms are both homosporous and heterosporous
Besides paddy fields, cyanobacteria are also found inside vegetative part of
(1) Pinus
(2) Cycas
(3) Equisetum
(4) Psilotum
Gymnosperms are also called soft wood spermatophytes because they lack
(1) cambium
(2) phloem fibres
(3) thick-walled tracheids
(4) xylem fibres
The gametophyte is not an independent, free living generation in
(1) Adiantum
(2) Marchantia
(3) Pinus
(4) Polytrichum
In which one of the following, the male and female gametophytes don't have free-living independent existence?
(1) Pteris
(2) Funaria
(3) Polytrichum
(4) Cedrus
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms
(1) absence of resin duct and leaf venation
(2) presence of vessel elements and absence of archegonia
(3) perianth and two integuments
(4) embryo development and apical meristem