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