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
Consider the following statements:
Gymnosperms-
I. Are plants in which the ovules remain exposed, both before and after fertilization.
II. Have male and female gametophytes that have independent free-living existence.
III. Are heterosporous.
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Read the following five statements (I to V) and select the option with all correct statements.
I: | Mosses and lichens are the first organisms to colonise bare rock. |
II: | Selaginella is a homosporous pteridophyte. |
III: | Coralloid roots in Cycas have VAM. |
IV: | Main plant body in bryophytes is gametophytic, whereas in pteridophytes it is sporophytic. |
V: | In gymnosperms, male and female gametophytes are present within sporangia located on sporophytes. |
1. | I, III and IV | 2. | II, III and IV |
3. | I, IV and V | 4. | II, III and V |
Read the following statements (A-E) and answer the question which follows them.
A: | In liverworts, mosses, and ferns gametophytes are free-living |
B: | Gymnosperms and some ferns are heterosporous |
C: | Sexual reproduction in Fucus, Volvox and Albugo is oogamous |
D: | The sporophyte in liverworts is more elaborate than that in mosses |
E: | Both, Pinus and Marchantia are dioecious |
How many of the above statements are correct?
1. Two
2. Three
3. Four
4. One
List-I | List-II | ||
(a) | Spirogyra | (i) | Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte |
(b) | Fern | (ii) | Dominant haploid free-living gametophyte |
(c) | Funaria | (iii) | Dominant diploid sporophyte alternating with reduced gametophyte called prothallus |
(d) | Cycas | (iv) | Dominant haploid leafy gametophyte alternating with partially dependent multicellular sporophyte |
(a) | (b) | (c) | (d) | |
1. | (ii) | (iv) | (i) | (iii) |
2. | (iv) | (i) | (ii) | (iii) |
3. | (ii) | (iii) | (iv) | (i) |
4. | (iii) | (iv) | (i) | (ii) |
List-I | List-II | ||
(a) | Chlamydomonas | (i) | Moss |
(b) | Cycas | (ii) | Pteridophyte |
(c) | Selaginella | (iii) | Alga |
(d) | Sphagnum | (iv) | Gymnosperm |
(a) | (b) | (c) | (d) | |
1. | (iii) | (i) | (ii) | (iv) |
2. | (iii) | (iv) | (ii) | (i) |
3. | (iii) | (ii) | (i) | (iv) |
4. | (ii) | (iii) | (i) | (iv) |
Assertion (A): | In gymnosperms, the pollen grains are released from the microsporangium and carried by air currents. |
Reason (R): | Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed. |
1. | (A) is False, (R) is True. |
2. | Both (A) and (R) are True and (R) correctly explains (A). |
3. | Both (A) and (R) are True and (R) does not correctly explain (A). |
4. | (A) is True, (R) is False. |