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. |
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) |
Match List -I with List-II
List - I | List - II | ||
a. | Cedrus | (i) | Pteridophyte |
b. | Adiantum | (ii) | Gymnosperm |
c. | Sphagnum | (iii) | Liverwort |
d. | Marchantia | (iv) | Moss |
Choose the correct answer from the options given below:
a. | b. | c. | d. | |
1. | (ii) | (iii) | (i) | (iv) |
2. | (iii) | (i) | (iv) | (ii) |
3. | (ii) | (i) | (iv) | (iii) |
4. | (iii) | (iv) | (ii) | (i) |
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) |
Which of the following statements is incorrect about gymnosperms?
1. They are heterosporous
2. Male and female gametophytes are free-living
3. Most of them have narrow leaves with thick cuticles
4. Their seeds are not covered
Pinus seeds cannot germinate and establish without fungal association. This is because:
1. its seeds contain inhibitors that prevent germination.
2. its embryo is immature.
3. it has an obligate association with mycorrhizae.
4. it has a very hard seed coat.
Which of the following statement is correct?
1. | Ovules are not enclosed by the ovary wall in gymnosperms. |
2. | Selaginella is heterosporous, while Salvinia is homosporous. |
3. | Horsetails are gymnosperms. |
4. | Stems are usually unbranched in both Cycas and Cedrus. |
Select the mismatch
1. Cycas - Dioecious
2. Salvinia - Heterosporous
3. Equisetum - Homosporous
4. Pinus - Dioecious
Conifers are adapted to tolerate extreme environmental conditions because of?
1. broad hardy leaves
2. superficial stomata
3. thick cuticle
4. the presence of vessels
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 |