Q. No.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
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
Consider the following statements:
| I: | Pteridophytes are the first terrestrial plants to possess vascular bundles. |
| II: | Main plant body in pteridophytes is sporophyte which is differentiated into true stem and leaves. |
| III: | Genera like Selaginella and Salvinia 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
Consider the following statements:
| I: | The stored food in Rhodophyceae is floridean starch. |
| II: | Cellulose and algin are present in the cell wall of Phaeophyceae. |
| III: | Chlorophyceae members have 2 laterally placed unequal flagella. |
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 a 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 sporophyte. |
1. I, III and IV
2. II, III and IV
3. I, IV and V
4. II, III and V
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
Which one of the following statements is wrong?
(1) Algae increases the level of dissolved oxygen in the immediate environment
(2) Algin is obtained from red algae and carrageen from brown algae
(3) Agar-agar is obtained from Gelidium and Gracilaria
(4) Laminaria and Sargassum are used as food
In bryophytes and pteriodophytes, transport of male gametes requires
1. insects
2. birds
3. water
4. wind
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
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