Sexual reproduction by non-flagellated but similar in size gametes is seen in:
1. Chlamydomonas
2. Volvox
3. Spirogyra
4. Fucus
In mosses, the sex organs are seen in:
1. Protonema stage
2. Leafy stage
3. Capsule of the sporophyte
4. Seta of the sporophyte
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 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
An example of colonial alga is
1. Chlorella
2. Volvox
3. Ulothrix
4. Spirogyra
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