plant kingdom
assertion and reason
In the following questions, a statement of assertion (A) is followed by a statement of reason (R).
(1) If both Assertion & Reason are true and the Reason is the correct explanation of Assertion then mark (1)
(2) If both Assertion & Reason are true but the Reason is not correct explanation of the Assertion then mark (2)
(3) If Assertion is true statement but Reason is false, then mark (3)
(4) If both Assertion and Reason are false statements, then mark (4)
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- A-The spread of living pteridophytes is limited and restricted to narrow geographical regions.
R- Multicellular, free-living mostly photosynthetic thalloid gametophyte of pteridophyte is called prothallus.
2. A- During the life cycle of sexually reproduceing plant, there is an alternation of generation.
R- Alteration of generation occurs between diploid gametophyte and haploid sporophyte.
3. A- Porphyra is a member of Rhodophyceae and called red alga.
R-Predominant pigment in Porphyra is a red pigment, r-phycoerythrin.
4. A- Main plant body of bryophyte is called gametophyte.
R-Bryophyte possess root like, leaf like and stem like structures.
5. A- Water is required for transfer of male gametes to archegonium in ferns
R- Ferns bear sporongia on gametophytes which in turn bear diploid sex organs.
6. A- Bryophytes are called amphibians of plant kingdom.
R- Bryophytes can live in soil but are dependent on water for sexual reproduction.
7. A- In pteridophytes, both the gametophytic and sporophytic phases are multicellular and vascular.
R- Pterdophytes exhibit diplontic life cycle pattern.
8. A- Sexual reproduction may be isogamous, anisogamous or oogamous in brown algae.
R- In brown algae, sexual reproduction is accompanied by complex post fertilization developments.
9.. A- The female sex organ in a flower is the pistil or the carpel.
R- Female gametophyte is also known as embryo sac in flowering plants.
10. A- In pteridophytes, the root, stem and leaves possess well- developed vascular tissues.
R- In pteridophytes, the main plant body is a sporophyte.
11. A- Vascular plants are well adapted to the environment and dominate the land.
R- Vascular plants have xylem and phloem for long distance transport.
12. A- Gymnosperms do not produce fruit.
R- Ovules of gymnosperms are enclosed within the ovaries.
13. A- In gymnosperms, the male and female gametophytes do not have an independent free- living existence.
R- Gametophytes of gymnosperms remain within the sporangia retained on the sporophytes.
14. A- The leaves in gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind.
R- Unlike bryophytes and pteridophytes, in gymnosperms the male and female gametophytes do not have an independent free-living existence.
15. A- True stem and leaves are absent in bryophytes.
R- In bryophytes, sporophytes is parasitic over gametophytes.
ANSWER
- (2) 2. (3) 3. (1) 4. (2) 5. (3)
6. (1) 7. (4) 8. (3) 9. (2) 10. (2)
11. (1) 12. (3) 13. (1) 14. (2) 15. (2)
QUOTE:- “ANGER IS A SIGN OF WEAKNESS, IT MUST BE CONTROLLED TO GAIN CONTROL OUR LIFE”
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