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Q. No.Assertion(A): Double fertilization is an event unique to angiosperms.
Reason(R): There is an occurrence of two fusions i.e., syngamy and triple fusion.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Level 3: 35%-60%
Hints
| Assertion(A): | Earliest systems of classification separated the closely related species. |
| Reason(R): | Such systems were based on phylogenetic characters. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: Classification System |
78%
Level 2: 60%+
Hints
| Assertion(A): | Mosses reduce the impact of falling rain and prevent soil erosion. |
| Reason(R): | Lichens form a dense mat on the soil. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: Bryophytes |
57%
Level 3: 35%-60%
Hints
| Assertion(A): | Gymnosperms are called naked-seeded plants. |
| Reason(R): | The seeds remain exposed after their fertilization. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: Gymnosperms |
Level 4: Below 35%
Hints
Thallus level of organisation, rhizoids, dominant gametophyte and dependence on water to complete its life are the characteristics seen in:
| 1. | Pteridophytes | 2. | Gymnosperms |
| 3. | Angiosperms | 4. | Bryophytes |
Subtopic: Bryophytes |
89%
Level 1: 80%+
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What is the correct description of a prothallus?
| 1. | A structure in gymnosperms formed just after fertilisation |
| 2. | A sporophytic free living structure formed in pteridophytes |
| 3. | A gametophytic free living structure formed in pteridophytes |
| 4. | Sex organs bearing stage in Bryophytes |
Subtopic: Pteridophytes |
78%
Level 2: 60%+
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A ‘protonema’ stage in the life cycle of a moss is the:
| 1. | first stage in gametophyte generation |
| 2. | second stage in gametophyte generation |
| 3. | first stage in sporophyte generation |
| 4. | second stage in sporophyte generation |
Subtopic: Bryophytes |
69%
Level 2: 60%+
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Besides starch, pyrenoids in many members of Chlorophyceae, contain:
| 1. | Double-stranded DNA |
| 2. | A low molecular weight RNA |
| 3. | Protein |
| 4. | Lipids |
Subtopic: Chlorophyceae: Green Algae |
87%
Level 1: 80%+
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In Cycas:
| I: | coralloid roots are associated with N2-fixing cyanobacteria |
| II: | the stems are unbranched |
| III: | the pinnate leaves persist for a few years |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Gymnosperms |
80%
Level 1: 80%+
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I [Algal class] |
Column II [Feature of flagella] |
||
| A | Chlorophyceae | P | 2, unequal, lateral |
| B | Phaeophyceae | Q | Absent |
| C | Rhodophyceae | R | 2-8, equal, apical |
| A | B | C | |
| 1. | R | P | Q |
| 2. | R | Q | P |
| 3. | P | R | Q |
| 4. | Q | R | P |
Subtopic: Pheophyceae: Brown Algae | Rhodophyceae: Red Algae and Importance of Algae | Chlorophyceae: Green Algae |
88%
Level 1: 80%+
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