- 1(current)
Q. No.Sexual reproduction of Spirogyra is an advanced feature as it shows
| 1. | Different sizes of motile sex organs |
| 2. | Same size of motile sex organs |
| 3. | Morphologically different sex organs |
| 4. | Physiologically different sex organs |
Which one of the following statements is wrong?
| 1. | Laminaria and Sargassum are used as food. |
| 2. | Algae increase the level of dissolved oxygen in the immediate environment. |
| 3. | Algin is obtained from red algae, and carrageenan from brown algae. |
| 4. | Agar-agar is obtained from Gelidium and Gracilaria. |
Which of the following pairs is of unicellular algae?
| 1. | Gelidium and Gracilaria |
| 2. | Anabaena and Volvox |
| 3. | Chlorella and Spirulina |
| 4. | Laminaria and Sargassum |
If you are asked to classify the various algae into distinct groups, which of the following characters you should choose ?
1. Types of pigments present in the cell
2. Nature of stored food materials in the cell
3. Structural organisation of thallus
4. Chemical compositions of the cell wall
A student observed algae with chlorophyll 'a', 'd', and phycoerythrin. It should belong to:
| 1. | Phaeophyta | 2. | Rhodophyta |
| 3. | Chlorophyta | 4. | Bacillariophyta |
Select the wrong statement :
| 1. | Anisogametes differ either in structure, function or behaviour |
| 2. | In Oomycetes, female gamete is smaller and motile, while male gamete is larger and non-motile |
| 3. | Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy |
| 4. | Isogametes are similar in structure, function and behaviour |
In oogamy, fertilization involves:
| 1. | A large non-motile female gamete and a small motile male gamete |
| 2. | A large non-motile female gamete and a small non-motile male gamete |
| 3. | A large motile female gamete and a small non-motile male gamete |
| 4. | A small non-motile female gamete and a large motile male gamete |
Given are the following five statements (I - V) for your consideration:
| I: | In Equisetum, the female gametophyte is retained on the parent sporophyte |
| II: | In Ginkgo, male gametophyte is not independent |
| III: | The sporophyte in Marchantia is more developed than that in Polytrichum |
| IV: | Sexual reproduction in Volvox is isogamous |
| V: | The spores of slime moulds lack cell walls |
How many of the above statements is/are correct?
| 1. | Three | 2. | Four |
| 3. | One | 4. | Two |
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.