My Notes
The pyrenoids are made up of
(1) Proteinaceous centre and starchy sheath
(2) Core of protein surrounded by fatty sheath
(3) Core of starch surrounded by sheath of protein
(4) Core of nucleic acid surrounded by protein sheath
Match each term with its definition and choose your answer from the codes given:
|
I. |
Isogamy |
1. |
The union of two gametes |
|
II. |
Syngamy |
2. |
Two gametes, one larger than the other |
|
III. |
Heterogamy |
3. |
Two kinds of gametes, one motile and other non motile |
|
IV. |
Anisogamy |
4. |
Two kinds of morphologically distinct gametes |
|
V. |
Oogamy |
5. |
Both gametes morphologically indistinguishable |
Codes:
|
|
I |
II |
III |
IV |
V |
|
1. |
1 |
2 |
3 |
4 |
5 |
|
2. |
4 |
1 |
2 |
3 |
4 |
|
3. |
5 |
1 |
2 |
4 |
3 |
|
4. |
3 |
1 |
2 |
4 |
5 |
Identify the incorrectly matched pair:
| 1. | Chlamydomonas: | Microscopic unicellular algae |
| 2. | Volvox: | Colonial algae |
| 3. | Ulothrix: | Filamentous algae |
| 4. | Fucus: | Isogamous algae |
Identify the incorrect statement regarding algae:
| 1. | At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis. |
| 2. | Around 70 species of freshwater algae can be used as food. |
| 3. | Certain marine brown and red algae produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially. |
| 4. | Agar, obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies. |
Sexual reproduction by non-flagellated but similar in size gametes is seen in:
1. Chlamydomonas
2. Volvox
3. Spirogyra
4. Fucus
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