Q. No.The endosperm of a gymnosperm develops _______ fertilization, whereas the endosperm of an angiosperm develops _________ fertilization.
(1) before, before
(2) after, after
(3) after, before
(4) before, after
In Pinus,
I. The stem is branched
II. Roots have fungal association in the form of mycorrhiza
III. The male and female strobili are borne on different trees
Of the above statements:
(1) Only I is correct
(2) Only II is correct
(3) Only I and II are correct
(4) I, II and III are correct
Identify the incorrect statement:
1. The earliest systems of classification used only gross superficial morphological characters.
2. Linnaeus classification of plants was a natural classification as it was based on the androecium structure.
3. Artificial systems gave equal weightage to vegetative and sexual characteristics.
4. Natural classification systems are based on natural affinities among the organisms
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. |
What is not true for red algae?
1. Lack centriole and flagella
2. Accessory pigments include phycocyanin, phycoeythrin and allophycocyanin
3. They reproduce using alternation of generation
4. The stored food is floridean starch very similar to cellulose
Identify the incorrect statement regarding green algae?
1. They contain chl a, chl b as well as carotenoids.
2. The chloroplasts may be discoid, plate-like, reticulate, cup-shaped, spiral or ribbon-shaped in different species.
3. Most members have one or more storage bodies called pyrenoids located outside the chloroplasts.
4. They usually have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.
Consider the following statements regarding brown algae:
| I. | The pigments are chl a, c and xanthophylls, fucoxanthin |
| II. | Storage food is laminarin and mannitol |
| III. | The cellulosic cell wall is covered with algin |
| IV. | They have a centrally located vacuole |
| V. | Their photosynthetic organs are called as fronds - leaf like structures |
| VI. | They have pear shaped biflagellate zoospores |
| VII. | They have two unequal laterally attached flagella. |
The number of correct statements is
1. 5
2. 6
3. 7
4. 4
Consider the following adaptations seen in plants:
I. Lack of cuticle
II. Presence of stomata for exchange of gases
III. Evolution of leaf
IV. Dominance of sporophyte
V. Structural support of vascular tissue
Which of the above adaptations would be required in a plant if it has to be successfully adapted to life on land?
1. All but I
2. All but I and III
3. I, II, III and IV
4. All
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