Consider the two statements:
I: | Eichhornia crassipes, the ‘terror of Bengal’ is an invasive weed. |
II: | It was introduced in India for its beautiful flower and shape of leaves. |
1. | Both I and II are correct and II explains I. |
2. | Both I and II are correct but II does not explain I. |
3. | I is correct but II is incorrect. |
4. | I is incorrect but II is correct. |
With the advent of adverse conditions, an organism capable of reproducing both asexually and sexually, will most likely:
1. | shift to asexual mode of reproduction |
2. | shift to sexual mode of reproduction |
3. | equally reproduce by both modes |
4. | die |
In the given diagrams each part A, B, C and D shows a reproductive structure in an organism marked as ‘X’. Select the option where all parts are correctly matched:
A. |
B. | ||
B. |
D. |
1. | A: Oogonium of Chara; B: Archegoniophore of Marchantia; C: Conidia of Penicillium; D: Offset of Eicchornia |
2. | A: Antheridium of Chara; B: Antheridiophore of Marchantia; C: Sporangiophores of Penicillium; D: Offset of Eicchornia |
3. | A: Oogonium of Chara; B: Antheridiophore of Marchantia; C: Conidia of Penicillium; D: Offset of Eicchornia |
4. | A: Antheridium of Chara; B: Archegoniophore of Marchantia; C: Conidia of Penicillium; D: Stolon of Eicchornia |
The ability to produce adventitious buds is exploited by gardeners for commercial propagation of:
1. | Bryophyllum | 2. | Agave |
3. | Water hyacinth | 4. | Ginger |
Encystation during unfavorable conditions followed by multiple fission and sporulation when favorable conditions return is seen in:
1. | Sponges | 2. | Penicillium |
3. | Amoeba | 4. | Hydra |
The number of chromosomes in a gamete of Ophioglossum is:
1. | 1260 | 2. | 380 |
3. | 630 | 4. | 78 |
Corresponding to ‘monoecious’ in a plant, the bisexual condition in a fungus would be best described as:
1. | Homothallic | 2. | Heterothallic |
3. | Hermaphrodite | 4. | Complete ad perfect |
In several simple plants like algae, bryophytes, and pteridophytes, water is the medium through which gamete transfer takes place. To increase the chances of fertilization, such plants:
1. | Produce a large number of female gametes that are non-motile |
2. | Produce a large number of male gametes that is several thousand times the number of female gametes produced |
3. | Produce a large number of female gametes that is several thousand times the number of male gametes produced |
4. | Do not have the capability of reproducing asexually |
Identify the correct statements:
I. | Clear-cut vegetative, juvenile, and senescent phases are seen only in perennial plants. |
II. | Neelakurinji flowers once in 12 years. |
III. | Bamboo flowers only once in their lifetime. |
1. | Only III |
2. | Only II and III |
3. | Only I and II |
4. | I, II, and III |
Match vegetative propagules in COLUMN I with plants in COLUMN II and select the correct option from the codes given:
|
COLUMN I |
|
COLUMN II |
A. |
Rhizome |
a. |
Bryophyllum |
B. |
Bulbil |
b. |
Eichhornia |
C. |
Leaf buds |
c. |
Ginger |
D. |
Offset |
d. |
Agave |
Options: | (A) | (B) | (C) | (D) |
1. | a | b | c | d |
2. | d | c | b | a |
3. | c | d | a | b |
4. | b | a | d | c |