What is true about the given figure?
1. | The plant concerned is Chara, A is Oogonium and B is Antheridium |
2. | The plant concerned is Chara, B is Oogonium and A is Antheridium |
3. | The plant concerned is Marchantia, A is Oogonium and B is Antheridium |
4. | The plant concerned is Marchantia, B is Oogonium and A is Antheridium |
The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because:
1. | Offspring do not possess exact copies of parental DNA |
2. | DNA of only one parent is copied and passed on to the offspring |
3. | Offspring are formed at different times |
4. | DNA of the parent and offspring are completely different. |
The male gametes of a rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote, and the cells of the seedling will be, respectively:
1. | 12, 24, 12 | 2. | 24, 12, 12 |
3. | 12, 24, 24 | 4. | 24, 12, 24 |
Given below are a few statements related to external fertilization. Choose the correct statements.
i. | The male and female gametes are formed and released simultaneously. |
ii. | Only a few gametes are released into the medium. |
iii. | Water is the medium in a majority of organisms exhibiting external fertilization. |
iv. | Offspring formed as a result of external fertilization have a better chance of survival than those formed inside an organism. |
1. | iii and iv | 2. | i and iii |
3. | ii and iv | 4. | i and iv |
There is no natural death in single-celled organisms like Amoeba and bacteria because:
1. They cannot reproduce sexually
2. They reproduce by binary fission
3. Parental body is distributed among the offspring
4. They are microscopic
Consider the two statements:
I: | Lifespan of living organisms are correlated with their body size |
II: | Almost always, larger the body size more will be the lifespan |
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 and II is incorrect.
4. Both I and II are incorrect.
Match the asexual reproductive structure in COLUMN I with organisms in COLUMN II and select the correct option from the codes given:
|
COLUMN I |
|
COLUMN II |
A. |
Zoospore |
a. |
Penicillium |
B. |
Conidia |
b. |
Chlamydomonas |
C. |
Buds |
c. |
Sponge |
D. |
Gemmule |
d. |
Hydra |
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 |
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 |
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 |
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 |