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  • 1(current)
Q. No.

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
Subtopic:  Sexual Reproduction |
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Regarding differences between menstrual cycle and oestrous cycle:
 
Statement I: Animals that have oestrous cycles resorb the endometrium if conception does not occur during that cycle and animals that have menstrual cycles shed the endometrium through menstruation instead.
Statement II:  In species with oestrous cycles, females are generally only sexually active during the oestrus phase of their cycle and females of species with menstrual cycles can be sexually active at any time in their cycle, even when they are not about to ovulate.
 
1. Statement I is correct, Statement II is incorrect.
2. Statement I is correct, Statement II is correct.
3. Statement I is incorrect, Statement II is correct.
4. Statement I is incorrect, Statement II is incorrect.
Subtopic:  Sexual Reproduction |
 70%

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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
Subtopic:  Sexual Reproduction |
 71%
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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
Subtopic:  Sexual Reproduction |
 62%
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Which one of the following plants is monoecious?

1. Marchantia 2. Pinus
3. Cycas 4. Papaya

Subtopic:  Sexual Reproduction |
 72%

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In the given figure:
1. A is the female thallus of Marchantia and B is the male thallus of Marchantia
2. A is the male thallus of Marchantia and B is the female thallus of Marchantia
3. A is the female thallus of Chara and B is the male thallus of Chara
4. A is the male thallus of Chara and B is the female thallus of Chara
Subtopic:  Sexual Reproduction | Events during Sexual reproduction |
 88%
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The number of chromosomes in a gamete of Ophioglossum is:

1. 1260 2. 380
3. 630 4. 78
Subtopic:  Sexual Reproduction |
 62%
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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
Subtopic:  Sexual Reproduction |
 85%
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The chances of survival of young ones are greater in viviparous organisms.
Reason (R): In such animals, fertilised eggs covered by a hard calcareous shell are laid in a safe place in the environment.
In the light of the above statements, choose the most appropriate answer from the options given below :
1. (A) is true but (R) is false.
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. Both (A) and (R) are true and (R) is the correct explanation of (A).
4. (A) is false but (R) is true.
Subtopic:  Sexual Reproduction | Events during Sexual reproduction |
 73%
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