The sobriquet ‘terror of Bengal’ has been given to:

1. Pistia 2. Lemna
3. Eichhornia 4. Zostera

Subtopic:  Asexual Reproduction |
 92%
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Consider the two statements:

I: Organisms like algae and fungi shift to a sexual mode of reproduction just before the onset of adverse conditions.
II: In sexual reproduction large number of progeny can be produced in a short span of time.
 
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.
Subtopic:  Asexual Reproduction |
 68%
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Which of the following is not always true for sexual mode of reproduction?
I. Separate sexes in the species
II. Gamete formation
III. Fertilization

1. Only I 2. Only III
3. Both I and III 4. Both II and III
Subtopic:  Sexual Reproduction |
 78%
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The end of the juvenile/vegetative phase which marks the beginning of the reproductive phase can be seen easily in the higher plants when they:
1. come to the flower
2. start producing seeds
3. start producing lateral branches
4. undergo secondary growth

Subtopic:  Sexual Reproduction |
 80%
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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 |
 70%
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Birds in captivity (as in poultry farms) :

1. lay eggs seasonally
2. can be made to lay eggs throughout the year
3. exhibit estrous cycles
4. exhibit menstrual cycles
Subtopic:  Sexual Reproduction |
 87%
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Menstrual cycles occur in:
1. all animal females
2. all female mammals
3. female monkeys, apes, and humans
4. only in human females

Subtopic:  Sexual Reproduction |
 89%
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Which of the following is the most critical event of sexual reproduction?

1. Gametogenesis 2. Gamete Transfer
3. Fertilization 4. Embryogenesis
Subtopic:  Events during Sexual reproduction |
 78%
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A plant with both male flowers and female flowers is called as:

1. Unisexual 2. Bisexual
3. Dioecious 4. Monoecious
Subtopic:  Sexual Reproduction |
 54%
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A flower that produces only pollens is called as:

1. Perfect flower 2. Staminode
3. Dioecious 4. Staminate

Subtopic:  Sexual Reproduction |
 69%
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