Many mammals, especially in natural, wild conditions are:

(1) Continuous breeders

(2) Seasonal breeders

(3) Both continuous and seasonal breeders

(4) Very much disease sensitive

Subtopic:  Events during Sexual reproduction |
 64%
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Which of the following regulates the reproductive processes and the associated behavioural expressions of organisms?

(1) Hormones

(2) Environmental factors

(3) Abiotic components

(4) Interaction between hormones and environmental factors

Subtopic:  Events during Sexual reproduction |
 79%
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Meiosis:

(1) Does not take place in organisms showing asexual reproduction only

(2) Takes place in some sexually reproducing haploid organism

(3) Takes place in sexually reproducing diploid organism

(4) All of the above are correct

Subtopic:  Events during Sexual reproduction |
 60%
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Reptiles and birds are:

(1) Oviparous

(2) Viviparous

(3) Ovoviviparous

(4) Viviparous and oviparous respectively

Subtopic:  Events during Sexual reproduction |
 85%
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Find out the incorrect statement(s):

(1) The chances of survival of young ones are greater in viviparous animals than in oviparous animals

(2) In Datura, tomato, etc. sepals remain attached even after fertilization

(3) Asexual reproduction is better than sexual reproduction

(4) All of these

Subtopic:  Asexual Reproduction |
 68%
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Ploidy of ovary, anther, egg, pollen, male gamete and zygote are respectively:

(1) 2n, 2n, n, 2n, n, 2n

(2) 2n, 2n, n, n, n, 2n

(3) 2n, n, n, n, n, n

(4) 2n, 2n, n, 2n, 2n, 2n

Subtopic:  Events during Sexual reproduction |
 70%
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Monoecious plant of Chara shows occurrence of:

(1) Stamen and carpel on the same plant

(2) Upper antheridium and lower oogonium on the same plant

(3) Upper oogonium and lower antheridium on the same plant

(4) Antheridiophore and archegoniophore on the same plant

Subtopic:  Sexual Reproduction |
 80%
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I. Bamboo species flower only once in their life time, generally after 50 -100 years, produce large number of fruits and die

II. In animals the juvenile phase is followed by physiological changes prior to active reproductive behaviour.

III. The reproductive phase is of same duration in all organisms.

IV. Juvenile phase is the period of growth between the birth of an individual till it reaches reproductive maturity.

V. In plants juvenile phase is also called vegetative phase.

Which of the following statements is false?

(1) I

(2) II

(3) III

(4) V

Subtopic:  Sexual Reproduction |
 87%
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Select the correct sequence from the following:

I. Juvenile phase → Senescent phase → Reproductive phase

II. Juvenile phase → Reproductive phase → Senescent phase

III. Reproductive phase → Juvenile phase → Senescent phase

IV. Vegetative phase → Reproductive phase → Senescent phase

(1) I and II

(2) I and IV

(3) III and IV

(4) II and IV

Subtopic:  Sexual Reproduction | Events during Sexual reproduction |
 79%
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Select the-correct sequence from the following:

(1) Gametogenesis → Syngamy → Zygote → Embryogenesis

(2) Gametogenesis → Syngamy → Embryogenesis → Zygote

(3) Zygote → Embryogenesis → Gametogenesis

(4) Syngamy → Gametogenesis → Zygote → Embryogenesis

Subtopic:  Events during Sexual reproduction |
 86%
From NCERT
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