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

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

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

Reptiles and birds are:

(1) Oviparous

(2) Viviparous

(3) Ovoviviparous

(4) Viviparous and oviparous respectively

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

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

Assertion(A): Individuals produced by asexual reproduction are genetically similar to parents.
Reason(R): Asexual reproduction involves only mitotic divisions.

1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion

3. If Assertion is a true statement but Reason is false.

4. If both Assertion and Reason are false statements.

Assertion   :       Amoeba shows multiple fission during unfavourable conditions.

Reason      :       Chances of survival are less during unfavourable conditions.

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

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