Home
Class 12
BIOLOGY
Read the following statements about the ...

Read the following statements about the reproductive cycles in mammals and select the correct ones.
(i) Oestrous cycle occurs in primate mammals.
(ii) In species with oestrous cycle, females are generally sexually active during oestrous phase.
(iii)Both the cycles show monthly recurrence.

A

(i) and (ii)

B

(ii) and (iii)

C

(ii) only

D

(i), (ii) and (iii)

Text Solution

Verified by Experts

The correct Answer is:
c
Oestrous cycle occur in non-primates such as cows, dogs, etc. Mentstrual cycle occurs in primates only. Menstrual cycle shows monthly recurrence but oestrous cylce does not.
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the following statements about asexual reproduction and select the correct ones. (i) It involves a single parent. (ii) It is slower than sexual reproduction. (iii) It produces progeny that are genetically identical with the parent but not with one another. (iv) The progeny of asexual reproduction can be termed as clones.

Read the following statements about cell division and select the correct ones. (i) M phase represents the phase when actual cell division occurs and I phase represents the phase between two successive M phases. (ii) In the 24 hours average duration of cell cycle of a human cell, cell division proper lasts for only about an hour. (iii) M phase constitutes more than 95% of the duration of cell cycle.

Read the following statements about menstrual cycle and select two correct statements: (i). Lack of menstruation may be indicative of pregnance (ii). The changes in the ovary and the uterus are induced by changes in the lveles of ovarian hormones only (iii). LH surge induces ovulation (iv). If fertilisation occurs, corpus luteum degenerates immediately

Read the following statements about 'Terror of Bengal' and select the correct ones. (i) 'Terror of Bengal' is the name given to water hyacinth (Eichhornia), an algae. (ii) Eichhornia was introduced in India due to its aesthetic value. (iii) Eichhornia drains oxygen from the water which leads to death of fishes.

Study the following statements regarding food chains and select the correct ones. (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation. (ii) Removal of most of the carnivores resulted in an increased population of deers. (iii) The lenght of food chains is generally limited to 3-4 trophic levels due to energy loss. (iv) The lenght of food chains may vary from 2 to 8 trophic levels. A) i and ii B) ii and iii C) i and iii D) iii and iv

Consider the following three statements related to the human male reproductive system and select the correct option stating which ones are true (T) and which ones are false (F). (i) Middle piece of spermatozoon is also termed as power house of spermatozoon. (ii) Vas deferens joins a duct from seminal vesicle and form vasa efferentia. (iii) Semen is a collection of secretions from the seminal vesicles, prostate gland and Cowper's glands and sperms from testes.

Assertion : Some female animals permit copulation only during oestrous cycle. Reason : Oestrous cycle is observed in non-primate mammals.

Read the following statements regarding arithmetic growth and select the correct answer. (i) Rate of growth is constant. (ii) One daughter cell remains meristematic while the other one differentiates and matures. (iii) Mathematical expression is L_(t) = L_(0) +rt .

Read the following statements and select the correct ones. (i) Electrophoresis is a technique used for the separation of molecules based on their size and charge. (ii) Plasmids are extra-chromosomal, self-replicating, usually circular, double stranded DNA molecules found naturally in many bacteria and also in some yeast,. (iii) It is not advisable to use an exonuclease enzyme while producing a recombinant DNA molecule. (iv) In EcoRl, the roman numberal I indicates that it was the first enzyme isolated from E.coli A) (i) and (ii) B) (iii) and (iv) C) (i),(ii) and (iv) D) (i),(ii),(iii) and (iv)

Read the following statements and select the correct ones. (i) Conidia are the asexual propagules restricted to Kingdom Fungi. (ii) Apiece of potato tuber having at least one eye (or node) is capable of giving rise to a new plant. (iii) Ginger propagates vegetatively with the help of its underground roots. (iv) Fleshy buds which take part in vegetative propagation are called bulbilsm present in Dioscorea, Agave, etc.