CBSE Class 12 Biology 2025 Sample Paper Solved Set 3

SECTION A

1 Which of the following is correct about exponential growth model
(a) The population seldom grows beyond carrying capacity
(b) It occurs when resources are unlimited
(c) A stationary phase is reached
(d) It has four phases-lag, exponential, decelerating and asymptote

Answer : b

2 A cross between F1 hybrid and a recessive parent gives offspring in the ratio of
(a) 1:1
(b) 2:1
(c) 3:1
(d) 4:1

Answer : a

3 Choose the correct match.

(a). i b, ii c, iii a, iv d
(b). i d, ii b, iii a, iv c
(c). i d, ii a, iii d, iv c
(d). i c, ii d, iii b, iv a

Answer : d

4 The population of sparrows inhabiting a garden decreased dramatically. It was found that the mortality was equal to natality for the given population.
Which of the following is TRUE for the population of sparrows?
(a) The number of emigrants was equal to immigrants.
(b) The number of emigrants was less than immigrants.
(c) The number of emigrants was more than immigrants.
(d) The population of sparrows was unaffected by emigrants and Immigrants.

Answer : c

5 Select the option that has the correct sequence of events of human female reproductive cycle
(i) Secretion of FSH
(ii) Ovulation
(iii) Growth of corpus luteum
(iv) Growth of follicle and oogenesis
(v) Sudden increase in LH
options:
(a) (i) (iii), (v), (iv) (ii)
(b) (i) (iv), (v) (ii), (iii)
(c) (iv) (i), (v), (iii), (ii)
(d) (v) (ii), (iii), (iv) (i)

Answer : b

6 Match the contraceptive methods given under Column-I with their examples given under
Column-II and select the correct option from the codes given below

(a) A – (iv), B – (ii), C – (iii), D – (i)
(b) A – (iv), B – (ii), C – (iii), D – (i
(c) A – (i), B – (iii), C – (ii), D – (v)
(d) A – (iv), B – (ii), C – (v), D – (i)

Answer : a

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