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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Reproduction in Flowering Plants of Biology.
46
A clone is a group of individuals obtained through
[1]
Self pollination
[2]
Vegetative propagation
[3]
Hybridization
[4]
Cross pollination
Answer: Vegetative propagation
47
Cleistogamous condition is present in
[1]
Brassica
[2]
Solanum tuberosum
[3]
Commelina
[4]
Allium cepa
48
The pollen are liberated in Cassytha by:
[1]
Transverse dehiscence
[2]
Longitudinal dehiscence
[3]
Porous dehiscence
[4]
Valvular dehiscence
Answer: Valvular dehiscence
49
How many microspore mother cell will produce 1000 microspores?
[1]
100
[2]
250
[3]
200
[4]
500
50
What is the collar like outgrowth developing fromthe base of the ovule and forming a sort of third integument?
[1]
Caruncle
[2]
Crona
[3]
Operculum
[4]
Aril
51
Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called
[1]
Geitonogamy
[2]
Xenogamy
[3]
Autogamy
[4]
Karyogamy
52
Which one of the following statements is wrong?
[1]
Intine is made up of cellulose and pectin
[2]
Vegetative cell is larger than generative cell
[3]
Pollen grains in some plants remain viable for months
[4]
When pollen is shed at two-celled stage, double fertilization does not take place
Answer: When pollen is shed at two-celled stage, double fertilization does not take place
53
There are 10 flowers in one individual plant of Crotalaria. In each microsporangium of every stamen of all the flowers, there are 30 microspore mother cells. How many pollen grains are formed from that plant?
[1]
4,000
[2]
10,000
[3]
48,000
[4]
24,000
54
Egg apparatus consists of
[1]
Egg
[2]
Egg and antipodal cells
[3]
Egg and polar nuclei
[4]
Egg and synergids
Answer: Egg and polar nuclei
55
An interesting modification of flower shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern on the orchid flower for the female of his species and tries to copulate with it, thereby pollinating the flower. This phenomenon is called
[1]
Pseudo parthenocarpy
[2]
Pseudo pollination
[3]
Pseudo copulation
[4]
Pseudocopulation
56
Hypanthodium refers to a special type of
[1]
inflorescence
[2]
ovary
[3]
fruit
[4]
flower
57
Embryo sac is found in
[1]
Endosperm
[2]
Embryo
[3]
Seed
[4]
Ovule
58
Double fertilization involves:
[1]
Fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube.
[2]
Fertilization of the egg by two male gametes
[3]
Fertilization of the egg and the central cell by two sperms brought by the same pollen tube
[4]
Fertilization of the egg and the central cell by two sperms brought by different pollen tubes.
Answer: Fertilization of the egg and the central cell by two sperms brought by the same pollen tube
59
In a flowering plant archesporium gives rise to
[1]
only the wall of the sporangium
[2]
wall and the tapetum
[3]
both wall and the sporogenous cells
[4]
only tapetum and sporogenous cells
Answer: both wall and the sporogenous cells
60
In which one of the following, male and female gametophytes do not have free living independent existence?
[1]
Polytrichum
[2]
Funaria
[3]
Cedrus
[4]
Pteris
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