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Published on: 24/05/2021
QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test1.
In an embryo sac, the cells that degenerate after fertilisation are
Synergids and primary endosperm cell.
Synergids and antipodals
Antipodals and primary endosperm cell.
Egg and antipodals.
2.
In a fertilised embryo sac, the haploid, diploid and triploid structures are:
Synergid, zygote and primary endosperm nucleus.
Synergid, antipodal and polar nuclei.
Antipodal, synergid and primary endosperm nucleus.
Synergid, polar nuclei and zygote
3.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Monoecious plant bearing unisexual flowers.
Dioecious plant bearing only male or female flowers.
Monoecious plant with bisexual flowers.
Dioecious plant with bisexual flowers.
4.
Choose the correct statement from the following.
Cleistogamous flowers always exhibit autogamy
Chasmogamous flowers always exhibit geitonogamy.
Cleistogamous flowers exhibit both autogamy and geitonogamy.
Chasmogamous flowers never exhibit autogamy.
5.
Nucellar polyembryony is reported in species of
Citrus
Gossypium
Triticum
Brassica
6.
While planning for an artificial hybridization programme involving dioecious plants, which of the following steps will be irrelevent:
Bagging of female flower
Dusting of pollen on stigma
Emasculation
Collection of pollen
7.
From the statements given below choose the option that is true for a typical female gametophyte of a flowering plant:
i) It is 8-nucleate and 7-celled at maturity
ii) It is free nuclear during development
iii) It is situated inside the integument but outside the nucellus
iv) It has an egg apparatus situated at the chalazal end.
i) and iv)
ii) and iii)
i) and ii)
ii) and iv)
8.
The outermost and innermost wall layers of microsporangium in an anther are respectively
Endothecium and tapetum
Epidermis and endodermis
Epidermis and middle layers
Epidermis and tapetum
9.
From among the sets of terms given below, identify those that are associated with gynoecium.
Stigma, ovule, embryo sac, placenta
Thalamus, pistil, style, ovule
Ovule, ovary, tapetum, embryo sac
Egg, integument, embryo sac, nucellus
10.
Embryo sac is to ovule __________ is to an anther
Stamen
Filament
Pollen grain
Androecium
1.
(b)
Synergids and antipodals
2.
(a)
Synergid, zygote and primary endosperm nucleus.
3.
(b)
Dioecious plant bearing only male or female flowers.
4.
(a)
Cleistogamous flowers always exhibit autogamy
5.
(a)
Citrus
6.
(c)
Emasculation
7.
(c)
i) and ii)
8.
(a)
Endothecium and tapetum
9.
(a)
Stigma, ovule, embryo sac, placenta
10.
(c)
Pollen grain
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