12th Standard CBSE Syllabus & Materials
12th Standard CBSE
CBSE 12th Biology Sexual Reproduction in Flowering Plants Important Questions And Answers Study Material - QB365 Set B
NEW12th Standard CBSE
CBSE 12th Biology Sexual Reproduction in Flowering Plants Important Questions And Answers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Biology Sexual Reproduction in Flowering Plants Assertion and Reason Study Material - QB365 Set D
NEW12th Standard CBSE
CBSE 12th Biology Sexual Reproduction in Flowering Plants Assertion and Reason Study Material - QB365 Set C
NEW12th Standard CBSE
CBSE 12th Biology Sexual Reproduction in Flowering Plants Assertion and Reason Study Material - QB365 Set B
NEW12th Standard CBSE
CBSE 12th Biology Sexual Reproduction in Flowering Plants Assertion and Reason Study Material - QB365 Set A
Published on: 25/05/2021
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Questions + Answers key
Take MCQ Biology Test1.
Bio fertilisers include:
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
Blue-green algae, rhizobia and other nitrogen fixings bacteria
Rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
Blue green algae, rhizobia and mycorrhiza fungi
2.
Methanogens, growing anaerobically on cellulosic material, produce
Methane
Methane and carbon dioxide
Methane and hydrogen
Methane, carbon dioxide and hydrogen.
3.
In fermentation of dough which is the main gas produced?
Carbon dioxide
Hydrogen
Both (a) and (b)
Methane
4.
The residue left after methane production from cattle dung is
burnt
burried in land fills
used as manure
used in civil construction
5.
Activated sludge should have the ability to settle quickly so that it can
be rapidly pumped back from sedimentation to aeration tank
absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank
be discarded and anaerobically digested
absorb colloidal organic matter
6.
Which one is the most important role of microorganism of the well being of humans?
sewage treatment
production of methane
production of SO2
conversion of milk to curd
7.
Match the items in column 'A' and column 'B' and choose correct answer
| Column 'A' | Column 'B' |
| (i) Lady bird | (a) Methanobacterium |
| (ii) Mycorrhiza | (b) Trichoderma |
| (iii) Biological control | (c) Aphids |
| (iv) Bio-gas | (d) Glomus |
(i)-(b), (ii)-(d), (iii)-(c), (iv)-(a)
(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
(i)-(d), (ii)-(a), (iii)-(b), (iv)-(c)
(i)-(c), (ii)-(b), (iii)-(a), (iv)-(d)
8.
The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria
vitamin C
vitamin D
vitamin B12
vitamin E.
9.
Which one of the following alcoholic drinks is produced without distillation?
Wine
Whisky
Rum
vitamin E.
1.
(a)
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
2.
(d)
Methane, carbon dioxide and hydrogen.
3.
(a)
Carbon dioxide
4.
(c)
used as manure
5.
(a)
be rapidly pumped back from sedimentation to aeration tank
6.
(a)
sewage treatment
7.
(b)
(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
8.
(c)
vitamin B12
9.
(a)
Wine
12th Standard CBSE Syllabus & Materials
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