CBSE 12 Biology Question Paper-2024 Set-5 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Biology Question Paper-2024 Set-5
CBSE 12 Biology Question Paper-2024 Set-5

CBSE 12 Biology Question Paper-2024 Set-5

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2024 Set-5, helping students understand exam trends and practice real paper format

2025-08-17
Pavan Pavan
CBSE Class 12 Biology 2024 Grade 12

Duration

19 min

Questions

16

Marking

Negative

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Questions Preview

A single gene that controls the expression of more than one trait is said to show

A
Pleiotropism
B
Polygenic inheritance
C
Incomplete dominance
D
Multiple allelism

A person with trisomy of 21st chromosome shows
(i) Furrowed tongue
(ii) Characteristic palm crease
(iii) Rudimentary ovaries
(iv) Gynaecomastia
Select the correct option, from the choices given below:

A
(i), (ii) and (iv)
B
(ii) and (iv)
C
(i) and (ii)
D
(ii) and (iii)

Observe the schematic representation of assisted reproductive technology given below:

Identify the most appropriate technique depicted in the above diagram.

A
IUI
B
ICSI
C
IUT
D
ZIFT

Interferons are proteins secreted by

A
WBC
B
Bacteria infected cell
C
Virus infected cell
D
RBC

During biological treatment of sewage, the masses of bacteria held together by fungal filaments to form mesh like structures are called

A
flocs
B
primary sludge
C
activated sludge
D
anaerobic sludge

Which one of the following statements is correct in the context of observing DNA separation by agarose gel electrophoresis?

A
Ethidium bromide stained DNA can be seen under UV light.
B
DNA can be seen in visible light.
C
DNA can be seen without staining in visible light.
D
Ethidium bromide stained DNA can be seen in visible light

A phenomenon where a male insect mistakenly identified the patterns of a orchid flower as the female insect partner, and tries to copulate and thereby pollinates the flower is said to be :

A
Pseudoparthenocarpy
B
Pseudocopulation
C
Pseudofertilisation
D
Pseudopollination

Identify the correct labellings in the figure of a fertilised embryo sac of an angiosperm given below :

A
A degenerating synergids, B zygote, C degenerating antipodals, D-PEN
B
A degenerating antipodals, B PEN, C degenerating synergids, D - zygote
C
A zygote, B degenerating synergids, C degenerating antipodals, D-PEN
D
A degenerating synergids, B zygote, C PEN, D degenerating antipodals

Study the pedigree chart of a family showing the inheritance pattern of a certain disorder. Select the option that correctly identifies the nature of the trait depicted in the pedigree chart.

A
Autosomal dominant
B
Recessive X - linked
C
Autosomal recessive
D
Dominant X - linked

Match the following genes of the lac operon listed in column 'A' with their respective products listed in column 'B':

A
Gene
Products
a. 'i' gene
(i) β-galactosidase
b. 'z' gene
(ii) lac permease
C. 'a' gene
(iii) repressor
d. 'y' gene
(iv) transacetylase
Select the correct option:

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

If both the parents are carriers for thalassaemia, the chances of an afflicted child to be born to them is:

A
25%
B
50%
C
75%
D
100%

If the sequence of nitrogen bases of the coding strand in a transcription unit is 5'-ATGAATG-3', the sequence of bases in its RNA transcript would be

A
5'-UACUUAC - 3'
B
5'-AUGAAUG - 3'
C
5'-CAUUCAU – 3'
D
5'-GUAAGUA - 3'

How many base pairs will be there in 20 nucleosomes in a DNA double helix?

A
20
B
2000
C
4000
D
40

Single step large mutation leading to speciation is also called

A
founder effect
B
saltation
C
branching descent
D
natural selection

Which one of the following enzymes a fungal cell should be treated with to get the DNA along with other macro molecules released from it?

A
Isozymes
B
Cellulose
C
Ribonuclease
D
Chitinase

Which one of the following is not a characteristic feature of "humus" that is formed during decomposition of detritus?

A
amorphous, colloidal, light coloured substance
B
amorphous, colloidal, dark coloured substance
C
substance resistant to microbial action
D
colloidal substance