M.C.Q

MCQ 11 Mark

Spinal cord originates from:

A
cerebellum
B
pons
✓
medulla
D
cerebrum

Answer

Correct option: C.

medulla

(C) medulla
Explanation:
The brain is divided into three regions (i) Forebrain (ii) Midbrain and (iii) Hindbrain. The forebrain is the largest part of the brain. It is the main thinking region. It is made up of cerebrum, hypothalamus, and thalamus. The midbrain does not have any further divisions. The hindbrain consists of the cerebellum, pons, and medulla. The spinal cord is a cylindrical structure that begins in continuation with the medulla and extends downwards within the vertebral column from the medulla oblongata to the number region.

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MCQ 21 Mark

Which of the following is incorrect about self-pollination:
A. The genetic drifts of the breed can be removed
B. New varieties cannot be obtained by self-pollination
C. Repeated self-pollination leads to loss of vigour and vitality of species
D. It helps to preserve the parental characters

A
(B)
✓
(A)
C
(C)
D
(D)

Answer

Correct option: B.

(A)

(B) (A)
Explanation:
Genetic drift cannot be removed by self pollination.

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MCQ 31 Mark

Use of high temperature for waste disposal is called _____________ .

A
Composting
✓
Incineration
C
Landfilling
D
Recycling

Answer

Correct option: B.

Incineration

(B) Incineration
Explanation:
Incineration is the process of burning substances under aerobic conditions at high temperature (usually more than 1000∘⁢C ) in a closed unit called incinerator.

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MCQ 41 Mark

The following are the sketches made by some students. The sketch not illustrative of budding in yeast is :e

✓
C
B
B
C
A
D
D

Answer

Correct option: A.

(A) C
Explanation:
Buds appear as protuberance. In C all the cells are separate and single.

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MCQ 51 Mark

A star-shaped black paper was used to cover a leaf in a destarched plant as shown below. The plant was left in sunlight for four hours and then the leaf was plucked, black paper removed and tested for the presence of starch. The areas which turned blue-black when iodine solution was added were

A
only II
B
I, II, III, IV
✓
I, III, IV
D
only IV

Answer

Correct option: C.

I, III, IV

(C) I, III, IV
Explanation:
Photosynthesis takes place in the uncovered part which turns blue black when tested with iodine.

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MCQ 61 Mark

The genotype for the height of an organism is Tt . What conclusion may be drawn from this?

A
There is one allele for height with two
✓
There are at least two different alleles for different forms. the gene for height.
C
here are two different genes for height,
D
The allele for height has at least two each having a single allele. different genes.

Answer

Correct option: B.

There are at least two different alleles for different forms. the gene for height.

(B) There are at least two different alleles for the gene for height.
Explanation:
Genotype is the genetic composition of an organism, i.e., the combination of alleles it possesses. Every character in an organism is controlled by a gene that has at least two alleles that lie on the two homologous chromosomes at the same locus. These alleles may represent the same (homozygous, e.g., TT for height)or alternate expressions (heterozygous, e.g., Tt) of the same character. Thus, if genotype for the height of an organism is Tt , this means there are at least two different alleles for the gene for height, one is T and the other is t .

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MCQ 71 Mark

Sex determination depends upon the environment in

✓
Reptiles
B
Birds
C
Amphibians
D
Fishes

Answer

Correct option: A.

Reptiles

(A) Reptiles
Explanation:
Reptiles

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