Question Set B

CBSE 10th Science Heredity Sample Question Papers Study Material - QB365

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Questions:

Multiple Choice Question

An example of homologous organs is

(a)

Our arm and a dog's fore-leg

(b)

Our teeth and an elephant's tusks.

(c)

Potato and runners of grass.

(d)

all of the above

In evolutionary terms, we have more in common with

(a)

A Chinese school-boy.

(b)

A chimpanzee

(c)

A spider

(d)

A bacterium

Exchange of genetic material takes place in

(a)

vegetative reproduction

(b)

asexual reproduction

(c)

sexual reproduction

(d)

budding

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be

(a)

double fertilisation

(b)

self pollination

(c)

cross fertilisation

(d)

no fertilisation

A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because

(a)

tallness is the dominant trait

(b)

shortness is the dominant trait

(c)

tallness is the recessive trait

(d)

height of pea plant is not governed by gene 'T' or 't'

Which of the following statement is incorrect?

(a)

For every hormone there is a gene

(b)

For every protein there is a gene

(c)

For production of every enzyme there is a gene.

(d)

For every molecule of fat there is a gene.

If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in FI generation are

(a)

round and yellow

(b)

round and green

(c)

wrinkled and green

(d)

wrinkled and yellow

In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are.
(i) large chromosome
(ii) small chromosome
(iii) Y - chromosome
(iv) X - chromosome

(a)

(i) and (ii)

(b)

(iii) only

(c)

(iii) and (iv)

(d)

(ii) and (iv)

The maleness of a child is determined by

(a)

the X chromosome in the zygote

(b)

the Y chromosome in zygote

(c)

the cytoplasm of germ cell which determines the sex.

(d)

sex is determined by chance

10.

A zygote which has an X - chromosome inherited from the father will develop into a

(a)

boy

(b)

girl

(c)

X - chromosome does not determine the sex of a child

(d)

either boy or girl

11.

Select the incorrect statement

(a)

Frequency of certain genes in a population change over several generations resulting in evolution.

(b)

Reduction in weight of the organism due to starvation is genetically controlled.

(c)

Low weight parents can have heavy weight progeny

(d)

Traits which are not inherited over generations do not cause evolution.

12.

New species may be formed if
(i) DNA undergoes significant changes in germ cells
(ii) chromosome number changes in the gamete
(iii) there is no change in the genetic material
(iv) mating does not take place

(a)

(i) and (ii)

(b)

(i) and (iii)

(c)

(ii), (iii) and (iv)

(d)

(i), (ii) and (iii)

13.

Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F₁ progeny that have round, yellow (RrYy) seeds. When F₁ plants are selfed, the F₂ progeny will have new combination of characters. Choose the new combination from the following:
(i) Round, yellow
(ii) Round, green
(iii) Wrinkled, yellow
(iv) Wrinkled, green

(a)

(i) and (ii)

(b)

(i) and (iv)

(c)

(ii) and (iii)

(d)

(i) and (iii)

14.

A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?

(a)

Carrot and potato

(b)

Carrot and tomato

(c)

radish and carrot

(d)

radish and potato

15.

Select the correct statement

(a)

Tendril of a pea plant and phylloclade of Opuntia are homologous.

(b)

Tendril of a pea plant and phylloclade of Opuntia are analogous

(c)

Wings of birds and limbs of lizards are analogous

(d)

Wings of birds and wings of bat are homologous

16.

From the list given below, select the character which can be acquired but not inherited

(a)

colour of eye

(b)

colour of skin

(c)

size of body

(d)

nature of hair

17.

The two versions of a trait (character) which are brought in by the male and female gametes are situated on

(a)

copies of the same chromosome

(b)

two different chromosomes

(c)

sex chromosomes

(d)

any chromosome

18.

Select the statements that describe characteristics of genes
(i) genes are specific sequence of bases in a DNA molecule
(ii) a gene does not code for proteins
(iii) in individuals of a given species, a specific gene located on a particular chromosome
(iv) each chromosome has only one gene.

(a)

(i) and (ii)

(b)

(i) and (iii)

(c)

(i) and (iv)

(d)

(ii) and (iv)

19.

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F₂ is

(a)

1 : 3

(b)

3 : 1

(c)

1 : 1

(d)

2 : 1

20.

The number of pair (s) of sex chromosomes in the zygote of humans is

(a)

one

(b)

two

(c)

three

(d)

four

21.

The theory of evolution of species by natural selection was given by

(a)

Mendel

(b)

Darwin

(c)

Morgan

(d)

Lamarck

22.

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that

(a)

reptiles have evolved from birds

(b)

there is no evolutionary connection between reptiles and birds

(c)

feathers are homologous structures in both the organisms

(d)

birds have evolved from reptiles.

23.

Which one of the following is not one of the direct conclusions that can be drawn from Mendel's experiment?

(a)

Only one parental trait is expressed

(b)

Two copies of each trait is inherited in sexually reproducing orgainsm

(c)

For recessive trait to be expressed, both copies should be identical

(d)

Natural selection can alter frequency of an inherited trait

24.

Which one is a possible progeny in F₂ generation of pure breed tall plant with round seed and short plant with wrinkled seeds?

(a)

Tall plant with round seeds

(b)

Tall plant with wrinkled seeds

(c)

Short plant with round seed

(d)

All of the above

25.

A section of DNA providing information for one protein is called

(a)

Nucleus

(b)

Chromosomes

(c)

Trait

(d)

Gene

26.

Which of the following is a totally impossible outcome of Mendel's Experiment (cross breeding pure breed tall and short pea plants)

(a)

3 tall 1 short plant

(b)

24 tall and 8 short plants

(c)

8 tall and 0 short plants

(d)

4 tall plants and 1 medium-height plant.

27.

Which of the following is controlled by genes?
(i) Weight of a person (ii) Height of a person

(a)

only 1 (i)

(b)

only (ii)

(c)

both (i) and (ii)

(d)

Sometimes (i) and sometimes (ii)

28.

Which one of the following is present in the nucleus?

(a)

Gene

(b)

DNA

(c)

Chromosomes

(d)

All of these

29.

Amongst which of the following animals, sex of the off springs not genetically determined

(a)

Humans

(b)

Snails

(c)

Birds

(d)

Dogs

30.

What is the probability that a human progeny will be a boy

(a)

50%

(b)

56%

(c)

47.34%

(d)

It varies

31.

Who have a perfect pair of sex chromosomes

(a)

Girls only

(b)

Boys only

(c)

Both girls and boys

(d)

It depends on many other factors

32.

There is an inbuilt tendency of variation during reproduction because of-
(i) Errors in DNA copying (ii) Sexual reproduction

(a)

only (i)

(b)

only (ii)

(c)

both (i) and (ii)

(d)

none of them

33.

Which one of the following gives a survival advantage and thus alters frequency of inherited trait.
(i) natural selection (ii) genetic drift

(a)

only (i)

(b)

only (ii)

(c)

both (i) and (ii)

(d)

none of these

34.

If we breed a group of squirrels and surgically remove their tails, then amongst the progeny of these tailless squirrels

(a)

All have no tail

(b)

All have a tail

(c)

Some of them have tails

(d)

Cannot be determined

35.

With whom we associate theory of evolution

(a)

Charles Darwin

(b)

Mendel.

(c)

Stanley Miller

(d)

Harold Urey

36.

Formation of 2 independent species due to genetic drift, geographical isolation, natural selection is specifically referred as-

(a)

Evolution

(b)

Classification

(c)

Speciation

(d)

Reproduction

37.

Which of the following can be called a characteristic?

(a)

Plants can photosynthesise

(b)

We have 2 eyes

(c)

Mango tree is multicellular

(d)

All of these

38.

If A and B have n characteristics common while A and C have n/2 characteristics common, then which of the two organisms are more closely related?

(a)

A and C

(b)

A and B

(c)

Characteristics need to be known

(d)

None of these

39.

Homologous organs have

(a)

Same structure, same function

(b)

Different structure, different function

(c)

Same structure, different function

(d)

Same function, different structure

40.

Analogous organs have

(a)

Same structure, same function

(b)

Different structure, different function

(c)

Same structure, different function

(d)

Same function, different structure

41.

Fossils helps

(a)

To study evolution

(b)

To understand climatic conditions in past

(c)

For a hierarchy of organisms (classification

(d)

They help in all the above

42.

How can we know how old fossils are:

(a)

Fossils found closer to surface are recent than those found much below

(b)

Detecting ratios of isotopes

(c)

Studying its characteristics

(d)

All of these

43.

Which one of the following strongly indicates that bird and dinosaurs are closely related?

(a)

They both have feathers

(b)

They both respire

(c)

They both reproduce

(d)

They both have eyes

44.

Wild cabbage is being cultivated for thousands of years and humans have generated broccoli, cauliflower, kala etc. from it. This is an example of

(a)

Natural selection

(b)

Genetic drift

(c)

Geographic isolation

(d)

Artificial selection

45.

Organism A recently carne into existence while B was formed millions of years ago. What does this indicate?
(i) A is more efficient than B (ii) A is more complex than B.

(a)

Only (i)

(b)

Only (ii)

(c)

Both (i) and (ii)

(d)

Either (i) or (ii)

46.

Which of the following statements is not true with respect to variation?

(a)

All variations in a species have equal chance of survival

(b)

Change in genetic composition results in variation

(c)

Selection of variants by environmental factors forms the basis of evolutionary processes

(d)

Variation is minimum in asexual reproduction

47.

The below given figure gives details about different contrasting pairs of characters selected by Mendel for his experiments to observe carefully and select the number of traits related to flower pod and seed, respectively.

(a)

2, 2, 2

(b)

2, 2, 1

(c)

1, 1, 2

(d)

1, 1, 1

48.

Consider the following two statements
(i) The trait that expresses itself in F₁-generation.
(ii) The trait that keeps on passing from one generation to another.
The appropriate terms for the statements (i) and (ii) respectively are

(a)

(i)	(ii)
Recessive trait,	Dominant trait

(b)

(i)	(ii)
Dominant trait,	Recessive trait

(c)

(i)	(ii)
Dominant trait,	Inherited trait

(d)

(i)	(ii)
Recessive trait,	Inherited trait

49.

A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F₂-progeny in which ratio of violet (VV) and white (vv) flowers will be

(a)

1 : 1

(b)

2 : 1

(c)

3 : 1

(d)

1 : 3

50.

If a tall pea plant is crossed with a pure dwarf pea plant then, what percentage of F₁ and F₂-generation respectively will be tall?

(a)

25%, 25%

(b)

50%, 50%

(c)

75%, 100%

(d)

100%, 75%

51.

A cross between two tall pea plants resulted in offsprings having a few dwarf plants. The gene-combination of the parental plants must be

(a)

Tt and Tt

(b)

Tt and tt

(c)

TT and tt

(d)

TT and Tt

52.

A homozygous dominant guinea pig with black fur is crossed with a homozygous guinea pig with white fur. The F₁-generation is crossed with itself.
What percentage of F₂ - generation is expected to show white fur coat?

(a)

25%

(b)

50%

(c)

75%

(d)

100%

53.

The statement that correctly describes the characteristic of a gene is

(a)

in individuals of a given species, a specific gene is located on a particular chromosome

(b)

a gene is not the information source for making proteins in the cell

(c)

each chromosome has only one gene located all along its length

(d)

all the inherited traits in human beings are not controlled by genes

54.

Which pair of sex chromosome will determine a male ?

(a)

(b)

(c)

(d)

55.

Below given is the pattern of sex-determination in human beings. Study the same and choose the correct statement.

(a)

Both mother and father have 22 pairs of chromosomes including sex chromosomes

(b)

The gametes of both mother and father are haploid (n) in nature

(c)

It is Y-chromosome that decides the sex of a child

(d)

Both (b) and (c)

56.

Which Mendelian law states that inheritance of one character is always independent to the inheritance of other character within the same individual?

(a)

Law of dominance

(b)

Law of segregation

(c)

Law of independent assortment

(d)

Both (b) and (c)

57.

A homozygous cross between a pea plant having purple flowers is done with the homozygous pea plant having white flower. What will be the phenotypic ratio of the offspring obtained is F₂-generation

(a)

2 : 1

(b)

1 : 1

(c)

1 : 2 : 2

(d)

3 : 1

58.

Sex determination depends upon the environment in

(a)

birds

(b)

amphibians

(c)

reptiles

(d)

fishes

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Answers Key:

Multiple Choice Question

(d)
all of the above

(a)
A Chinese school-boy.

(b)
self pollination

(a)
tallness is the dominant trait

(d)
For every molecule of fat there is a gene.

(a)
round and yellow

(b)
the Y chromosome in zygote

10.

(b)
girl

11.

(b)
Reduction in weight of the organism due to starvation is genetically controlled.

12.

(a)
(i) and (ii)

13.

(b)
(i) and (iv)

14.

15.

(a)
Tendril of a pea plant and phylloclade of Opuntia are homologous.

16.

17.

(a)
copies of the same chromosome

18.

(b)
(i) and (iii)

19.

20.

(a)
one

21.

(b)
Darwin

22.

(d)
birds have evolved from reptiles.

23.

(d)
Natural selection can alter frequency of an inherited trait

24.

(d)
All of the above

25.

(d)
Gene

26.

(d)
4 tall plants and 1 medium-height plant.

27.

(b)
only (ii)

28.

(d)
All of these

29.

(b)
Snails

30.

(a)
50%

31.

(a)
Girls only

32.

(b)
only (ii)

33.

(a)
only (i)

34.

(b)
All have a tail

35.

(a)
Charles Darwin

36.

37.

(d)
All of these

38.

39.

40.

(d)
Same function, different structure

41.

(d)
They help in all the above

42.

(d)
All of these

43.

(a)
They both have feathers

44.

(d)
Artificial selection

45.

46.

(a)
All variations in a species have equal chance of survival

47.

(a)
2, 2, 2

48.

49.

50.

(d)
100%, 75%

51.

(a)
Tt and Tt

52.

(a)
25%

53.

(a)
in individuals of a given species, a specific gene is located on a particular chromosome

54.

55.

(d)
Both (b) and (c)

56.

57.

(d)
3 : 1

58.

CBSE 10th Science Heredity Sample Question Papers Study Material - QB365 Set B

QB365 Student Learing Managemnet System

Std: 10th Standard CBSE - Science

chapter: Heredity - Sample Question Papers

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