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Class X-Heredity and Evolution-Vasu Classes
1.
Mendel conducted his famous breeding experiments by working on:-
a) Pisum Sativum
b) Drosophila
c) Escherichiacoli
d) All of these
2.
Which of the following is an example of genetic variation?
a) One person has a scar, but his friend doesn’t
b) Two children have different eye colour
c) Reeta eats meat, but her sister Geeta is a vegetarian
d) One person is older than the other
3.
In peas, a pure tall (TT) is crossed with a pure short plant(tt). The ratio of pure tall plants to pure short plants in the F2 generation is:
a) 1:3
b) 1:1
c) 3:1
d) 4:1
4.
Humans have two different sex chromosomes, X and Y. Based on Mendel’s laws, a male offspring will inherit which combination of chromosomes?
a) combination of X chromosomes from either of its parents
b) both the Y chromosomes from one of its parents
c) combination of X chromosomes from either of its parents
d) combination of X and Y chromosomes from either of its parents
5.
Which of these is a pair of analogous organs?
a) forelimbs of a frog and a bird
b) wings of a pigeon and a bat
c) forelimbs of a rabbit and a lizard
d) leaves of a pitcher plant and a Venus fly trap
6.
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
7.
From the list given below, select the character which can be acquired but not inherited:
a) texture of hair
b) colour of skin
c) colour of eyes
d) size of body
8.
In humans, if gene B gives brown eyes and gene b gives blue eyes, what will be the colour of the eyes of the person having combination (i) Bb (ii) BB:
a) (i) Blue (ii) Blue
b) (i) Brown (ii) Blue
c) (i) Brown (ii) Brown
d) (i) Blue (ii) Brown
9.
Exchange of genetic material takes place in:-
a) Sexual reproduction
b) Asexual reproduction
c) Vegetative reproduction
d) Budding
10.
Human teeth and elephant’s tusk are
a) Homologous organs
b) Vestigeal organs
c) Analogous organs
d) Rudimentary organs
11.
Independent inheritance of two separate traits, shape and colour of seeds in Mendel’s cross on pea plants resulted in a observable ratio of:
a) 9 : 3 : 3 : 1
b) 1 : 1
c) 3 : 1
d) 9 : 4 : 2 : 1
12.
Which of these is not a vestigial organ in human beings?
a) Wisdom tooth
b) Gall bladder
c) Appendix
d) Nictitating membrane
13.
If the fossil of an organism is found in the deeper layers of Earth, then we can predict that
a) the extinction of organism has occurred thousands of years ago
b) the extinction of organism has occurred recently
c) the fossil position in the layers of Earth is not related to its time of extinction
d) time of extinction cannot be determined
14.
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
15.
Which one is a possible progeny in F2 generation of pure bred 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 these
16.
With whom you can associate theory of evolution?
a) Mendel
b) Stanley miller
c) Harold Urey
d) Charles Darwin
17.
The number of sex chromosomes in zygote of humans is_______.
a) 2
b) 4
c) 3
d) 1
18.
A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
a) O only
b) A only
c) AB
d) Equal chance of acquiring blood group A or blood group O.
19.
The human species has genetic roots in
a) Australia
b) Africa
c) America
d) None of these
20.
Identify the two organisms which are now extinct and are studied from their fossils.
a) dinosaur and fish (Knightia)
b) white tiger and sparrow
c) ammonite and white tiger
d) trilobite and white tiger
21.
The process by which new species develop from the existing species is known as
a) Evolution
b) Natural selection
c) Speciation
d) Artificial selection
22.
Process of selecting individuals with desired characters by man is called
a) Artificial selection
b) Natural selection
c) Hybridization
d) Reproduction
23.
The characteristics which will express in offspring even in presence of recessive traits are called as :
a) Dominant
b) Recessive
c) Acquired
d) None of these
24.
A basket of vegetables contains carrot, potato, radish and tomato. Which of them represents the correct homologous structures?
a) Radish and potato
b) Radish and carrot
c) Carrot and potato
d) Carrot and tomato
25.
A trait in an organism is influenced by
a) maternal DNA only
b) paternal DNA only
c) neither by paternal nor by maternal DNA
d) both maternal and paternal DNA
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