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CBSE - Class 10 Science Heredity and Evolution Worksheet

1.

What are the combinations of character in the $F_2$ progeny? What are their ratios?

2.
Exchange of genetic material takes place in
a. vegetative reproduction b. asexual reproduction c. sexual reproduction d. budding
3.
According to the evolutionary theory, formation of a new species is generally due to
a. sudden creation by nature b. accumulation of variations over several generations c. clones formed during asexual reproduction d. movement of individuals from one habitat to another
4.

Study the following cross and showing self pollination in $F_1$, fill in the blank and answer the question that follows.

 

5.
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
6.
How is the sex of a newborn determined in humans?
7.

In the following crosses write the characteristics of the progeny

In the following crosses write the characteristics of the progeny - CBSE Class 10 Science - Learn CBSE Forum

8.
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
9.
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
10.
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 is 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)
11.
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’
12.
In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in $F_2$ is
a. 1 : 3 b. 3 : 1 c. 1 : 1 d. 2 : 1
13.
Do genetic combination of mothers play a significant role in determining the sex of a new born?
14.
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
15.
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
16.
The number of pair (s) of sex chromosomes in the zygote of humans is
a. one b. two c. three d. four
17.
In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.
18.
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
19.
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)
20.
Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive (ii) round seed

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