NCERT Exemplar solutions for Science [English] Class 10 chapter 9 - Heredity and Evolution [Latest edition]

Exchange of genetic material takes place in

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

Which of the following statement is incorrect?

If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in F₁ generation are

In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are

1. large chromosome
2. small chromosome
3. Y-chromosome
4. X-chromosome

The maleness of a child is determined by

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

Select the incorrect statement

New species may be formed if

1. DNA undergoes significant changes in germ cells
2. chromosome number changes in the gamete
3. there is no change in the genetic material
4. mating does not take place

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

1. Round, yellow
2. Round, green
3. Wrinkled, yellow
4. Wrinkled, green

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

Select the correct statement.

If the fossil of an organism is found in the deeper layers of earth, then we can predict that

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

A trait in an organism is influenced by

Select the group which shares maximum number of common characters

According to the evolutionary theory, formation of a new species is generally due to

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

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

Select the statements that describe characteristics of genes

1. genes are specific sequence of bases in a DNA molecule
2. a gene does not code for proteins
3. in individuals of a given species, a specific gene is located on a particular chromosome
4. each chromosome has only one gene

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

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

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

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

Give the pair of contrasting traits of the following characters in the pea plant and mention which is dominant and recessive

Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.

In the following crosses write the characteristics of the progeny

Study the following cross and showing self pollination in F₁, fill in the blank and answer the question that follows