Variation

Q.

"Evolution should not be equated with progress". Why?

Q. The differences in the characters (or traits) among the individuals of a species are called ___.

1. variation
2. heredity
3. alleles
4. speciation

Q. Formation of new species of plants and animals is the effect of evolution.

1. False
2. True

Q. Match the following:
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{p. Gene flow}& \text{i. Transfer of alleles from one population to another}\\ \text{q. Bottleneck effect}& \text{ii. A change in the frequency of alleles mainly due to chance events}\\ \text{r. Founder effect}& \text{iii. A sharp lowering of a population's gene pool due to natural disasters}\\ \text{s. Genetic drift}& \text{iv. A few members of the original population colonise a new location away from the old}\end{array}$

1. p-i, q-ii, r-iii, s-iv
2. p-ii, q-i, r-iii, s-iv
3. p-i, q-iii, r-iv, s-ii
4. p-ii, q-iii, r-iv, s-i

Q.

What are marker genes used for?

Q.

Which of the following statements is true about variation?

1. Varaiations always produce survival advantages

2. Variations help in organic evolution

3. Variations do not produce biodiversity

4. Variations always produce harmful effects in a population

Q. Variation are the basis of heredity.explain.

Q. Analogous structures indicates evolution while homologous structures indicate evolution.

1. divergent
2. convergent
3. branched
4. linear

Q.

What Causes Evolution?

Q.

Select the statements that describe the characteristics of genes

(i) Genes are a 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

1. (i) and (ii)

2. (i) and (iii)

3. (i) and (iv)

4. (ii) and (iv)

Q.

What are the Anatomical Evidences of Evolution?

Q.

What are the Anatomical Evidences of Evolution?

Q.

Explain giving an example of how the following provides evidence in favor of evolution in organisms. (i) Homologous organs (ii) Fossils

Q.

Who was Darwins coworker for Theory of Natural Selection?

Q.

Name the process/term for the following statements.

Evolution is related to living organisms.

Q.

The peppered moth experiment in which black moths become predominant over white moths during industrial revolution demonstrates phenotypic variation and natural selection

1. True

2. False

Q. Match the following.

1. Genetic drift
2. Artificial selection
3. Natural selection

Q.

From the pictures given below, state why are there are so many varieties in butterflies and chillies?

1. Mode of nutrition

2. Sexual reproduction

3. Temperature differences

4. Environment

Q.

The peppered moth experiment in which black moths become predominant over white moths during industrial revolution demonstrates _________ variation and natural selection

1. Phenotypic

2. Genotypic

3. Arial

4. Internal

Q. The peppered moth experiment in which black moths become predominant over white moths during industrial revolution demonstrates which of the following?

1. Phenotypic variation and natural selection.
2. Natural selection.
3. None of these.
4. Genotypic variation.

Q. Match the following.

1. Analogous
2. Natural Selection
3. Genetic Drift

Q.

Match the following:
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{p. Gene flow}& \text{i. Transfer of alleles from one population to another}\\ \text{q. Bottleneck effect}& \text{ii. A change in the frequency of alleles mainly}\text{due to chance events}\\ \text{r. Founder effect}& \text{iii. A sharp lowering of a population’s gene}\text{pool due to natural disasters}\\ \text{s. Genetic drift}& \text{iv. A few members of the original population}\text{colonise a new location away from the old}\end{array}$

1. p-i, q-ii, r-iii, s-iv
2. p-ii, q-i, r-iii, s-iv
3. p-i, q-iii, r-iv, s-ii
4. p-ii, q-iii, r-iv, s-i

Q. The difference in characters between the organisms of same species is called .

1. variation
2. evolution
3. speciation

Q.

The accumulation of favourable variations led to the appearance of new_______.

Q.

The peppered moth experiment in which black moths become predominant over white moths during industrial revolution demonstrates phenotypic variation and natural selection

Q. Assertion :Mutations occurring in the germinal cells of the gonads are called as germ mutations. Reason: They are heritable raw materials for natural selection lead to origin of new species.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.

Q. Which of the following agents can cause mutation?

1. Both A and B
2. Alcohol
3. U.V. rays
4. X rays

Q. The peppered moth experiment in which black moths become predominant over white moths during industrial revolution demonstrates which of the following?

1. Phenotypic variation and natural selection
2. Genotypic variation and mutation
3. Phenotypic variation and mutation
4. Genotypic variation and natural selection

Q.

The peppered moth experiment in which black moths become predominant over white moths during industrial revolution demonstrates phenotypic variation and natural selection

1. True

2. False

Q. Mutations are always harmful.

1. True
2. False