Daily Practice Problems
Class 12 Biology
daily practice problem

Question 1:

Choose the correct options:

1. Darwin’s finches are good example of:

(a) Connecting links

(b) Missing links

(c) Adaptive radiation

(d) Convergent evolution


2. Which among the following gases was not present in the primitive earth’s atmosphere?

(a) Oxygen

(b) Methane

(c) Hydrogen

(d) Water vapours


3. Which among the following deals with the fossil evidences of evolution?

(a) Embryology

(b) Palaeontology

(c) Biogeography

(d) Anatomy


4. The human fossils which were first to bury their dead and used hides to protect their body?

(a) Homo neanderthalensis

(b) Homo erectus

(c) Homo habilis

(d) Ramapithecus

Question 2:

Name the following:

1. The scientist who proposed the idea of the survival of fittest.

2. The single step large scale mutations that caused evolution.

3. Addition or loss of alleles from the population by chance alone.

4. The term given to the formation of new life from the pre-existing life.

5. A classical example of natural selection witnessed both pre- and post-industrialisation in England.


Question 3:

Fill in the blanks with appropriate words:

1. The phenomenon of industrial melanism demonstrate __________.

2. The most accepted theory of origin of life was proposed by __________ and __________.

3. The theory of use and disuse of organ was proposed by ___________.

4. The idea of mutations was brought forth by ___________.

5. Coccyx and muscles of external ear are examples of _____________ organs.


Question 4:

Classify the following as either homologous or analogous organs:

1. Thorns of Bougainvillea and tendrils of Cucurbita.

2. Heart of fishes and humans.

3. Forelimbs of whales and cheetah.

4. Eyes of octopus and mammals.

5. Flippers of Dolphins and penguins.



Question 5:

Draw a well labelled diagram of the apparatus set up by Stanley Miller and Harold Urey to demonstrate the experimentally the chemosynthetic origin of life.


Question 6:

Define the following terms:

1. Homologous organ

2. Natural selection

3. Founder’s effect

4. Convergent evolution

5. Adaptive radiation


Question 7:

Match the columns A and B.

             Column A

Column  B

1. Nictitating membrane

  a. Homologous organs

2. Forelimbs of bats and humans

  b. Darwin’s finches

3. Galapagos islands

  c. Chemosynthetic origin of life

4. Charles Darwin

  d. Vestigial organs

5. Oparin and Haldane

  e. Theory of natural selection


Question 8:

State whether the following statements are true or false.

1. The Big Bang theory attempts to explain the origin of universe.

2. Analogous organs arise due to convergent evolution.

3. Mutations are random and directional.

4. Dryopithecus was more man-like and Ramapithecus was more ape-like.

5. de Vries’ saltation referred to single step large mutations.


Question 9:

Name the scientists who experimentally rejected the theory of abiogenesis.


Question 10:

What does the theory of biogenesis state?


Question 11:

Name the scientists who proposed the chemosynthetic origin of life.


Question 12:

Name the gases taken by Miller and Urey in their experiment to support biochemical origin of life. Why were these gases taken?


Question 13:

In what ways the tendrils of vine and pea are analogous structures?


Question 14:

What does the presence of vermiform appendix in humans indicate?


Question 15:

In what ways were the finches observed by Darwin on the Galapagos Islands different? How did Darwin account for his observations?


Question 16:

Imagine you discovered a fossil of a bird with scales on the body and teeth in its beak. What would you conclude about its position in the animal kingdom?


Question 17:

A man can hold objects by his hands and an elephant by its trunk. Are these two organs analogous or homologous? Give a valid reason for your conclusion.


Question 18:

State the Hardy-Weinberg principle. What is its significance?


Question 19:

With the help of a flowchart, trace the line of human evolution.


Question 20:

Give any two embryological evidences of evolution.