Presence of gills in the tadpole of frog indicates that

De Vries gave his mutation theory on organic evolution while working on

The biogenetic law of Hackel is

Evolutionary history of an organism is known as

Which of the following are not analogous organs?

State the significance of biochemical similarities among diverse organisms in evolution.

State the significance of Coelacanth in evolution

How does a population become 'founders' of a new species?

Why are lichens regarded as pollution indicators?

Convergent evolution leads to analogous structures. Explain with the help of an example.

How do Darwin and de Vries differ in their views on the mechanism of evolution of life on earth?

When we say 'survival of the fittest', does it mean that:
(a) those whose are fit only survive or 
(b) those that survive are called fit? Comment.

Explain the term biogenesis.

Why are scientists searching for existence of life on other planets?

(a) Explain the theory of abiogenesis.
(b) How did Miller demonstrate experimentally the chemical evolution that happened three billion years ago?

(a) What is adaptive radiation?
(b) Explain with the help of a suitable example, where adaptive radiation has occurred to represent convergent evolution.

Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.

Comment on the statement that "evolution and natural selection are end result of consequences of some other processes but themselves are not processes.

Make a list of the theories put forward for the origin of life?

(a) Name the primates that lived about 15 million years ago. List their characteristic features.
(b) (i) Where was the first man-like animal found?
(ii) Write the order in which Neanderthals, Homo habilis and Homo erectus appeared on the earth. State the brain capacity of each one of them.
(iii) When did modern Homo sapiens appear on this planet?

One day, while returning home from school, Anil saw a crowd gathering front of Mr. Sharma's house. He asked his mother about it. She told that Mrs. Sharma gave birth to a child with small tail. Many people gathered just for curiosity and some whispered that it is a bad omen.
Read the above passage and answer the following questions:
(i) What is your opinion about child?
(ii) What is atavism?
(iii) What will be your role as a good citizen and student of biology?

(a) Write Hardy-Weinberg principle.
(b) Explain the three different ways the natural selection can affect the frequency of a heritable trait in a population shown in the graph given below.