The organic remnants of the past life forms preserved on the sedimentary rocks in the earth is called fossils. They are the best and direct evidences of organic evolution. The age of fossils is calculated by radio-carbon dating and many other methods, which tells us about the era when the life form were alive. Fossils are of many types, like: Actual remains like the cryopreserved Woolly mammoth (of Siberia) or insects preserved in amber. Petrified plants and animals. Skeletal elements like bones, teeth, etc. of an animal. Moulds are the hardened encasements formed in the outer parts of organic remains which later decayed leaving cavities. Casts are hardened pieces of mineral matter deposited in the cavities of moulds.

MEDIUM

Earn 100

In a forest, there are two types of deers, in which one type can run very fast. Whereas the second type of deer cannot run as fast as the first one. Lions, tigers hunt deers for their food. Imagine what type of deers are going to survive in the forest and which type of deers population is going to be eliminated? And why?

Important Questions on Heredity and Evolution

EASY

Science>Biology>Heredity and Evolution>Evolution

Which one of the following is the intraspecific struggle for the same food?

HARD

Science>Biology>Heredity and Evolution>Evolution

Natural selection means

HARD

Science>Biology>Heredity and Evolution>Evolution

What are the different ways in which individuals with a particular trait may increase in a population?

EASY

Science>Biology>Heredity and Evolution>Evolution

Industrial melanism is an example of:

MEDIUM

Science>Biology>Heredity and Evolution>Evolution

Give the salient features of the theory of Natural Selection proposed by Charles Darwin.

EASY

Science>Biology>Heredity and Evolution>Evolution

Identify which of the following indicates inter-specific struggle -

HARD

Science>Biology>Heredity and Evolution>Evolution

Enumerate (in any six points) the basis of Darwin theory of natural selection.

MEDIUM

Science>Biology>Heredity and Evolution>Evolution

Expressed sequence tags (ESTs) refers to:

EASY

Science>Biology>Heredity and Evolution>Evolution

What is fossil?

EASY

Science>Biology>Heredity and Evolution>Evolution

An epidemic of milk-borne gastroenteritis caused by Salmonella was reported in an Indian city in

1985

. Faecal samples from suspected individuals were inoculated into Selenite broth (high Selenium concentration) and incubated. After a thorough investigation, it was found that only Salmonella, and not the common gut bacterium Escherichia coli could grow in this medium. The basis of growth of Salmonella in Selenite broth is

EASY

Science>Biology>Heredity and Evolution>Evolution

A good number of Tilapia fishes are released in a pond having only different indigenous fish species grown naturally. Think and write which types of the struggle for existence Tilapia fishes have to face in order to survive?

MEDIUM

Science>Biology>Heredity and Evolution>Evolution

Which one of the following factors is not included in the 'Modern Synthetic theory' of evolution?

EASY

Science>Biology>Heredity and Evolution>Evolution

Which of the following structures is homologous to the wing of a bird?

MEDIUM

Science>Biology>Heredity and Evolution>Evolution

Parthenium is an exotic species in our country, Other indigenous species cannot survive in such places where it grows. This establishes one of the postulates of Darwin's theory. Identify the postulate

EASY

Science>Biology>Heredity and Evolution>Evolution

Which of the following had the smallest brain capacity?

MEDIUM

Science>Biology>Heredity and Evolution>Evolution

Convergent evolution is illustrated by ___.

EASY

Science>Biology>Heredity and Evolution>Evolution

Which one of the following are analogous structures?

MEDIUM

Science>Biology>Heredity and Evolution>Evolution

Describe the facts on which Darwin's theory is based.