Lakhmir Singh solutions for बायोलॉजी [अंग्रेजी] कक्षा १० आईसीएसई chapter 15 - Human Evolution [Latest edition]

True or False.

Wisdom tooth is an example of analogous organs.

True or False.

Archaeopteryx is a connecting link between the reptiles and the birds.

To know how old any fossil is, ______ and ______ methods are used.

The structures which are functionally similar but structurally different are called ______.

The use and disuse of organs was proposed by ______.

Forearm of human, forelimb of horse and wings of bat are examples of ______.

Analogous organs arise due to ______.

Which is not a vestigial organ in man?

After the death of two insects, one of the insects was buried in hot mud and the other in usually found mud. Which of the two is more likely to be preserved better and why?

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

True or False.

The mutation theory of evolution was proposed by Lamarck.

True or False.

Darwin proposed the theory of natural selection.

The process by which new species develop from the existing species is known as ______.

Variation amongst species population occur due to ______ which is the raw material of evolution.

Darwin's theory of evolution failed to talk about ______.

During industrial revolution, the black soot on the tree bark hid the ______.

Fossils are generally found in ______.

Which of the following are the two key concepts of Darwinian theory of evolution?

True or False.

The common ancestor to both man and ape is Dryopithecus.

True or False.

The remains of Homo sapiens, were first discovered in Europe and were named Australopithecus.

True or False.

All the ancestors of human evolution came first from Africa.

The name Homo sapiens was given by ______ to human beings.

The stage of human evolution which showed obligate bipedalism.

The brain capacity of Homo erectus was about ______.

Which of the following statements is correct?

Which of the following statement is correct regarding evolution of mankind?

True or False.

Evolution is considered to be a unifying principle of biology since it explains both the unity and diversity of life.

True or False.

According to Darwin, selective breeding is most responsible for evolution.

True or False.

Body parts found in different species that are structurally similar are said to be analogous structures.

True or False.

Genetics is a process of biological changes in a species over time.

True or False.

A phenotype that allows an organism to survive and reproduce is a(n) vestigial structure.

True or False.

Biodiversity is the variety of different life forms within an area.

True or False.

Organisms that are related but have evolved to become different over time have a similar habitat.

Body parts found in different species that serve a similar function are said to be ______ structures.

______ can be described as the survival of the biggest and the strongest.

A ______ is a group of similar organisms that can breed and produce fertile offspring.

Charles Darwin wrote ______.

The brain size of Neanderthals was ______.

Match the following.

Give One Word Answer:

Study of fossils.

Give One Word Answer:

Organs which are similar in structure and origin but perform different functions.

Give One Word Answer:

Imperfectly developed (non-functional) organs found in the body.

Give One Word Answer:

Scientist who proposed the theory of inheritance of acquired characters.

Give One Word Answer:

Primate or extinct ape, deemed to be the ancestors of both man and apes.

The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because ______.

The theory of Natural Selection was given by ______.

Replacement of the lighter-coloured variety of peppered moth to its darker variety in England is the example of ______.

The theory of spontaneous generation stated that ______.

The extinct stone ancestor, who ate only fruits and hunted with stone weapons was ______.

One of the oldest, best preserved and most complete hominid fossils commonly known as 'Lucy' belongs to the genus

Which one of the following phenomena supports Darwin's concept of Natural Selection in organic evolution?

Which one is not a vestigial organ?

By the statement 'survival of the fittest', Darwin meant that

According to Lamarckism, long-necked giraffes evolved because ______.

Genetic drift operates only in ______.

The factors involved in the formation of new species are ______.

The extinct human who lived 1,00,000 to 40,000 years ago, in East and Central Asia, used hides to protect their bodies and had brain capacity of 1400 cm³ were:

Arrange and rewrite the terms in group in correct order to be in a logical sequence, beginning with the term that is underlined:

Australopithecus, Cro-Magnon, Homserectus, Neanderthal man, Homs sapiens

When did human evolution begin?

What function did wisdom tooth perform?

With which group of animals do humans share their immediate ancestors?

Define the following term:

Evolution

Define the following term:

Variations

Define gene pool.

 Define the term of species.

Define the following term:

Vestigial organs

How does natural selection help in evolution? Give an example.

Differentiate between the Following:

Evolution and Variation

Write down the difference between homologous and analogous organs.

Differentiate between Lamarck's Theory and Darwin's Theory.

Differentiate between the Following:

Natural selection and Adaptation

Differentiate between divergent evolution and convergent evolution with one example for each.

What are the two major contributions of Charles Darwin regarding evolution? Describe briefly.

Explain the most valid theory about the origin of life on earth.

How does Darwin's theory of Natural Selection explain new forms of life on earth?

What are the characteristics that have developed in human beings during evolution?

Explain with an example for the given, how the following provides evidence in favor of evolution in organisms:

Homologous organs

Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :

Analogous organs

Explain vestigeal organs as evidence of evolution.

Look at the figures and answer the following questions:

1. Identify and write the names of the evolving stages of human.
2. Write two features of each stage.
3. Write the complete classification of human (Kingdom to Species).
4. State the common features between apes and humans.

Given below are two stages in the evolution of man. Study them and answer the question that follow.

1. Identify Australopithecus and Neanderthal man from the pictures.
2. Mention two characteristic features each for the two stages.
3. Who proposed the theory of 'Natural Selection'?
4. Give two examples of vestigial organs in human.

Use the Internet to trace the evolutionary stages of any one animal, e.g., panther. Discuss your research with your teacher and classmates.

Make a chart as in 'concept map' given in this chapter and stick it in you class bulletin board. Use colourful chart papers and glitter pens to make the chart attractive.

Complete the table below to make a detailed chart on the different stages of human.

ACROSS

1. Process how a new kind of plant or animal species is created
2. Dying out of a species
3. Structures which are functionally similar but structurally different
4. The era which started 66 million years ago
5. First human-like ancestor
6. Any small degenerated or imperfectly developed organ
7. Gave Theory of Inheritance of Acquired Characters
8. Study of fossils

DOWN

1. Extinct carnivorous or herbivorous reptiles
2. Clade of Old-World simians native to sub-Saharan Africa and Southeast Asia
3. An ancient flying reptile which lived on the earth
4. Process by which different living organisms are believed to have developed from earlier forms
5. Gave Theory of Natural Selection
6. Vestigial part of ear that pick-up sound waves
7. Remains or impression of a prehistoric plant or animal embedded and preserved in rock
8. Combination of all the genes present in a species
9. Fossil bird with reptilian features