Mention three important features of fossils which help in the study of evolution.
What are homologous structures? Give an example.
Variations are the basis of heredity. Explain.
All the human races like africans, Asians, Europeans, Americans and other might have evolved from a common ancestor. Provide a few..
A man having blood group O (IOIO) marries a woman with blood group B (IBIO).
Assertion : Evolution is called as organic evolution
Reason : Evolution involves the living organisms
In pea plant, round seed is dominant over the wrinkled.
Traits that are acquired during lifetime do not result in evolution. Why?
Bacteria have a simpler body plan when compared with human beings.
(i) Give the evidence that the birds have evolved from reptiles.
(ii) Insects, Octopus, Planaria and vertebrates possess eyes.
Define evolution. How does it occur? Describe,
How do genes control the traits? Explain in detail.
A trait may be inherited, but may not be expressed. Justify this statement with the help of a suitable example.
Explain how the variations get accumulated.
X, Y and Z are three animals. The animal x can fly, but animal y can only run on ground or walls
Evolution is a/an
Assertion : Speciation is the development of one or more species from an existing species.
Reason : Classification is the arrangem..
Assertion : Dominant allele is an allele
Reason : It is represented by a capital letter
Assertion : Changes in non-reproductive
Reason : Inherited traits include the traits
Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.
Explain the original idea of tracing evolutionary relationships.
A scientist is conducting embryological studies for collecting evidence supporting evolution.
The genotype of the height of an organism is written as Tt. What conclusion may be drawn?
Assertion : The ratio of plants when Mendel took pea plants
Reason : The ratio of plants when Mendel took pea plant with one cont..
Assertion : The sex of the children will be
Reason : A human male has one x and one Y-chromosome
There is no real progress occuring in the concept of evolution. Explain.
Name any five vegetables generated from a common ancestor through artificial selection rather than natural selection.
The two areas of study namely evolution and Classification are interlinked. Justify the statement.
(i) How do we get an idea about the extinct
(ii) What are connecting links? Give one example
What is speciation? List four factors that could lead to speciation.
Give reason for your choice.
A person first crossed pure-bread pea plants having round-yellow seeds with pure-bread
A man with blood group A married a woman with blood group O and their daughter has blood group O.
Name two human traits which show variation.
Reproduction leads to variation. How?
Can sexual reproduction lead to the variations in characters, speciation and evolution? Explain
Assertion : All the female gemetes will have only X-chromosome
Reason : Females are homogametic with two X chromosomes.
(i) If, we cut the tail of a mouse, will tail occur in the next generation of that mouse
(ii) What are the features that Archaeopt..
(i) What is geographical isolation.
(ii) Illustrate formation of a species with the help of an example
(i) Identify the fossils A, B and C
(ii) In which region was fossil C found?
(iii) In which region are recent fossils found?
State one of the evolutionary forces leading to the origin of a new species according to the Darwins theory of evolution.
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