CBSE Class 10


Explain with reason why giraffe has long neck [Class 10 Science] (1)
Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation [Class 10 Science] (1)
List three factors that provide evidences in favour of evolution in organisms and state the role of each in brief [Class 10 Science] (1)
In a cross between plants with pink flowers and plants with white flowers [Class 10 Science] (1)
Name two homologous structures in vertebrates. Why are they so called? [Class 10 Science] (1)
“It is possible that a trait is inherited but may not be expressed.” Give a suitable example to justify this statement [Class 10 Science] (1)
Name the organism Mendel used for his experiments [Class 10 Science] (1)
Describe the contribution of Lamarck [Class 10 Science] (1)
Explain analogous organs and homologous organs [Class 10 Science] (1)
Mention three important features of fossils which help in the study of evolution.? [Class 10 Science] (1)
Planaria, insects, octopus and vertebrates all have eyes [Class 10 Science] (1)
“Fossils are related to evolution”, justify this statement. Give the two ways by which age of the fossils can be estimated? [Class 10 Science] (1)
. Explain the following:Speciation Natural Selection [Class 10 Science] (1)
A pea plant with blue colour flower denoted by BB is cross-bred with a pea plant with white flower denoted by ww [Class 10 Science] (1)
"Two areas of study namely ‘evolution’ and ‘classification’ are interlinked”. Justify this statement [Class 10 Science] (1)
What are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained [Class 10 Science] (1)
In one of his experiments with pea plants Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant, in the first generation [Class 10 Science] (1)
List in tabular form, two distinguishing features between the acquired traits and the inherited traits with one example of each [Class 10 Science] (1)
What is speciation? List four factors responsible for speciation [Class 10 Science] (1)
Why is variation beneficial to the species but not necessary for the individual? [Class 10 Science] (1)
How do variations occur in an offspring? [Class 10 Science] (1)
‘Different species use different strategies to determine sex of a newborn individual [Class 10 Science] (1)
“We cannot pass on to our progeny the experiences and qualifications earned during our life time”. Justify the statement giving reason and examples [Class 10 Science] (1)
What is DNA copying? State its importance [Class 10 Science] (1)
How many pairs of chromosomes are present in human beings? [Class 10 Science] (1)
List two differences in tabular form between dominant trait and recessive traits [Class 10 Science] (1)
A change in DNA that is useful for one property to start with, can become useful later for a different function. Explain [Class 10 Science] (1)
All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor [Class 10 Science] (1)
Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution [Class 10 Science] (1)
A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation.? [Class 10 Science] (1)