CBSE Class 10   Class 10 Science

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