|
Name two homologous structures in vertebrates. Why are they so called?
|
|
0
|
2892
|
March 19, 2018
|
|
“It is possible that a trait is inherited but may not be expressed.” Give a suitable example to justify this statement
|
|
0
|
17563
|
March 19, 2018
|
|
Name the organism Mendel used for his experiments
|
|
0
|
4356
|
March 19, 2018
|
|
Describe the contribution of Lamarck
|
|
0
|
2311
|
March 19, 2018
|
|
Explain analogous organs and homologous organs
|
|
0
|
854
|
March 19, 2018
|
|
Mention three important features of fossils which help in the study of evolution.?
|
|
0
|
685
|
March 19, 2018
|
|
Planaria, insects, octopus and vertebrates all have eyes
|
|
0
|
1388
|
March 19, 2018
|
|
“Fossils are related to evolution”, justify this statement. Give the two ways by which age of the fossils can be estimated?
|
|
0
|
2947
|
March 19, 2018
|
|
. Explain the following:Speciation Natural Selection
|
|
0
|
1330
|
March 19, 2018
|
|
"Two areas of study namely ‘evolution’ and ‘classification’ are interlinked”. Justify this statement
|
|
0
|
9201
|
March 19, 2018
|
|
What are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained
|
|
0
|
17278
|
March 19, 2018
|
|
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
|
|
0
|
7680
|
March 19, 2018
|
|
List in tabular form, two distinguishing features between the acquired traits and the inherited traits with one example of each
|
|
0
|
3040
|
March 19, 2018
|
|
What is speciation? List four factors responsible for speciation
|
|
0
|
8083
|
March 19, 2018
|
|
Why is variation beneficial to the species but not necessary for the individual?
|
|
0
|
5346
|
March 19, 2018
|
|
How do variations occur in an offspring?
|
|
0
|
5113
|
March 19, 2018
|
|
‘Different species use different strategies to determine sex of a newborn individual
|
|
0
|
6331
|
March 19, 2018
|
|
“We cannot pass on to our progeny the experiences and qualifications earned during our life time”. Justify the statement giving reason and examples
|
|
0
|
9794
|
March 19, 2018
|
|
What is DNA copying? State its importance
|
|
0
|
20718
|
March 19, 2018
|
|
How many pairs of chromosomes are present in human beings?
|
|
0
|
969
|
March 19, 2018
|
|
List two differences in tabular form between dominant trait and recessive traits
|
|
0
|
7427
|
March 19, 2018
|
|
A change in DNA that is useful for one property to start with, can become useful later for a different function. Explain
|
|
0
|
3528
|
March 19, 2018
|
|
All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor
|
|
0
|
668
|
March 19, 2018
|
|
Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution
|
|
0
|
569
|
March 19, 2018
|
|
A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation.?
|
|
0
|
551
|
March 19, 2018
|
|
How does use and disuse of an organ help in evolution of a new species?
|
|
0
|
1317
|
March 19, 2018
|
|
Do genetic combination of mothers play a significant role in determining the sex of a new born?
|
|
0
|
636
|
March 19, 2018
|
|
What is the contribution of Mendel to genetics?
|
|
0
|
615
|
March 19, 2018
|
|
Give the pair of contrasting traits of the following characters in pea plant and mention which is dominant and recessive
|
|
0
|
672
|
March 19, 2018
|
|
What are the causes of variations?
|
|
0
|
579
|
March 19, 2018
|