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प्रश्न
With the help of an example, explain how variation leads to evolution.
उत्तर
Variations which are beneficial to the organism is passed on to its progeny, leading to evolution of species. For example, the green colour of a beetle is an inherited trait, that helps in its survival (as it can by mix with green bushes to hide). It is a beneficial variation and is brought about by a change in the genes of the reproductive cells.
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संबंधित प्रश्न
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?
"Natural selection and speciation leads to evolution." Justify this statement.
A plant with two 'small' genes breeds with a plant with two 'tall' genes to produce :
(a) small plants and tall plants in the ratio 1 : 3
(b) all small plants
(c) all tall plants
(d) tall plants and small plants in the ratio 3 : 1
The palisade cells of a species of plant contain 28 chromosomes. How many chromosomes will there be in each gamete produced by the plant?
(a) 56
(b) 28
(c) 14
(d) 4
Name the scientist who gave the theory of evolution.
Name the ancestor of the following :
Broccoli, Kohlrabi, Kale
Name five varieties of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.
Fill in the following blank with suitable word:
Broccoli has evolved from .............. by the process of artificial selection.
Complete the following chart:
| Animals | Connecting link between | |
| (1) | Balanoglossus | ______ |
| (2) | ______ | Annelida and Arthropoda |
| (3) | Lung fishes | ______ |
| (4) | ______ | Reptiles and mammals |
| (5) | Seymouria | ______ |
| (6) | Fishes and Amphibia |
