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प्रश्न
Define Speciation.
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उत्तर
The process of formation of a new species from the pre-existing species is called speciation.
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संबंधित प्रश्न
Struggle between cow and cow to get grass is called ______.
List three main factors responsible for the speciation and briefly describe each one of them
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
Which of the following represent tall plants and which represent short plants (or dwarf plants)?
(a) Tt
(b) tt
(c) TT
Give reason for your choice (The symbols have their usual meaning).
A plant has two varieties, one with red petals and the other with white petals. When these two varieties are cross-pollinated, all the offsprings have red petals?
(a) Which gene is dominant?
(b) Choose suitable letters to represent the two genes.
Name the scientist who gave the theory of evolution.
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
The theory of evolution of species by natural selection was given by ______
New species may be formed if:
- DNA undergoes significant changes in germ cells
- chromosome number changes in the gamete
- there is no change in the genetic material
- mating does not take place
Arrange the major events as per geological time scale:
(Origin of conifers, Abundance of trilobites, Diversification of fishes, All types of marine algae, Formation of Forests, Rise of dinosaurs, Extinction of seed ferns, Rise of modern insects.)
| Geological time period |
Major events | |
| 1. | Cambrian | ______ |
| 2. | Devonian | ______ |
| 3. | Permian | ______ |
| 4. | Triassic | ______ |
