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प्रश्न
What is species and speciation?
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उत्तर
- Species is a group of organisms that can produce fertile individuals through natural reproduction.
- Speciation is the formation of new species of plants and animals as an effect of evolution.
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संबंधित प्रश्न
List three main factors responsible for the speciation and briefly describe each one of them
What is meant by speciation?
Name one reptile in given case where higher incubation temperature leads to the development of :male progeny.
Name two human traits which show variation.
How does the creation of variation in a species ensure its survival
Select the group which shares the maximum number of common characters.
Name five varieties of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.
With the help of an example, explain how variation leads to evolution.
State the various factors which could lead to the formation of new species.
Does geographical isolation of individuals of a species lead to the formation of a new species? Provide a suitable explanation for your answer.
Which of the following statement is incorrect with respect to variations?
(a) all variations in a species have equal chance of survival
(b) change in genetic composition results in variations
(c) selection of variations by environmental factors forms the basis of evolutionary process
(d) variations are the minimum in asexual reproduction
According to the evolutionary theory, the formation of a new species is generally due to ______
List any two factors that could lead to speciation.
The process by which new species develop from the existing species is known as ______
In human males, all the chromosomes are paired perfectly except one. These unpaired chromosomes are ______
(i) Large chromosome
(ii) Small chromosome
(iii) Y chromosome
(iv) X chromosome
Add a note on allopatric speciation.
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 | ______ |
