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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 factors could lead to the rise of a new species?
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? 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?
What do you understand by the term variation?
Select the group which shares the maximum number of common characters.
Name an animal having rudimentary eyes.
Name the ancestor of the following :
Broccoli, Kohlrabi, Kale
Name the famous book written by Charles Robert Darwin.
What is meant by a species?
Give two examples of plant species and two of animals.
State the various factors which could lead to the formation of new species.
The theory of evolution of species by natural selection was given by ______
One of the following has not been produced from wild cabbage by the process of artificial selection. This one is :
(a) kohlrabi
(b) cabbage
(c) spinach
(d) kale
Define speciation according to A.E. Emerson.
The process by which new species develop from the existing species is known as ______
The theory of evolution of species by natural selection was given by
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 |
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 | ______ |
