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प्रश्न
How are those species which are now 'extinct' studied?
उत्तर
The species that are extinct are studied through their fossils that are found by digging the earth. Carbon-dating method is used to find the age of a fossil.
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संबंधित प्रश्न
Explain the following:- Speciation
What is meant by speciation?
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be ______.
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.
What name is given to the sequence of gradual changes over millions of years in which new species are produced?
Choose the one term from the following which includes the other three :
broccoli, wild cabbage, cauliflower, cabbage
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
Very short answer question.
Define 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 | ______ |
