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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
What factors could lead to the rise of a new species?
List four factors responsible for speciation.
Name one reptile in given case where higher incubation temperature leads to the development of :male progeny.
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
Which of the following may be used to obtain an F2 generation?
(a) allowing flowers on a parent plant to be self-pollinated
(b) allowing flowers on an F1 plant to be self-pollinated
(c) cross-pollinating an F1 plant with a parent plant
(d) cross-pollinating two parent plants
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 famous book written by Charles Robert Darwin.
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.
What is meant by a species?
Give two examples of plant species and two of animals.
Define 'natural selection'.
The human species has genetic roots in ______
The theory of evolution of species by natural selection was given by ______
State and define three factors responsible for the rise of a new species.
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
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 | ______ |
