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प्रश्न
What is species and speciation?
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
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? 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?
List four factors that could lead to speciation. Which of them cannot be a major factor in the speciation of a self-pollinating plant species?. Give reason to justify your answer.
How does the creation of variation in a species ensure its survival
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
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.
Name an animal having rudimentary eyes.
Name the ancestor of the following :
Broccoli, Kohlrabi, Kale
Choose the one term from the following which includes the other three :
broccoli, wild cabbage, cauliflower, cabbage
Give two examples of plant species and two of animals.
Define 'natural selection'.
Very short answer question.
Define Speciation.
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Speciation is the reproductive isolation amongst once interbreeding population.
Reason: Genetic drift, Natural selection, and Severe DNA change can cause speciation.
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
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 |
