Will Geographical Isolation Be a Major Factor in the Speciation of a Self-pollinating Plant Species? Why Or Why Not? - Science


Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?



Geographical isolation can prevent the transfer of pollens among different plants. However, since the plants are self-pollinating, which means that the pollens are transferred from the anther of one flower to the stigma of the same flower or of another flower of the same plant, geographical isolation cannot prevent speciation in this case.

Concept: Speciation
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Chapter 9: Heredity and Evolution - Intext Questions [Page 151]


NCERT Science Class 10
Chapter 9 Heredity and Evolution
Intext Questions | Q 2 | Page 151

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Struggle between cow and cow to get grass is called ______.

The palisade cells of a species of plant contain 28 chromosomes. How many chromosomes will there be in each gamete produced by the plant?
(a) 56
(b) 28
(c) 14
(d) 4

Why are human beings who look so different from each other in terms of size, colour and looks said to belong to same species?

 Name five varieties of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.


Choose the one term from the following which includes the other three :
broccoli, wild cabbage, cauliflower, cabbage

With the help of an example, explain how variation leads to evolution.

What is meant by a species? 

Define 'speciation'. Explain how speciation occurs.

Define 'natural selection'.

According to the evolutionary theory, the formation of a new species is generally due to ______

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

Read the following statement and justify same in your own words with the help of suitable example.

Geographical and reproductive isolation of organisms gradually leads to speciation.

Very short answer question.

Define Speciation.

What is species and speciation?

Define speciation according to A.E. Emerson and explain its types giving suitable examples.

Cichlid fishes in Lake Victoria are representatives of ______ type of speciation.

Add a note on allopatric speciation.

Add a note on sympatric speciation.

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
Major events
1. Cambrian ______
2. Devonian ______
3. Permian ______
4. Triassic ______


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