EVOLUTION OF HORSE NEET


Evolution of horse


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Evolution of horse

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14.6 ECOLOGICAL SUCCESSION

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14.6 ECOLOGICAL SUCCESSION You have learnt in Chapter 13, the characteristics of population and community and also their response to environment and how such responses vary from an individual response.  Let us examine another aspect of community response to environment over time.  Bcological succession:   The gradual and fairly predictable change in the species composition of a given area is called ecological succession. An important characteristic of all communities is that composition and structure constantly change in response to the changing environmental conditions.  This change is orderly and sequential, parallel with the changes in the physical environment.  These changes lead finally to a community that is in near equilibrium with the environment and that is called a climax community.   Sere(s):  The entire sequence of communities that successively change in a given area are called sere(s).  The individual transitiona...
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Figure 7.9 A sketch of the evolution of plant forms through geological periods NEET

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Figure 7.9 A sketch of the evolution of plant forms through geological periods NEET Expectations/ practice 1. Match the following 2. Find the correct sequence Coenozoic    Quaternary Angiosperm (flowering plants) Monocotyledons Tertiary Bryophytes Measozoic    Cretaceous Shenopsids (horsetails), Ginkgos, Gnetales, Dicotes Jurassic Herbaceous lycopods, Ferns, Conifers and Cycads Triassic Paleozoic Permian Arborescent lycopods Carboniferous Seed ferns Devonian Progynmnosperm Silurian Zosterophyllum Chlorophyte ancestors > Tracheophyte ancestor > Rhynia-type Plants > Psilophyton Chlorophyte ancestor > Bryophytes Chlorophyte ancestors > Tracheophyte ancestor > Zosterophyllum > Arborescent lycopods > Herbaceous lycopods Chlorophyte > Tracheophyte > Rhynia-type Plants > Psilophyton > Shenopsids (horsetails) Chlorophyte > Tracheophyte > Rhynia-type Pla...
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16.2 WATER POLLUTION AND ITS CONTROL

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16.2 WATER POLLUTION AND ITS CONTROL  Human beings have been abusing the water-bodies around the world by disposing into them all kinds of waste.  We tend to believe that water can wash away everything not taking cognizance of the fact that the water bodies are our lifeline as well as that of all other living organisms.  Can you list what all we tend to try and wash away through our rivers and drains?  Due to such activities of human kind, the ponds, lakes, stream,rivers, estuaries and oceans are becoming polluted in several parts of the world.  Realising the importance of maintaining the cleanliness of the water bodies, the Government of India has passed the Water (Prevention and Control of Pollution) Act, 1974 to safeguard our water resources. 16.2.1 Domestic Sewage and Industrial Effluents: As we work with water in our homes in the cities and towns, we wash everything into drains.  Have you ever wondered where the sewage that comes out of o...
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