Short Answer TypeWhy are forest considered biodiversity hot spots? List two ways in which an individual can contribute effectively to the management of forests and wildlife.
Forests are considered biodiversity hot spots because they have very high level of species richness and a high degree of endemism.
A person can effectively contribute towards the management of forests and wildlife by:
i) Using fewer products which are derived directly from forests and wildlife such as wood, animal skin etc.
ii) Avoid discriminate cutting down of forest for the industrial purpose.
What is meant by 'sustainable management'? Why is reuse considered better than recycling?
With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.
What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.
How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move:
(a) Down a group and
(b) From left to right in a period
From the following elements:
4Be; 9F; 19K; 20Ca
(i) Select the element having one electron is the outermost shell.
(ii) two elements of the same group.
Write the formula and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).
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