In a given habitat we have 10 plant species and 15 animal species. Should we call this as 'diversity' or 'biodiversity'? Justify your answer.

In a given habitat we have 20 plant species and 20 animal species. Should we call this as 'diversity or biodiversity' ? Justify your answer.

What happens to the image distance in the normal human eye when we decrease the distance of an object, say 10 m to 1 m? Justify your answer.

(a) Indiscriminate human activities such as alien species invasion, fragmentation and habits loss have accelerated the lose of biodiversity. Justify by taking one example of each. (b) State the importance of (i) IUCN Red data list and (ii) Hot spots in conservation of biodiversity.

We are told that evolution is a continuing phenomenon for all living things. Are humans also evolving ? Justify your answer.

Can two numbers have 15 as their H.C.F. and 110 as their L.C.M.? Give reason to justify your answer.

Consider a closed loop C in a magnetic field, Fig. The flux passing through the loop is defined by choosing a surface whose edge coincides with the loop and using the formula phi = B_(1) .dA_(1) + B_(2). Da_(2) + ……..Now if we chose two different surfaces S_(1) and S_(2) having C as their edge, would we get the same answer for flux. Justify your answer.

Do different species of plant a growing in the same area show the same rate of tranpiration at a particular time ? Justify your answer.

(a) Give the evidence that the birds have evolved from reptiles. Insects, octopus, planaria and vertebrates posses eyes. Can we group these animals together on the basis of eyes that they possess? Justify your answer giving reason.

Identify true or false in the following statements : (i) Team biodiversity was popularised by Edward Wilson to describe the combined hetrogeneity at all levels of biological organisation. (ii) More than 5000 genetically different varieties of mango occur in India. (iii) Western Ghats have greater amphibian species diversity as compared to Eastern Ghats. We could lose all wealth of biodiversity in less than two decades if the present rates of species losses continue.

Why should the objective of a telescope have focal length and large apearture ? Justify your answer .