Short Answer TypeList four advantages of properly managed watershed management.
The four advantages of properly managed watershed management are:
i. It increases the production and income of watershed community.
ii. It helps to mitigate droughts and flood.
iii. It helps to develop primary resources of land and water.
iv. It helps to produce secondary resources of plants and animals for use in a manner which will not cause ecological imbalance.
Explain giving example where active involvement of local people lead to efficient managemnent of forests.
How do organisms, whether reproduced asexually or sexually maintain a constant chromosome number through several generations? Explain with the help of suitable example.
Name the parts A, B and C shown in the following diagram and state one function of each.
Suggest three contraceptive methods to control the size of human population, which is essential for the health and prosperity of a country. State the basic principle involved in each.
List three distinguish features, in tabular form, between acquired traits and inherited traits.
Give reasons to justify the following:
(a) The existence of decomposers is essential in a biosphere.
(b) Flow of energy in a food chain is unidirectional.
What do you observe when you drop a few drops of acetic to test tubes containing
(a) phenolphthalein
(b) distilled water
(c) universal indicator
(d) sodium hydrogen carbonate powder
Draw a labelled diagram to show that particular stage of binary fission in amoeba in which the nucleus elongates and divides into two and a constriction appears in its cell membrane
Switch
