India has more than 50,000 strains of rice. Mention the level of biodiversity it represents.

Mention the kind of biodiversity of more than a thousand varieties of mangoes in India represent. How is it possible .

A household supply of a.c. in India has a peak value of 311 V and a frequency of 50 Hz. Write the equation to represent the same.

For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?

Suppose that a radio tube insrted into a certain type of set has a probability0.2 of functioning more than 500 hours. If we test 4 tubes, what is the probability that exactly three of these function for more than 500 hours, .

A cooperative society of farmers has 50 hectare of land to grow two crops X and Y. The profit from crops X and Y per hectare are estimated as Rs 10,500 and Rs 9,000 respectively. To control weeds, a liquid herbicide has to be used for crops X and Y at rates of 20 litres and 10 litres per hectare. Further, no more than 800 litres of herbicide should be used in order to protect fish and wild life using a pond which collects drainage from this land. How much land should be allocated to each crop so as to maximise the total profit of the society?

Do you think Reproductive Health in our country has improved in the past 50 year ? if so, mention such areas of improvement.

Represent the following situations in the form of quadratic equations. The area of a rectangular plot is 528m^(2) . The length of the plot (in metres) is one more than twice its breadth. We need to find the length and breadth of the plot.