Name any four ecosystem services. Who gave the price tags on nature.s life support services? Which is the most important ecosystem service provider?

Biodiversity must be conserved as it plays an important role in many ecosystem services that nature provides. Explain any two services that nature provides .

Draw a rough sketch of a regular hexagon. Connecting any three of its vertices, draw a triangle. Identify the type of the triangle you havew drawn.

Mention any three ecosystem services to humans.

Three distinct points A, B and C are given in the 2 -dimensional coordinate plane such that the ratio of the distances of any one of them from the point (1,0) to the distance from the point(-1,0) is equal to (1)/(3) . The circumcentre of the trianglt A B C is at the point

Two long conductors separated by a distance d of carry currents I_2 and S_2 in the same direction. They exert a force f on each other. Now current in one of them is increased to two turns and its direction is reversed. The distance is also increased to 3d . The new value of the force between them is

(a) List any three observations which determine that a chemical reaction has taken place . Also list three informations that cannot be obtained about a chemical reaction, merely by its chemical equation. (b) Balance the following chemical equations. (i) Fe+H_(2)OrarrFe_(3)O_(4)+H_(2) (ii) CO_(2)+H_(2)O rarr C_(6)H_(12)O_(6)+O_(2)

A manufacturer considers that men and women workers are equally efficient and so he pays them at the same rate. He has 30 and 17 units of workers male and female and capital respectively, which he uses to produce two types of goods A and B. To produce one unit of A, 2 workers and 3 units of capital are required while 3 workers and 1 unit of capitals required to produce one unit of B. If A and Bare priced at 100 rupeya and 120 rupeya per unit respectively,how should he use his resources to maximize the total revenue ? Form the above as an LPP and solve it graphically .

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. "Plant hormones help to co - ordinate growth." Justify the statement by giving three examples.