By 2025, two thirds of the world's Popuulation may face water shortages.

Assertion: By 2025, at least 90% of worlds population are projected to face water scarcity. Reason: By 2025, 70% of forest cover will be destroyed.

Name any two fresh water algae.

Write the two step involved in absoprtion of water by plants.

Mention two aims of sustainable world.

A lens is made with 2 convex faces of same radii of curvature. The refractive index of the lens material is 1.54. What will be the radii of the two convex faces in order to give the lens a focal length of 30 cm ?

There are two die A and B both having six faces. Die A has three faces marked with 1, two faces marked with 2, and one face marked with 1, two faces marked with 2, and one face marked with 3. Die B has one face marked with 1, two faces marked with 2, and three faces marked with 3. Both dices are thrown randomly once. If E be the event of getting sum of the numbers appearing on top faces equal to x and let P(E) be the probability of event E, then When x = 4, then P(E) is equal to

There are two die A and B both having six faces. Die A has three faces marked with 1 , two faces marked with 2 , and one face marked with 3 . Die B has one face marked with 1 , two faces marked with 2 , and three faces marked with 3 . Both dices are thrown randomly once. If E be the event of getting sum of the numbers appearing on top faces equal to x and let P(E) be the probability of event E , then P(E) is maximum when x equal to

A six sided die is marked '2' on one face, '3' on two of its faces, and '4' on remaining three faces. The die is thrown twice. If X denotes the total score in two throws, find the values of the random variable and number of points in its inverse images.

Two dice are rolled simultaneously. Find the probability that the sum of the numbers on the faces is neither divisible by 3 nor by 4.