While a biology student goes to the beach, he happens to see crabs and starfishes on the sea shore.

In Class XI of a school 40 % of the students study Mathematies and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathemetics or Biology.

When a person goes deep into the sea, he/she develops complications due to

A swimmer S is in the sea at a distance dk m from the closest point A on a straight shore. The house of the swimmer is on the shore at distance Lk m from A. He can swim at speed of ukm/h. walk at speed at vkm/h. At what point on shore should he land so that hhe reaches his house in the shortest time.

In a biology period, the teacher drew the heart of rabbit on the board and explained its structure and functions. After the class, your friend told you that he finds it difficult to understand the concept and felt he wanted a detailed explanation. Do you think using technologies like Visual Communication help students to understand the difficult concepts in a simple way?

Read the paragraph and answer the following question: You must be knowing about the high and low tides that occur regularly in the sea. The level of the sea water at any given location along sea shore increases and decreases twice a day at regular intervals. High and low tides occur at different times at places. The level of water in sea changes because of the gravitational force exerted by the moon. Water directly under the moon gets pulled towards the moon and the level of water there goes up causing high tide at that place. At two places on the earth at 90^(@) from the place of high tide, the level of water is minimum and low tides occur there. How does sea level changed?

Read the paragraph and answer the following question: You must be knowing about the high and low tides that occur regularly in the sea. The level of the sea water at any given location along sea shore increases and decreases twice a day at regular intervals. High and low tides occur at different times at places. The level of water in sea changes because of the gravitational force exerted by the moon. Water directly under the moon gets pulled towards the moon and the level of water there goes up causing high tide at that place. At two places on the earth at 90^(@) from the place of high tide, the level of water is minimum and low tides occur there. Where is high tide and low tide caused?

Read the paragraph and answer the following question: You must be knowing about the high and low tides that occur regularly in the sea. The level of the sea water at any given location along sea shore increase and decreases twice a day at regular intervals. High and low tides occur at different times at places. The level of water in sea changes because of the gravitational force exerted by the moon. Water directly under the moon gets pulled towards the moon and the level of water there goes up causing high tide at that place. At two places on the earth at 90^(@) from the place of high tide, the level of water is minimum and low tides occur there. How many times the sea level at the coast change?