Give one word for fishes like cyclostomes which migrate for spawning to fresh water from their marine habitat.

Give reasons : A ship dips to a larger depth in fresh water as compared to marine water .

You have heard about several insectivorous plants that feed on insects. Nepenthes or the pitcher plant is one-such example, which usually grows in shallow water or in marsh lands. What part of the plant is modified into-a 'pitcher'? How does this modification’help.the plant for food even though it can, photosynthesize like any Other green plant?

If a marine fish is placed in a fresh water aquarium, will it be able to survive?

A ray of light travels from air to water to glass and again from glass to air. Refractive index of water with respect to air is ‘x’ glass with respect to water is ‘y’ and air with respect to glass is ‘z which one of the following is correct?

Answer the following questions: A tapping vessel opens in a tank like container that is tapering on the lower side .The tank has an outlet for water on the upper side a water inlet on the lower side. Finely ground ore is released in the tank. A forceful jet of water is introduced in the tank from lower side and gangue particles and pure ore are separated by this method. The above description is of which gravitation separation method ?

Give examples of an anJMDl and plant that can survive in fresh water as well as marine water.

1. Fiil in the blanks by selecting the correct word from the bracket and complete the paragraph. (collar, roundworms, marine, proboscis, acorn Worms, Urochordates, terrestrial, Herdmania, Balanoglossus, Doliolum, Saccoglossus) Body of Hemichordates is divided into proboscis, ________ and trunk, Notochord is present in the _______ region only. These animals are also known as _____. They are found in ________ habitat. _______ and ________ are the members of this phylum.

A ray of light travels from water to glass. Which one of the following statements is true ?

A U-tube with both ends open to the atmosphere is partially filled with water. Oil, which is immiscible with water. Is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65mm from its original level (see diagram). The density of the oil is: