science spot

Question: Why are some forests known as biodiversity hot spots? Answer: Forests where a large number of flora and fauna species are found are termed as 'biodiversity hot spots'. The range of different life forms like bacteria, fungi, ferns, flowering plants, nematodes..

The WBCs are involved in the production of antibodies that either neutralise, kill or poison the germs. The WBCs can be induced to produce antibodies with the help of vaccinations thus preparing the body for an attack. Inflammation at a spot is due to localised infection. The spot..

Question: The change in focal length of an eye lens to focus the image of objects at varying distances is done by the action of ________. 1. pupil 2. ciliary muscles 3. retina 4. blind spot Answer: ..

The number of times the heart beats per minute is called heart rate. For a normal adult human it is about 72 times per minute. For infants, it is a higher figure. It also goes up during physical exercise. The contractions and relaxations that the heart chambers undergo are felt all along the arter..

. Rainwater, which seeps into the ground and slowly percolates down through cracks in the upper crust, also gets heated by the hot rock beneath. In certain areas below the earth's surface, hot magma swells up into the crust, but remains trapped below the surface of the earth. Such areas in the eart..

Place a prism (P 1 ) on a table and a screen behind it. Allow a narrow beam of light to be incident on the prism (P 1 ). The white light gets dispersed and we obtain a band of seven colours on the screen. Now remove the screen and place another prism P 2 of the same material in the opposite d..

Forests and Wild Life - The biotic component of our environment on land, i.e. plants and animals (leaving aside the oceans and other water bodies) are overwhelmingly found in forests. Forests form a buffer for the earth to protect life forms; in fact that's where all our biodiversity and including ..

Question: Kiran Prakash recently saw the following illustration in the 'Junior Science'. The magazine invited comments from its readers. Since he is interested in UFOs, he decided to write a letter to them expressing his views. Using ideas from the unit 'Mystery' as well as your ..

Question 1 - Question: Kiran Prakash recently saw the following illustration in the 'Junior Science'. The magazine invited comments from its readers. Since he is interested in UFOs, he decided to write a letter to them expressing his views. Using ideas from the unit 'Mystery' as well as y..