P-2 Animal Classification — Science STD 10 — Question

Complete the chart - Classification of living organisms

Write short notes: Homologous series.

The solid element A exhibits the property of catenation. It is also present in the form of a gas B in the air which is utilised by plants in photosynthesis. An allotrope C of this element is used in glass cutters.

1. What is element A?
2. What is the gas B?
3. Name the allotrope C.
4. State another use of allotrope C (other than in glass cutters).
5. Name another allotrope of element A which exists as spherical molecules.
6. Name a yet another allotrope of element A which conduct electricity.

Write short notes on: Magnetic separation method

 A calorimeter has mass 100 g and specific heat 0.1 kcal/kg ·°C. It contains 250 g of liquid at 30 °C having specific heat of 0.4 kcal/kg·°C. If we drop a piece of ice of mass 10 g at 0 °C into the liquid, what will be the temperature of the mixture?

When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are:

1. Elements.
2. Compounds.
3. Reactants.
4. Products.
5. Metals.
6. Non-metals.

1 Dietary fibre — found mainly in fruits, vegetables, whole grains and legumes — is probably best known for its ability to prevent or relieve constipation. But foods containing fibre can provide other health benefits as well, such as helping to maintain a healthy weight and lowering your risk of diabetes, heart disease and some types of cancer. Dietary fibre, also known as roughage or bulk, includes the parts of plant foods your body can’t digest or absorb. Unlike other food components, such as fats, proteins or carbohydrates — which your body breaks down and absorbs — fibre isn’t digested by your body. Instead, it passes relatively intact through your stomach, small intestine and colon and out of your body.
Questions and Answers :
(1) Which food items provide rich fibre content?
(2) Enlist the advantages of fibres in diet.
(3) Are fibres digested in the body?
(4) Which is the path through which fibres pass in the digestive tract?
(5) What is a roughage?

Some sugar solution is taken in a test-tube and a little of substance X in powder form is added to it. The mouth of test - tube is closed with a cork and allowed to stand for sometime. On opening the cork, a characteristic smell of substance Y is obtained and a gas Z is also observed to be formed. The gas Z extinguishes a burning matchstick.

1. What could be X, Y and Z?
2. What is the process of converting sugar into substance Y by the action of X known as?
3. What type of respiration is exhibited by X in the above process?

Read the following paragraphs and write the answers.
Next to the moon, the astronomical object nearest to the earth is Mars. Many nations sent spacecrafts to Mars. Mars mission is difficult and almost half the missions were unsuccessful. However, ISRO’s performance in this mission is remarkable and we all must be proud of it. The spacecraft ‘Mangalyaan’ made by ISRO using minimum expenses was launched in November, 2013 and was placed into orbit around Mars in September, 2014. It obtained very useful information about the surface of Mars and the atmosphere around it.

1. Next to the moon, which is the nearest celestial object to the earth?
2. When did Mangalyaan placed into orbit around Mars by ISRO?
3. What important information did ISRO's Mangalyaan obtain?
4. Explain that critical velocity does not depend on the mass of the satellite.