CBSE ADDA

Q1 Name the following: 1. Pigeon pea is a good source of................(protein) 2. Berseem is an important..................... (fodder) 3. ..................are rich in vitamins.(vegetable/fruits) 4. _________ Crops are grown in winters. (rabi) Q2 List some important traits in improved crops. Ans. Some of the important traits in improved crops are: 1. high yield                           2. improved quality       3. high resistance 4. wider adaptability             5. desirable agronomic traits Q3 Why is excess use of fertilizers detrimental for environment? Ans.Excess use of fertilizers has many bad effects like: 1. salination of soil     2. eutrophication   3. excess minerals in crop plants Q4 Give one word: 1. growing of wheat and groundnut in the same field .(mixed cropping) 2. xanthium and parthenium are called.(weeds) 3. causal organism of any disease is called.(pathogen) 4. Farming without the use of chemicals. (organic farming) 5. plan

LESSON---3 (METALS AND NON- METALS) LESSON –19 (POLLUTION OF AIR ) NOTE—Q.no.1 to 16 carry two marks each.Q.no.17 to 25 carry three marks each. Q.1. Differentiate between minerals and ores. Q.2. What are metalloids? Give some examples. Q.3. What do you mean by Reactivity and Reactivity Series. Q.4. What is a displacement reaction? Give an example. Q.5. What happens when Mg ribbon is put into CuSO4 soluition? Write the balanced chemical equation also. Q.6. Why is pure gold not suitable for making jewellery? Q.7. Why is iron metal known as the backbone of the industry ? Q.8. Why is Ag metal not used for making electrical wires? Q.9. Why is aluminium foil used to wrap food items? Q.10. Why are immersion rods for heating liquids are made up of metallic substances? Q.11. Write some common uses of Cu metal.

1. Name the person who first coined the term “Cell” Ans: Robert Hooke in 1665, first coined the term Cell. 2. Define Cell Ans: Cell is defined as the basic structural and functional unit of living organisms. 3. What will happen to a cell if its nucleus is removed? Ans: With the passage of time, the cell will die as the nucleus which controls and coordinates all the functions of the cell is absent. 4. Give 5 examples of single celled organisms. Ans: Paramecium, Amoeba, Chlamydomonas, Bacteria, Malarial Parasite 5. What are multicellular organisms ? Give an example. Ans: The organisms consisting of more than one (multiple) cells, where each cell performs a specialized function is known as Multicellular Organism. Example:- Animals, Plants, Fungi 6. The cell organelle which is commonly referred as the suicidal bags of the cell. Ans: Lysosomes. 7. Name the process through which an amoeba acquires its food from the external surroundings. Ans: The process

CBSE SOLVED TEST PAPERS CLASS - IX Science (Is matter around us pure)  Q. What is distillation? Ans: Distillation is a method of separating mixtures based on differences in their boiling points. The compound... read