Uncategorized

Name the following :   1.  CH3－CH2－COO－CH3 2. 3. 4.                5. 6. 7.                                 8. 9.                          10. 11. 12. 13.   […]

1. What is the difference between +R and – R effects?   2. Draw the resonance structure of the following  and also mention the type of R effect: 1.  CH2 = CH－Cl 2. CH3－CH  = CH－CHO 3. CH3－CH  = CH－CH2 + 4.  5.   6.  7.                              8. 

    Name the following :     1. COOH－COOH 2. CHO－CHO 3. CHO－CH2 －CHO 4. CHO－CH2－CH2－CH2－CH2－COOH 5. COOH－CH2  －COOH 6. CHO－CH2－CH2－CH2－CH2－OH 7.  8.   9.   10.   11.      12.      

DPP – 10S71 How Do Organisms Reproduce?     1. Which of the following is an example of asexual reproduction? a) Binary fission in amoeba b) Pollination in flowers c) Fertilization in humans d) Seed formation in plants     2. Why is reproduction not considered a definite characteristic of living organisms? a) Because all

DPP -9S12 STATE CHANGE & EVAPORATION 1. Aquatic animals use oxygen dissolved in water during respiration. Explain. 2. Sponge is a solid yet we are able to compress it. Why? 3. Describe the compressibility in Gases with example. 4. When a solid melts, its temperature remains the same, so where does the heat energy goes?

DPP -11B13 The Living World     1.Define a Taxon. What is meant by Taxonomical Hierarchy ? Give the flow diagram from the lowest to highest category for a plant and an animal.     2.What is Biodiversity?     3.Tiger and Lion belong to the same Genus but different species. What saparates the two

DPP -10S52 Life Process   1. State the location and function of gastric glands.   2. Answer the following questions:-    Why is nutrition necessary for the human body?  What causes movement of food inside the alimentary canal?  Why is small intestine in herbivores longer than in carnivore? What will happen if mucus is not

DPP -9S52 CELL : The fundamental unit of life 1. What is the main function of the plasma membrane in a cell? 2. What is the nucleus, and why is it important for the cell? 3. What is the cytoplasm, and what is it’s function in the cell? 4. Name four differences between plant and

DPP-10S91  REFLECTION RAY DIAGRAM & NUMERICALS   1. An object, 2 cm in size, is placed at 25.0 cm in front of a concave mirror and is of focal length 10 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and size

DPP-10S13 DECOMPOSITION REACTION     1. Why is the amount of gas collected in one of the test tubes in the Electrolysis of water is double of the amount collected in the other? Name this gas. 2. Why are decomposition reactions called the opposite of combination reactions? Write equations to explain. (CBSE 2012) 3. 2g