IMPORTANT DOWNLOADS FOR CLASS XII

IMPORTANT DOWNLOADS FOR CLASS XII

REPRODUCTION AND DEVELOPMENT IN ANIMALS

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REPRODUCTION, GROWTH AND DEVELOPMENT

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 NOTES ON CHAPTER REPRODUCTIVE HEALTH

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CLASS IX HOLIDAY HOME WORK

CLASS IX HOLIODAY HOME WORK 2017-18

1. Carry out the following osmosis experiment:https://www.youtube.com/watch?v=8e-xNbk2bxw
Take four peeled potato halves and scoos each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.
Now,
(a) Keep cup A empty
(b) Put one teaspoon sugar in cup B
(c) Put one teaspoon salt in cup C
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following:
(i) Explain why water gathers in the hollowed portion of B and C.
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed out portions of A and D.
2. Collect your vaccination card. Photocopy it and learn about vaccines and immune system.
3. Collect different types of (5 each)
(a) pulses (1-10) (b) Cereals (11-20) (c) Oil seeds(21-30) (d) Medicinal Leaves(31-40)
4. Collect pictures of Different plant and animal species (20 pictures)
(a) Wild Animals (1-10) (b) Domestic Animals (11-20) (c) Flowering Plants (21-30 ) (d) Non flowering plants (31-40)
5. Draw colored and well labelled diagram of
(a) Plant cell (b) Animal Cell (c) a bacterial Cell