NCERT Extended Learning Activities And Projects<\/span><\/p>\nQuestion 1.
\nBecome a leaf expert: Do this activity with a number of leaves over a period of few weeks. For every leaf that you wish to study, pluck it and wrap it in a wet cloth and take it home. Now, place the leaf between the folds of a newspaper and place a heavy book on it. You can also put it under your mattress or a trunk! Take out the leaf after a week. Paste it on a paper and write a poem or story about it. With your leaf collection pasted in a book, you can become an expert about leaves!
\nAnswer:
\nDo it yourself.<\/p>\n
Question 2.
\nNames of plant parts are hidden in this grid. Search them by going up, down, diagonally, forward or backward. Have fun!
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\nAnswer:
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Activity 1<\/span><\/p>\nObjective: To show that water travels up through the stem of a plant.
\nMaterials Required: Two glasses, red ink, freshly cut branches of a plant preferably bearing white flowers and blade.
\nProcedure:<\/p>\n
\n- Take two glasses with little water in them. Label these glasses as A and B.<\/li>\n
- Cut the lower end of the branches obliquely (or at an angle) with the help of a blade.<\/li>\n
- Put one branch in each of the glasses. Add a few drops of red-ink into the water in glass A and shake it to mix the ink.<\/li>\n<\/ul>\n
\nLeave the set up as such overnight. Observe the branches from inside and the flowers if the branches had flowers.
\nObservations: The branch from inside and the flower on it in glass A appears red. The colour of the branch and the flower in glass B remains unchanged.
\nConclusion: Water travels up the stem through narrow tubes in it.<\/p>\n
Leaf: It is the green part of the plant that prepares food. A leaf has following parts:
\ni. Lamina: Lamina is the broad, green part of the leaf.
\nii. Petiole: Petiole is the thin stalk with which leaf is attached to the stem or branch.
\niii. Midrib: It is the prominent line in the middle of the leaf blade.
\niv. Veins: The various small, lateral lines arising from midrib and spread in lamina are called veins.
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Venation: Venation is the arrangement of veins in the lamina. All the leaves contain veins. The arrangement of veins in the leaves of various plants is different. It can be of two types:
\ni. Reticulate venation: If veins make a net-like design on both sides of midrib, it is called reticulate venation. E.g., mango leaf, peepal leaf, etc.
\nii. Parallel venation: If the veins are arranged parallel to each other and to the midrib, it is called parallel venation. E.g., grasses.
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\n- Transpiration: Transpiration is the process by which water comes out from the leaves in the form of vapour. It helps the plant in cooling and absorbing nutrients from the root.<\/li>\n<\/ul>\n
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Activity 2<\/span><\/p>\nObjective: To show transpiration in plants. Materials Required: A potted plant, polythene bag and cello-tape.
\nProcedure:<\/p>\n
\n- Take a well-watered potted plant having big leaves.<\/li>\n<\/ul>\n
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