Q. 84.1( 66 Votes )
Is it possible for you to recognize the leaves without seeing them? How?
Yes, we can recognize the leaves without seeing them. It is possible by taking an impression of the leaf. To get an impression, we put a leaf under a white paper. Hold the pencil tip sideways and rub it on the portion of paper having leaf below. You get
To get an impression, we put a leaf under a white paper. Hold the pencil tip sideways and rub it on the portion of paper having leaf below. You get the impression of the leaf with some lines on it. These lines on the leaf are called veins.
1) The design made by veins of a leaf is called leaf venation.
2) If we get the net-like design on both sides of midrib, then the leaf has reticulate venation.
3) If we get lines parallel to each other, then the leaf has parallel venation.
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Which of the following leaves have reticulate venation?
Wheat, tulsi, maize, grass, coriander (dhania), China rose.NCERT Science
Observed Fig. 7.3 and attempt the question that follow it.
(a) Label the parts 1, 2, 3 and 4 in the diagram.
(b) What type of venation does the leaf has?
(c) What type of venation is seen in grass?NCERT - Science Exemplar
Draw the veins of leaves given in Fig. 7.2 below and write the type of venation.
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Boojho wanted to test the presence of starch in leaves. He performed the following steps.
(1) He took a leaf and boiled it in water.
(2) He placed the leaf in a petri dish and poured some iodine over it.
He did not get the expected result. Which step did he miss? Explain.NCERT - Science Exemplar
Will a leaf taken from a potted plant kept in a dark room for a few days turn blue black when tested for starch? Give reasons for your answer.NCERT - Science Exemplar