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Structure of the Leaf

Calyx closely...

Question

Calyx closely resembles leaves as each it of it posses three leaf traces. What are leaf traces?

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Solution

A leaf trace is the strand of vascular tissue that extends from the stem to the leaf base. It connects the vascular bundles of stem with leaf and thus facilitates transport of nutrients and water.

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Q. (a) Which is the biggest leaf in this picture?

(b) Collect some leaves from the garden. Place each of them here on this squared sheet. Trace out their edges and check how many squares there are in each leaf.
(c) Which is the biggest leaf?
(d) Which is the smallest leaf?

Q. Question 1. What happens to the colour of the leaf? What is the colour of the solution?

Now dip the leaf in a dilute solution of iodine for a few minutes.
Take out the leaf and rinse off the iodine solution.
Observe the colour of the leaf and compare this with the tracing of the leaf done in the beginning.

Question 2. What can you conclude about the presence of starch in various areas of the leaf?

The calyx is green in colour since it originates from a leaf.

Q. You remove four fresh tobacco leaves of similar size and age. Leave "leaf 1" as it is, smear "leaf 2" with vaseline on the upper surface, "leaf 3" on the lower surface and "leaf 4" on both the surfaces. Hang the leaves for a few hours and you observe that leaf 1 wilts the most, leaf 2 has wilted, leaf 3 wilted less than leaf 2 and leaf 4 remains fresh. Which of the following conclusion is most logical?

Tell the difference between :

(a) hibiscus leaf - peepul leaf

(b) calyx − corolla

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Structure of the Leaf

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