3.3 - THE LEAF, VENATION

1. The axillary bud later develops into a ..........
5. The lamina or the leaf blade is the green expanded part of the leaf with ...... and.
8. The shape, margin, apex, surface and extent of ............. varies in different leaves.
12. Leaves originate from ............ meristems and are arranged in an acropetal order.
13. In some leguminous plants the leafbase may become swollen, which is called the ..........
15. The ........ help hold the blade (in exposing the lamina )to light.
17. When the veins run parallel to each other within a lamina, the venation is termed as ...........
18. There is, usually, a middle prominent vein, which is known as the .............
20. Leaves of ........... plants generally possess reticulate venation.

2. When the veinlets form a network, the venation is termed as ...........
3. The arrangement of veins and the veinlets in the lamina of leaf is termed as .............
4. Leaf develops at the .......... and bears a bud in its axil.
6. The leaf is attached to the stem by the leaf base and may bear two lateral small leaf like structures called ..........
7. ..............is the characteristic of most monocotyledons.
9. They are the most important vegetative organs for ...........
10. A typical leaf consists of three main parts: ........, petiole and lamina
11. ..........In , the leaf base expands into a sheath covering the stem partially or wholly. (Sheathy leaf base)
14. Long thin flexible petioles allow ........... to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface.
16. The leaf is a lateral, generally ........... structure borne on the stem.
19. Veins provide ......... to the leaf blade and act as channels of transport for water, minerals and food materials.