l keicise . Imis small, conical portion has leaf and bud primordia that will mat

Question

l keicise . Imis small, conical portion has leaf and bud primordia that will mature in two years be able to: a woody bud scales dle scars, Obtain a preserved horse chestnut twig and locate the following regions or structures 1. The terminal bud is the large bud at the apex of the twig can be able to It is covered with modified leaves called bud scales. What is their function? res seen d in the 2. Leaf scars can be seen as somewhat triangular regions along the stem and represent the place where the leaf petiole was attached to the stem. What is their arrangement? (If necessary, refer to Exercise 3.) (2) l elements; d. of one. wood; 3. Use a dissecting microscope to examine several leaf scars. The small dots within each leaf scar are vascular bundle scars and represent places where the xylem and phloem branched from the stem into the leaf petiole. What is the most common number of these found in a leaf scar? tween y each 4. Lateral or axillary buds are found just above a leaf scar. (Remember the general relation of the leaf primordia and the bud primordia from Exercise 3?) Not all twigs ry and also se in issues vities of iums will have a full complement of lateral buds, since these 5. Lenticels are the small dots along the bark of the twig. completely developed. What is their function? (4) 6. Terminal bud scale scars appear as rings of cork tissue frequently get damaged during the growing season. These are the regions where the cork tissue is not e will condaryencircling the stem. They mark locations of the termi- nal bud in previous years. When the tissues inside the terminal bud begin to grow, the bud scales fall off, leaving these scars. 7. Make a diagram (Fig. 4.1) of an Aesculus twig that is in its third year of growth. (This means that you may have to modify your diagram from the actual age of 128) your specimen.) Label all of the seven previously p. Indicate the one-year-old and

Explanation / Answer

1.Terminal Buds are found at the end of the stem.It helps the plant to grow taller and collect the sources for the twig to grow.

2.When the leaf falls of its twig it leaves a mark that is called a leaf scar.They are formed naturally .The layer of cell called the abscissa layer is responsible for it.It leaves a scar behind which is healed over with protective cork.

3. In each leaf scar there are one or more than one bundle scar,which shows the cross section of vascular bundles that starts from the branch and ends to the petiole when the leaf is attached.

5. Lenticels are the small dots on the bark of the twig which helps in the exchange of gases like oxygen and carbon dioxide between the internal tissues of the twig and the environment.

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