Describe the procedures described throughout this laborotory activity: 11.1 Plan

Question

Describe the procedures described throughout this laborotory activity:

11.1 Plant external:

In seeds, two cotyledons (part of the embryo) In seeds, only one cotyledon Usually three floral parts Usually four or or multiples of these) or muitiples Usually a notlike array of leaf veins Usually a parallel array of leaf veins Basically three pores or furrows in pollen grain Basically, one pore or furrow pollen grain vascular bundle Vascular Vascular bundles distributed throughout ground tissue of stem arrayed ? as a ring in stem DICOTS MONOCOTS Figure 11-2 Comparison of dicot and monocot structure. 11.1 External Structure of the Flowering Plant (About 30 min.) MATERIALS Per student group (table) a mature corn plant Per lab room: living bean and corn plants in flats a potted geranium and dumbcane plants a dishpan half-filled with water PROCEDURE A. Dicotyledons The common garden bean, Phaseolus vulgaris, is a representative dicot. Other familiar examples of di cotyledons (dicots) are sunflowers, roses, cucumbers, peas, maples, and oaks. Figure 11-3 as you study the bean plant Let's look at its external morphology. Label system in at portion usually below ground, and a typically aerial shoot system. Obtain a bean plant by gently removing it from the medium in which it is growing. Wash the root the dishpan provided, not in the sink. The plant consists of a root system, th Examine the root system first. The root system of the consisting of one large primary root (the taproot) from which lateral roots arise. Identify the taproot and lateral roots. Now turn your attention to the shoot system, consisting of the stem and the leaves. 1. 2. bean is an example of a taproot system, that is, one 3. 4. Identify the points of attachment of the leaves to the stem, called nodes; the regions between nodes are 5. Look in the upper angle created by the junction of the stem and leaf stalk to find the axillary bud. These 6. Find the terminal bud at the very tip of the shoot system. The terminal bud contains an apical meristem internodes. buds give rise to branches and/or flowers. that accounts for increases in length of the shoot system. 178

Explanation / Answer

Objective of the experiment is observing and understanding the structure of garden bean plant.

Firstly, bean plant from the medium is obtained and for evaluating the root and shoot system of the plant, root of the plant is washed in the wash pan. Bean plant has taproot system. Coming to shoot system, leaves attached to the stem are identified as nodes and then internodes. Region where stem and leaf stalk connects is called axillary busd, from where flowers arises. Growing end of the shoot system is called terminal bud which increases the whole length of the plant. Identify the length of the lower most bud from the soil, and you will find cotelydons at the end of the stem if the plant is younger one. On the leaves, petiole and stalk will be found. Finally you should identify compound leaf and mid veins. Hence by understanding these criteria, you will get the structure of whole bean plant.

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