Exchange of gases.

Presence or absence of hair on the epidermis will give the clue. Those with hair are slides of root. Cuticles will be present on the slide of stem.

As shown in above diagrams the vascular bundles in dicot stems are arranged in a ring, while they are in scattered arrangement in monocot stems.

A loculicidal capsule with endospermic seeds.

The presence of nodulated roots.

Thorns are woody pointed,straight structures to protect plants from browing animals e.g. Baugainvillea

Distinguish between stamen and staminoide are

Arachis Hypogea (groundnut) and Glycine max (soyabean)

Tendrils of grapevine and pumpkin are stem structures while those of pea are foilar in nature. Hence, the tendrils of grapevine and pea are analogous structures.

Tap roots of some plants become fleshy due to storage of reserve food. The main root stores extra food whereas secondary roots are thin and are involved in absorption of minerals from the soil. The swollen roots occur in different shapes.

When a runner gets cut incidentally into the several parts and each can grow independently.

Stomata are found on both surfaces in monocot leaves, while they are found on ventral surface only, in dicot leaves. In monocot leaves, venation is parallel, which is evident by similar size of vascular bundles. In dicot leaves venation is reticulate, so vascular bundles are of various sizes.
Spongy mesophyll is present in dicot leaves, and absent in monocot leaves.

Structure of Parenchyma. It is composed of round, spherical or polygonal cells. Cells are isodiametric with thin walls. The tissue has intracellular spaces. Function. Photosynthesis, food storage and secretion.

Cross Section of Dicot Root

(a) Free-central placentation, e.g., primrose.
(b) Parietal placentation, e.g., mustard.

(a) Underground parts of a plant are not always roots. Sometimes stem or stem branches occur underground to perform some special functions. For example, potato tubar is a modified stem which is underground. A potato tubar shows nodes and internodes, scale leaves and buds at the nodes.
(b) Flower is a modified shoot consisiting of a highly reduced stem bracnch to form thalamus in which the nodes are borne only towards the trip. The floral parts, i.e. sepals,petals,stamens and carpels are arranged in their respective whorls and arise from  nodes.

Isobilateral (Monocotyledonous) Leaf

Structure: -
1. Epidermis is composed of single layer of cells. 
2. Stomata are present on both surfaces of leaf.
3. Mesophyll is not differentiaited into palisade and spongy parenchyma.
4. In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells. When the bulliform cells in the leaves have absorbed water and are turgid, the leaf surface is exposed. When they are flaccid due to water stress, they make the leaves curl inwards to minimise water loss.
5. The parallel venation in monocot leaves is reflected in the near similar sizes of vascular bundles (except in main veins) as seen in vertical sections of the leaves.
Differences between Dicot and Monocot Leaf