Formed Elements in Blood And Their Functions:
Erythrocytes or red blood cells (RBC).These molecules play a significant role in transport of respiratory gases.
Leucocytes or white blood cells (WBC).They are of two types, viz. granulocytes and agranulocytes. Neutrophils, eosinophils and basophils are different types of granulocytes, while lymphocytes and monocytes are the agranulocytes. Neutrophils and monocytes (6-8 per cent) are phagocytic cells which destroy foreign organisms entering the body. Basophils secrete histamine, serotonin, heparin, etc., and are, involved in inflammatory reactions. Eosinophils (2-3 per cent) resist infections and are also associated with allergic reactions. Lymphocytes (20-25 per cent) are of two major types - '8' and 'T' forms. Both B and T lymphocytes are responsible for immune responses of the body.
Platelets or thrombocytes. Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.

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.

Cambium is present between xylem and phloem, in open vascular bundle. They have the capability to undergo secondary growth. They are found in dicot stems. Cambium is absent in closed vascular bundle. They don't have the capability to undergo secondary growth. They are found in monocot stems.

Simple tissues are composed of similar cells. Complex tissues are composed of dissimilar cells. Simple tissues provide bulk and mechanical support to plants. Complex tissues are meant for transportation of substances and they also provide mechanical support.

Companion cells help in maintaining pressure gradient in sieve tubes. Pressure gradient is important for conduction of materials in phloem.

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

Differentiate between bract and bractole are

Gynoecium is the female reproductive whorl of the flower. It is composed of one or more carpels. Each carpel is differentiated into three parts. i.e the ovary, style and stirma.
Placenta is the tissue on which ovule(s) develops in the ovary. The placentation in the ovary may be
(i) marginal
(ii) axile
(iii) parietal
(iv) basal
(v) free-central

(i) Sepals It is the green leaf-like outermost whorl
(ii) Petals It is the second whorl (corolla) from below often brightly coloured floral parts.
(iii) Stamens Third whorl of knobbed thread-like male reproductive floral parts. 
(iv) Carpels Central single whorl of female reproductive floral parts