ETHYLENE
sanaSmoke was used for ripening of bananas in old time. Later it was found that smoke contain ethylene. It was found that this gas is also produced by the plant.…
NUCLEOLUS
rubabThe most visible structure within the non dividing nucleus is the nucleolus. The nucleolus is a 11011-membranous bound structure. The function of the nucleolus is to synthesize ribosomes. Sometimes, there…
Abscisic Acid (ABA) and its role in plant growth
P.F. Wareing in U.K. and F.T. Addicott in USA in 1961 discovered growth inhibiting hormone. It was named abscisic acid (ABA). Abscisic acid was discovered from the leaves of Acer…
CYTOKININS
Cytokinin stimulates the cell division in plants. It has following history of discovery: Earlier, it was believed that coconut milk contain cell division causing factors. The developing endosperm of maize…
GIBBERELLINS
Gibberellin was discovered by Kurosawn in 1928. He observed that a rice. plant was infected by the fungus Gibberella. It showed excessive stein elongation. The symptom is called "Bakanae- disease.…
NUCLEAR ENVELOPE
Nuclear envelope encloses the nucleus. So it separates nuclear contents from the cytoplasm. It is continuous with the ER at number of points. Structure .1.1ic nuclear envelope is composed of…
PLANT HORMONES
The special substances produced by the plants which influence the growth and plant responses are called plant hormones. Plant hormones are auxins, gibberellins, cytokinins, abscisic acid and ethylene. AUXINS The…
NUCLEUS
Nucleus contains most of the genes that control the cell. It is the most conspicuous organelle in the Eukaryota cell. Its average diameter is about 5. It performs two major…
GROWTH
The quantitative increase in plant body is called growth. Following processes are involved in the growth and development of plants: Cell division Cell elongation Differentiation of cells into tissues and…
Morphological Characters of Leaves
sidraLeaves are green flat structures borne on the stem or on the braches. Leases arise from the nodes. I hey have buds in their axils. Lein es increase the surlitee…