Meiosis Significance (Bengali version)

-


 



Comments

Post a Comment

Popular posts from this blog

Economic importance of bryophyte.

-
Economic importance of bryophyte.                   Bryophytes are the amphibian member of plant kingdom, which are also known as moss.Unlike most of the higher plants bryophytes are found in groups of individual   and they never form any mechanical tissue.Bryophyte often play in the economy of nature, as ecological indicator, medicinal raw materials and many other aspects. The economic importance of   bryophytes are grouped in to following headings ........................... A.    Ecological Importances :            Bryophytes are important constituent of ecosystem in temperate and tropical region   of earth.They are ecologically important because of following reasons 1. Bryophytes and plant succession : Among the bryophytes the mosses are considered to potent forms of successional process. They colonize over   the nutrient poor   sides, where no other plant can survive. After death and decay they form humus and increase   the soil fertility.Some important species under this
Read more

Herbicides

-
  Herbicides   Herbicide is a chemical substance used to control or manipulate undesirable vegetation, especially weeds. They are extensively used in gardening, farming, and landscape turf management.   Classification of herbicides Herbicides are classified according to their:- Selectivity Mode of action Timing of application Chemical group Mechanism of action   2.1 Selectivity:   A) Non-selective herbicide kills or damages all plant life in a treated area (e.g., Glyphosate).   B) Selective herbicide will kill weeds in a germinating or growing crop without   harming the crop beyond the point of recovery (e.g., 2, 4-D used to control broadleaved weeds in a grass pasture; Avadex to control wild oats in cereals)   2.2 Mode of action:   A) Contact herbicides – Kills plant parts covered by the herbicide and are directly toxic to living cells. There is little or no translocation or movement of the material through the plant. Contact herbicides are effective against annual weeds but they onl
Read more