Patterns of ageing and death, Biology

Patterns of Ageing and Death

Plants and their parts develop continuously from germination until death. The latter part of the developmental process, which leads from maturity to the ultimate complete loss of organisation and function, is termed senescence. It is a characteristic of plant behavior that senescence is not simply a running down of the life processes but is a highly ordered and programmed process or series of processes.

According to their habit of growth, plants senesce in many different ways. We will briefly discuss major events of senescence in plants:

1. Whole Plant Senescence: The whole plant may senesce and die at one time after flowering and fruit formation (all annual like wheat, rice, mustard belong to this category). Delay in flowering postpones senescence phase by keeping the plants alive in unfavorable conditions for flowering.

2. Organ Senescence: Parts of the plant like leaves undergo senescence after maturation. Rest of the plant remains alive. New leaves replace senescing leaves.

3. Tissue Senescence: Some tissues like sclerenchyma, tracheids and xylem vessels may senesce and die although the plant as a whole is in a state of good growth.

Posted Date: 1/24/2013 2:48:43 AM | Location : United States







Related Discussions:- Patterns of ageing and death, Assignment Help, Ask Question on Patterns of ageing and death, Get Answer, Expert's Help, Patterns of ageing and death Discussions

Write discussion on Patterns of ageing and death
Your posts are moderated
Related Questions
DIFFERENCES BETWEEN MITOSIS AND MEIOSIS    EVENTS  MITOSIS  MEIOSIS  Occurrence  In all the body cells including

Describe DNA replication in details? Replication :  DNA replicates itself by first breaking the hydrogen bonds between the nitrogen base pairs, and "unzips" itself into two s

Proteins - classification, composition and biological functions  Proteins, as you may already know, are made up of carbon, hydrogen, nitrogen, oxygen and usually sulphur. Prot

Disposal : Opaque bags are the recommended for disposing off carcasses. You should also put freshly dissected animals and tissues into opaque plastic bags, seal them and dispose t

Vascular Preoperative administration of a cephalosporin decreases the incidence of postoperative surgical site infection after arterial reconstructive surgery on the abdominal

Total Fertility Rate Total fertility rate (TFR) is the total number of children a women can be expected to bear in a given population if birth rates are constant for at least


After glaciers, ice caps and snowfields, ground water is the next largest fresh water reservoir. Precipitation that does not evaporate back into the air and does not run off over t

What are some ways that humans can reduce the effect they have on the phosphorus cycle?

Explain the Equilibrium Dialysis? Equilibrium dialysis is a useful technique for studying the binding of a small uncharged solute species (a ligand) to a macromolecule. The mac