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
Q. Explain about Myocardial Infarction? It is an initial acute phase of cardiovascular disease caused by the blockage of a coronary artery supplying blood to the. Heart shows t

Q. What are other important human diseases caused by protozoans? Some other significant protozoan infections are amebiasis, trichomoniasis, giardiasis, leishmaniasis, meningoen

Explain the Advantages of Double Beam Method? The double beam method has advantage over single beam as it automatically corrects, for the change in light transmission, through

Radiographic Examination Radiographs are an important tool to evaluate the bone levels, health and implant integrity.  Annual radiographs following treatment are recommended in

P A TTERN OF GROWTH - 1 .       ISOMETRIC - In it an organ grows at the same rate as the rest of body. External form of body is not changed. eg. fish, locust. 2 .

Characteristics of Nutrient Uptake These results show certain characteristics of nutrient uptake. Selectivity: Certain mineral elements are taken up preferentiall

Question 1: Briefly explain the applications of various technologies in biotechnology. Definition of biotechnology Brief on different applications of various technolo

Habits: Any abnormal habits needs to be identified. Following habits may have detrimental effect on the implant: 1. Parafunction -  Bruxism/ Clenching 2. Tongue Thrusting

What is optic nerve The optic nerve contains more than one million axons that initiate in the ganglion cell layer of the retina. This structure originatcs at the back of the e

Disorders of motor neurons and the spinal cord A number of movement disorders are produced by damage either to the spinal cord or to cortical projections to the spinal cord. Th