Patterns of ageing and death, Biology

Assignment Help:

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.


Related Discussions:- Patterns of ageing and death

How are the fruits formed, How are the fruits formed? The fecundation i...

How are the fruits formed? The fecundation is in angiosperms triggers the release of hormones that act upon the ovaries. The ovary wall after that it develops into a fruit that

Characteristic features of phylum arthropoda, Characteristic Features of Ph...

Characteristic Features of Phylum Arthropoda Well-developed muscular system along with striated muscles attached to the exoskeleton, and visceral organs having smoot

Formation of double bonds, In eukaryotes  the SER has enzymes  able to begi...

In eukaryotes  the SER has enzymes  able to begin  double  bonds into fatty acyl CoA molecules  in an oxidation  reaction  which uses molecular  oxygen.  This reaction is catalyzed

Homo sapiens, Homo sapiens first appeared in the fossil record between 200,...

Homo sapiens first appeared in the fossil record between 200,000 to 300,000 years ago, The fossils were the Swanscomb man from England and Steinheim man from Germany. a) The Swa

Zoology, what is hydrostatic skeleton?

what is hydrostatic skeleton?

Genes and chromosomes, The gene is a distinct portion of a cell's DNA. Gene...

The gene is a distinct portion of a cell's DNA. Genes are coded instructions for making all the body needs, mainly proteins. Human beings have about 25,000 genes. Researchers have

Ketosis, K e to s i s It is also known as acetonemia in bovines or...

K e to s i s It is also known as acetonemia in bovines or pregnancy toxaemia in sheep and is associated with ketonemia, ketonuria and low blood glucose. E t iol

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd