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

What is plant transpiration, What is plant transpiration? What are the two ...

What is plant transpiration? What are the two main types of plant transpiration process? Which of them is more significant in volume? Transpiration is the loss of water from th

How to reduce the stresses on the implant, How to reduce the stresses on th...

How to reduce the stresses on the implant i) There is need to reduce the stresses on the implant - ii) Frequent recall for maintenance or hygiene appointments. iii) Gingi

What are the major types of lipids, Q. What are the major types of lipids? ...

Q. What are the major types of lipids? The main types of lipids are phospholipids, triglycerides (fats and oils), waxes and steroids.

Determination of limb polarities, Determination of Limb Polarities The...

Determination of Limb Polarities The limb pattern is characterized by three axes (or polarities) as displayed in diagram:  (1) The direction from the shoulder (or hip) to t

Metabolism, What is Metabolism ?  The  sum total of vital activities ( ...

What is Metabolism ?  The  sum total of vital activities ( movements , nutrition, growth, respiration, excretion , reproduction, behaviour ,etc.  Is the  life  of a living  bei

Effect of single base pair mutation on the cftr protein, Cystic fibrosis (C...

Cystic fibrosis (CF) is caused by a variety of mutations in the CFTR gene. Imagine you have identified a new single-base pair mutation (A→T) in an exon of the CFTR gene. You wish t

Illustrate the electrophysiology and ion transport of cornea, Illustrate th...

Illustrate the electrophysiology and ion transport of cornea? Electrophysiology and ion transport of cornea: The trans-epithelial potential is 25-35 mV. It is almost 50 p

Explain the term- latent squint, Explain the term- Latent Squint (Anisophor...

Explain the term- Latent Squint (Anisophoria or Heterophoria) This eye condition occurs when the balance of extra-ocular muscles is altered. There is a tendency of the eye to

State the replication of dna strands, Which of the following statement is t...

Which of the following statement is true regarding the replication of DNA strands? A. The products of replication include one double helix made exclusively of parental DNA and

Zoology, Write briefly on neural mechanism of learning?

Write briefly on neural mechanism of learning?

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