Seed dormancy - plant growth substances, Biology

Assignment Help:

Seed Dormancy - Plant Growth Substances

Seed dormancy is critically important for the survival of plants. Factors involved in seed dormancy are:

A. Environmental Factors

  1. Light requirement for germination-positive or negative
  2. High or low temperatures
  3. Absence of water

B. Internal Factors

  1. Seed coat-prevention of gas exchange
  2. Seed coat-mechanical effects
  3. Embryo immaturity
  4. Low ethylene concentration
  5. Presence of inhibitors
  6. Absence of growth promoters.

C. Timing Mechanism

  1. After-ripening
  2. Disappearance of inhibitors
  3. Synthesis of growth promoters

Related Discussions:- Seed dormancy - plant growth substances

A plant growing on a mountainside, What two abiotic factors might affect (a...

What two abiotic factors might affect (a) an animal living at the bottom of the sea, (b) a plant growing on a mountainside?   (a) The abiotic factors which might

State the term - neuroanatomists broadmann, State the term - Neuroanatomist...

State the term - Neuroanatomists Broadmann Neuroanatomists Broadmann used a combination of staining and microscopy to map the cytoarcitecture (cell structure\type) of human ce

Assessment of ventricular septal defect, Assessment   On assessment a c...

Assessment   On assessment a child with ventricular septal defect will show clinical manifestations depending upon the size of  the defect. The small defects are usually asympt

Opiate narcotics - psychological drug dependence, OPI A T E NARCOTICS - ...

OPI A T E NARCOTICS - They suppress brain activity and relieve pain popularly known as pain killers. They are sedative and astringent in nature. An astringent cause

Impulse in the sensory neurone, Explain briefly how the stimulus at the fin...

Explain briefly how the stimulus at the finger produces an impulse in the sensory neurone using the following key words. 1. Energy conversion (linked to receptor) 2. Na+ in 3. Depo

State long-term benefits of exercise, State four long-term benefits of exer...

State four long-term benefits of exercise. The long-term advantages of exercise are: a) Enhance in size of the muscles used, b) Decrease of heart rate and c)  Enhance

Nursing assessment of thalassemia patient, Nursing Assessment  If you ...

Nursing Assessment  If you observe a child of thalassemia major you can identify the following clinical  manifestations:  Anaemia with haemoglobin level of 3 to 8 gm per ce

Define affluence availability of food as factor for obesity, Define Affluen...

Define Affluence and abundant availability of food as factor for obesity? With increasing affluence, increase in purchasing power and abundance of food, people tend to eat more

How artificial sweeteners are available as sugar substitute, How the artifi...

How the artificial sweeteners are available as sugar substitute? Some of these are available as tablets, as sugar substitute and others appear as ingredients in many food produ

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