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

Explain briefly nucleic acids dna and rna, Explain briefly Nucleic Acids (D...

Explain briefly Nucleic Acids (DNA & RNA)? Nucleic Acids (DNA & RNA) :  Nucleic acids are the molecules that contain genetic information that is inherited, and are responsibl

Define about the hyponatremia and hypernatremia, Define about the Hyponatre...

Define about the Hyponatremia and Hypernatremia? Serum concentration of sodium is normally regulated within the range of 135 to 145 milimole per litre (a). Hyponatremia is defi

What is law or theory of demand state, What is law or theory of demand stat...

What is law or theory of demand state? The law or theory of demand states as consumers we derive satisfaction or ‘utility’ like a result of consuming a good or a service. It va

Determine in brief about the classic migraine, Determine in brief about the...

Determine in brief about the Classic migraine This is probably the most interesting form, occurring in about 12% of migraine sufferers, because it begins with an aura, which us

What events occur during platelet plug formation, What is the role of plate...

What is the role of platelet plug formation in hemostasis? What events occur during platelet plug formation? Describe the circumstances that may induce inappropriate platelet plug

Freshwater animals, Freshwater Animals In Figure you have seen that th...

Freshwater Animals In Figure you have seen that the body fluids of freshwater animals are hyperosmotic to their aqueous surroundings. This results in two-kinds of osmotic prob

Explain composition of malt yeast peptone glucose medium, Explain Compositi...

Explain Composition of Malt Yeast Peptone Glucose Medium? Malt Extract - 3.0 gm Yeast Extract - 3.0 gm Peptone - 5.0 gm Glucose - 10.0 gm Agar - 15.0 gm Distille

#white blood cell, #White blood cell has mainly 5 types right? which is Neu...

#White blood cell has mainly 5 types right? which is Neutrophil,Monocytes,lymphocytes, basophil and Eosinophil? I wwanted to know is phagocytes a white blood cell, if yes then why

What are the symptoms of pectic ulcer, Q. What are the Symptoms of pectic u...

Q. What are the Symptoms of pectic ulcer? Increased gastric tone and painful hunger contraction when stomach is empty. Hunger contraction 1-3 hours after meals is the main com

Illustrate the conductance of potassium channels, A decrease in parasympath...

A decrease in parasympathetic discharge to the heart leads to A. an increase in the conductance of F-channels in SA node cells. B. a decrease in the conductance of potassium

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