Light requirement - seed dormancy, Biology

Assignment Help:

Light Requirement - Seed Dormancy

The light requirement for germination of many seeds is presumably a mechanism that prevents the germination of small seeds buried deep underground, where they would exhaust their reserves before reaching the surface ad becoming autotrophic. However, after a fire many seeds germinate at once, and forest regeneration begins.

This mechanism prevents overcrowding in a mature forest and ensures rapid re-growth after a disaster. Not all seeds require light for germination; some are unaffected and a few are inhibited by light. Blue light at quite high intensity has some effect on the germ ination of certain seeds, but it is not clear whether this is mediated through the absorption of blue light by phytochrome or by some other pigment.


Related Discussions:- Light requirement - seed dormancy

Define food quality factors and their measurement, Define Food quality fact...

Define Food quality factors and their measurement? Appearance; textural, flavour, nutritional, sanitary and keeping factors; quality standards, objective and organoleptic evalu

Physiological condition for growth, PHYSIOLOGICAL CONDITION FOR GROWTH - ...

PHYSIOLOGICAL CONDITION FOR GROWTH - It depends on anabolism and cetabolism. If anabolism is more positive growth. If both are balanced growth is zero. If cetabolism is more

Explain biochemical or physiological risk factors, Explain Biochemical or P...

Explain Biochemical or Physiological Risk Factors ? The biochemical or physiological risk factors are those abnormalities, some of which are metabolic in nature, which give ris

Understanding life, UNDERS T ANDIN G LIF E - Presence of proto...

UNDERS T ANDIN G LIF E - Presence of protoplasm is the important feature of life which acts the site of metabolism. Maintenance of life by protoplasm requires conti

Define the dietary guidelines, Define the Dietary Guidelines? Dietary G...

Define the Dietary Guidelines? Dietary Guidelines are becoming increasingly powerful tools to help the general public to appreciate the role of diet in prevention of degenerati

What are the factors that for influencing photosynthesis, Q. What are the f...

Q. What are the factors that for influencing photosynthesis also interfere with the gross primary productivity? Mostly light and water, but as well mineral salts, carbon dioxid

Consciousness as inner state, Q. Explain Consciousness as inner state? ...

Q. Explain Consciousness as inner state? Consciousness as inner state: We are conscious of thoughts, images, emotions and memories within ourselves though they may not have phy

How is the smoothing tendency of cornea functioned, How is the smoothing te...

How is the smoothing tendency of cornea functioned? Smoothing tendency: In health and in disease condition the epitheliurm has a strong tendency to smoothen the underlyin

POPULATION, WHAT ARE THE CHARACTERISTICS OF POPULATION IN ANIMAL

WHAT ARE THE CHARACTERISTICS OF POPULATION IN ANIMAL

Procedure for nelson somogyi method for glucose estimation, Explain Procedu...

Explain Procedure for nelson somogyi method for glucose estimation? Carry out the procedure following the steps enumerated herewith: 1. Label a series of  Folins tubes as bl

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