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

HUMAN SKELETON, What are the main components of the human skeleton?

What are the main components of the human skeleton?

Chronic aortic regurgitation-indications for surgery, Chronic Aortic Regurg...

Chronic Aortic Regurgitation :  Several factors have to be taken into account before recommending surgery. These include severity of symptoms and LV function. With evidence o

Explain what is correction of hypovolemia, Explain what is Correction of Hy...

Explain what is Correction of Hypovolemia ? Intravenous fluids should be given to correct hypovolemia and optimize preload to the heart. This is particularly important in sept

What is the menstrual cycle, What is the menstrual cycle? The menstrual...

What is the menstrual cycle? The menstrual cycle is the periodic succession of interactions among hormones and the organs of the female reproductive system that, after the star

Difference between cryptogamic and phanerogamic plants, What is the differe...

What is the difference among cryptogamic and phanerogamic plants? Cryptogamic (hidden sex organs) plants are those that do not show flowers or seeds. They comprise the bryophy

What is technetium 99m sestamibi scan, Q. What is Technetium 99M Sestamibi ...

Q. What is Technetium 99M Sestamibi Scan? This study is another form of studying perfusion of the heart. This radioactive study is similar to that of thallium 201. With a combi

Analysis of genomic equivalence of nuclei, Analysis of Genomic Equivalence ...

Analysis of Genomic Equivalence of Nuclei Towards the ending of 19th century August Weismann had proposed that during cleavage the genetic determinants (later shown to be chro

#title., poor metabolism phenotype will have

poor metabolism phenotype will have

Define root canal perforations - time of treatment, Define Types of Root Ca...

Define Types of Root Canal Perforations According to the time of treatment According to the time of treatment in relation to occurrence: Fresh perforation: treated immed

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