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

Classification of instrument sterilisation, The classification was given by...

The classification was given by Spaulding and is based on the contact with different tissue types to determine whether sterilization or disinfection is needed. 1. Critical item

Classify biomaterials and list some examples, Q. Classify biomaterials and ...

Q. Classify biomaterials and list some examples? Biologic classification is based on tissue response and systemic toxicity effects of the implant and is divided into three clas

PHYLUM ANNELIDA, GERENAL CHARACTERICS OF PHYLUM ANNELIDA

GERENAL CHARACTERICS OF PHYLUM ANNELIDA

Water stress - responses of plants to stress, Water Stress - Responses of P...

Water Stress - Responses of Plants to Stress Water stress in a plant can result from drought, excess salinity in the soil and very low or high temperatures. It has been found

Plant physiology.., why does the removal of the extremity of coleoptile pro...

why does the removal of the extremity of coleoptile prohibit plant growth?

What body systems respond to resist the changes, Jennifer has the "stomach ...

Jennifer has the "stomach flu" that is going around campus and has been vomiting profusely for the past 24 hours. Not only has she been unable to keep down fluids or food but she h

What is the goal of biological classification, The goals of biological clas...

The goals of biological classification The world of animal diversity is quite complex and it requires an ability to recognise similarities and differences among organisms. Class

Determine the lateral cephalometric skull view, Determine the Lateral Cepha...

Determine the Lateral Cephalometric Skull View The use of this modality is limited in preoperative evaluation in implant placement for advance cases where there is a need for b

Results-ross operation--surgical techniques, Results: The risk of isolate...

Results: The risk of isolated aortic valve replacement is 3-4 per cent. The long term survival for 5, 10 and 15years is 75 per cent, 60 per cent and 40 per cent respectively. The

Protozoa, disadvantages of protozoa in points

disadvantages of protozoa in points

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