Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
The Exine Layer
It consists of two layers, inner (nexine) which is continuous and an outer (sexine) the sculptured one. The outer layer has ornamentations comprising rod-like bacula showing terminal expansion which sometimes fuses to form a roof like tectum perforated by micropores. During pollen development, the tapetum releases a mixture called tryphine, consisting of carotenoid lipid droplets and fibrogranular proteins into the thecal cavity. These fibrogranular proteins are enclosed in membrane bound cisternae. In tectate pollen, the released substances of tapetum become incorporated on the surface of pollen grains where cisternae membrane ruptures and protein released through micropores enter the tectum and accumulate in the interspaces of bacula.
Pollenkitt is the pigmented lipid fraction left on the surface of the tectum. Unlike intine, the exine held proteins exhibit only one enzymatic activity. The hydration of pollen is described to be stimulatory in releasing the proteins held in the pollen wall layers. The calculated time taken by the exine held proteins of sporophytic origin to pass out is 30 seconds while the intine of gametophytic origin takes a few minutes. This time difference in the protein release has made it easy to collect both samples separately. In SSI systems therefore the rejection reaction is faster than in GSI system.
Q. What are the main cellular functions of potassium? Moreover being important for the osmotic regulation and for the acid-base equilibrium (pH) potassium is fundamental for th
type of nutrition in platypus and ant eater
Explain what is Patent Ductus Arteriosus in details? Figure : Anatomical location of PDA Patent Ductus Arteriosus (PDA) may be an isolated defect or may co-exist with
Explain the Bacillus - Characteristics of Bacteria? Bacillus - It is gram positive, endospore former, obligate aerobic or facultative aerobic rods belonging to order Bacilliale
Trace the flow of blood through the systemic circuit (hepatic portal system) and the pulmonary circuit, beginning and ending in the left ventricle . You will be using named chamb
what type of gametes would be produced from genotype AA, Bb, AABb and someone who is heterozygous for 3 traits
What is the virus that causes flu? Why doesn't the body create permanent immunity against that virus? How does the vaccine against flu work? Flu is a disease caused by the inf
Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4
Define the first step to envision the pattern of deformation. The first step in the analysis is to envision the pattern of deformation that would accompany such a failure. In t
what is vagina explain with diagram
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd