Pollinia and massulae, Biology

Assignment Help:

Pollinia and Massulae

In most cases the pollen grains of each tetrad become separated from one another and they lie freely in the pollen sac. In some plants, mostly members of Ericaceae, the pollen grains remain in tetrads even when mature. In certain plants, such as Acacia, the tetrads are stuck together as groups, which may contain as many as 64 pollen grains. In some other plants, such as members of the Asclepiadaceae, all the pollen grains of a sac are united in a single compact mass such a mass is termed a pollinium. In some members of the family Orchidaceae the anthers produce groups of pollen grains which are loosely jointed among themselves, usually by means of viscin threads. These groups are called as massulae.


Related Discussions:- Pollinia and massulae

Show foods that damage gi mucosa, Q. Show Foods that damage GI mucosa? ...

Q. Show Foods that damage GI mucosa? Foods that damage GI mucosa: A number of spices, herbs and other condiments have been found to have little or no irritating effect on the m

What is arteriole diameter, The axons of all the baroreceptors in the body ...

The axons of all the baroreceptors in the body were destroyed at 2 AM.  All else is normal.  Which of the following statements is true for the system at 2:10 AM when compared to th

Treatment of diarrhoea, Treatment   Most cases of diarrhoea do not need...

Treatment   Most cases of diarrhoea do not need antibiotic therapy as the bacterial or parasitic organism are not isolated from most of the cases. However chemotherapeutics  ar

Define phosphorous distribution in plasma, Define Phosphorous distribution ...

Define Phosphorous distribution in plasma? In plasma, phosphorus is distributed in different forms. Figure: Phosphorous distribution in plasma Inorg

Bees, is there a difference between the giant asiatic bees apis dorsata and...

is there a difference between the giant asiatic bees apis dorsata and Philippine giant bees apis breviligula

Membrane oxygenators-type of oxygenators , Membrane Oxygenators: They are...

Membrane Oxygenators: They are more physiological and are similar to natural lungs. There is separation of blood and gas by membrane across which gas exchange takes place. There

Emergence of contemporary biology, EMERGENC E OF CONTEMPORARY BIOLOGY - ...

EMERGENC E OF CONTEMPORARY BIOLOGY - 1 .       Aristotle (384-322BC) - Greek Classified animal species and arranged them in hierarchies. Formulated 'Great chain of

Define ovule, A vertical section of an ovule is shown below.  The correct p...

A vertical section of an ovule is shown below.  The correct ploidy levels of the four structures P, Q, R and S respectively are: a.  n, 2n, n, n b.  2n, n, n, n c.

Quick transient responses - behaviour of plants, Quick transient responses ...

Quick transient responses - Behaviour of Plants Such responses are stimulated by factors showing significant variations over relatively small time period e.g., those showing w

How does the structure of a chloroplast enable, How does the structure of a...

How does the structure of a chloroplast enable it to build up a concentration gradient of protons?  Chloroplasts have an inner membrane system having of thylakoids. The pumpin

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