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

Relevance of food packaging, Q. Relevance of food packaging? To unders...

Q. Relevance of food packaging? To understand the relevance of food packaging, it is necessary for us to understand how spoilage reduces the availability of food. In the deve

What are vitamins, Q. What are vitamins? What are the major vitamins needed...

Q. What are vitamins? What are the major vitamins needed by humans? Most vitamins are coenzymes fundamental substances for the enzyme functioning that are not produced by the o

Formation of gametes, In his experiments, Mendel noted that when two traits...

In his experiments, Mendel noted that when two traits are involved in a genetic cross, they are inherited independently of each other. The reason for this is that A. genes on the s

Fever, Fever influenza

Fever influenza

Fungal Reproduction, Hi, I have this presentation about the kingdom of fung...

Hi, I have this presentation about the kingdom of fungi, and no website could clearly explain the two processes of fragmentation and sporulation. I mean what are their steps? And w

Cow-pox (vaccinia), Epidemiology: This infection, although mostly occurrin...

Epidemiology: This infection, although mostly occurring in cows, sometimes also occurs in buffaloes. Under natural conditions, the infection takes place through inoculation by the

Define about the resistant starch, Define about the Resistant Starch? U...

Define about the Resistant Starch? Until 1980's starch was thought to be completely hydrolyzed and absorbed from the small intestine of man, independent of its source, type and

How to evaluate blanching efficiency, How to evaluate blanching efficiency?...

How to evaluate blanching efficiency? Finally, let us learn how to evaluate blanching efficiency? Normally, two of the more heat resistant plant enzymes, namely peroxidase and

What fraction of the total number of possible, Assuming that all human prot...

Assuming that all human proteins are 300 amino acids long, what fraction of the total number of possible different proteins is found in the human body?

Misuse of biology, MISUSE OF BIOLOGY - Biological achievements are used...

MISUSE OF BIOLOGY - Biological achievements are used against human race, e.g. 1 .       Bioweapons anitbiotic resistant infective micro-organism are used in wars. e.g., A

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