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

Explain some advantages of most probable number, Explain some Advantages of...

Explain some Advantages of Most Probable Number? 1. It is simple and method of choice for determining fecal coliform densities. 2. Results of different laboratories are comp

Explain the meaning of protein deficiency, Explain the Protein Deficiency? ...

Explain the Protein Deficiency? One of the most common nutritional disorders in the world today is the deficiency of protein. Both adults and children are affected, as the popu

Plant physiology, detail notes on seed dormancy and seed germination

detail notes on seed dormancy and seed germination

Explain the pre pregnancy weight and foetal outcome, Explain the Pre Pregna...

Explain the Pre Pregnancy Weight and Foetal Outcome? Several studies from around the world from developing and developed countries have demonstrated an association between pre-

The atomic number of the isotope 238u of uranium is 92, The atomic number o...

The atomic number of the isotope 238U of uranium is 92. The nucleus of this isotope contains a) 184 protons, 92 electrons, and 54 neutrons. b) 92 protons and 146 neutrons. c) 92 pr

Mycoplasmosis, Contagious bovine pleuropneumonia (CBPP) This is a highl...

Contagious bovine pleuropneumonia (CBPP) This is a highly fatal disease of cattle and of major economic importance in certain tropical countries. It also affects buffaloes, bis

Genetic, 1. The genes for ruby eyes (rb), tan body (t) and cut wings (ct) a...

1. The genes for ruby eyes (rb), tan body (t) and cut wings (ct) are all found on the X-chromosome of Drosophila melanogaster. All of these are recessive traits. They map in the or

How to improve the quality of protein in the diet, How to improve the Quali...

How to improve the Quality of Protein in the Diet? Since the net protein utilization (NPU) values of milk or egg proteins are higher than those of proteins of average diets con

Which cell organelles are well-developed in secretory cell, Q. Which cell o...

Q. Which cell organelles are well-developed in secretory cells? In secretory cells, like the secretory cells of endocrine glands, organelles related to production, "exportation

What are the types of muscle tissues, What are the types of muscle tissues?...

What are the types of muscle tissues? What are the morphological features that differentiate those types? There are three kinds of muscle tissue: the skeletal striated muscle t

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