Pollinia and massulae, Biology

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.

Posted Date: 1/23/2013 1:37:23 AM | Location : United States







Related Discussions:- Pollinia and massulae, Assignment Help, Ask Question on Pollinia and massulae, Get Answer, Expert's Help, Pollinia and massulae Discussions

Write discussion on Pollinia and massulae
Your posts are moderated
Related Questions
Lipids are essential fats that have much importance to the human body. Lipids are biological molecules that are insoluble in aqueous solutions and soluble in organic solvents are c

Define Analysis of Amino Acid sequence on Particular Peptide? The analysis of the relative order or the sequence in which the ammo acids are arranged-along the length of the

Patient after cardiac transplant The major focus of medical and nursing care after transplantation is to prevent early identification of rejection so that appropriate

Define transcellular fluid compartment - extracellular fluid? The transcellular fluid is a small compartment that represents all those body fluids which are formed from the tra

Do the arteries that carry blood from the heart to the lungs have arterial or venous blood? What happens to the blood when it passes through the lungs? Arteries of the pulmonar

Q. Using examples of invertebrate nervous systems how can the process of evolutionary cephalization be described? Considering the example of invertebrates it is observed that e

Question Write a short note on the following: 1 Gram staining 2 Embden-Meyerhoff-Parnas pathway 3 Interferons 4 Probiotics 5 Pasteurization 6 Endospores

Respiratory Insufficiency Respiratory insufficiency usually indicate inadequate exchange of oxygen and carbondioxide to meet the needs of the body during normal activities.

what is virus ?? what is classidication , uses , disease of viruses ? what are types of virus ?

AMITOSIS This  is  direct  cell division  in which  the genetic material is not duplicated and  hence its distribution  to the daughter cells  is not  precisely half  and half,