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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.
Define Classification - Taxonomy Classification is the arrangement of organisms into groups having common characteristics. These groups are then arranged according to a system.
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you are setting up a pcr reaction to amplify a 1000 basepair long dna grament. in your 50 microliter reaction volume you have 100 nanogrM OD RWMPLrw sn QIRH eoufly 50/50 at/gc 100
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Define species according to the biological species concept. What two problems often make this definition impractical?
Ecology Very often a word has a precise well-defined meaning in scientific literature but is loosely used in everyday language. It is, therefore, necessary for you to be clear
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