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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.
Q. What do you undersand by pollution? The Pollution is the contamination of an ecosystem by factors that are harmful for the equilibrium of its abiotic or biotic constituents.
The process by which gametes are produced in the gonads is known as gametogenesis. The process of formation of male gametes or sperm is known as spermatogenesis is of great sign
Q What are the three periods into which interphase are divided? Interphase is the preceding phase to the mitotic division. It is divided into three periods, G1, S and G2 the le
Q. Nutritional management of steatorrhoea? The Nutritional management of steatorrhoea should focus on the following: • Plenty of rest and relaxation and avoid stress •
VERTEBRAL COLUMN - It is curved vertical about 70 cms. long. It consists of 33 vertebrae (after fusion 26). It shows 4 curvatures - (i) Cervical curvatures
Prevention of flap dehiscence Flap margin dehiscence (separation) is prevented by approximating the edges of the flap over healthy bone by handling the edges of the flap gently
HISTORY ON CLASSIFICATION IN BIOLOGY
a) Produce annotated diagrams that illustrate how nerve impulses travel i) along a neurone ii) across a synapse.
why is a potted plant destarched before starting the experiment to investigate the factors necessary for photosynthesis
What is Asexual Reproduction? Asexual reproduction occurs in prokaryotes through the process of binary fission. Primitive eukaryotes and plants also reproduce by various t
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