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Principles Governing Cleavage
a) The nucleus and mitotic achromatic figure tend to occupy the centre of active cytoplasmic density of the dividing cells, e.g., in isolecithal eggs or microlecithal eggs, the spindle is formed centrally in the cell while in the telolecithal eggs, and it is formed nearer the animal pole.
b) Each new cleavage furrow tends to intersect the plane of the preceding cleavage furrow at right angle.
c) The cells or blastomeres tend to divide into two equal sized daughter cells unless yolk is unevenly distributed.
d) Free sides of the blastomeres tend to become rounded.
Q. What are the two divisions of the autonomic nervous system? The autonomic nervous system is divided into the parasympathetic nervous system and the sympathetic nervous syste
a) Name three parts of the body where smooth (involuntary or unstriated) muscle may be found. b) In any one of your examples, say what the smooth muscle does.
cymose
What are the Fat Requirements of athletes? Fats are the body's other major energy source. It is a well known fact that fat is a highly concentrated source of energy
Figure shows the flow of energy through the trees in a forest ecosystem.The numbers represent inputs and outputs of energy in kilojoules per m 2 per year. (a) (i) On Figure,
Q. Show the value of embryology? The value of embryology in solving taxonomic problems can be appreciated by studying some specific cases. Amongst the classical examples cited
1. Effect on general health: Noise pollution increases the rate of heart beat, constriction of blood vessels and blood pressure. Noise also causes anxiety, stres
Explain disease typhoid Typhoid is often called enteric fever because the infection or bacteria is found in the intestines and attaches itself to the epithelium of the intes
Chloroplast In plants, chloroplasts are the essential organelles for carrying out photosynthesis. Chloroplasts are found in all green plants. Chloroplast occurs mainly
how are excretory products brought to the excretory organs to be excreted?
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