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Q. Bird identity card. How are birds characterized according to examples of representing beings, basic morphology, respiration, skin, nitrogen waste, circulation,thermal control and types of reproduction?
Examples of representing beings: chickens, sparrows, parrots, ostriches, penguins. Basic morphology: pneumatic bones, aerodynamic body, feathers, horny beaks. Skin: impermeable feathers, keratinized, uropygial gland. Respiration: pulmonary, Circulation: complete and closed, heart with four chambers. Nitrogen waste: uric acid, Thermal control: homeothermic. Kind of reproduction: internal fecundation, sexual, shelled eggs with extraembryonic membranes.
CAUSE S OF VARIATION - Effect of environmental conditions Change in the gene pattern like - (a) Random distribution of homologous genes in meiosis (b) Crossing over
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Erwin Chargaff conducted a series of experiments in which he was calculating the amounts of dissimilar nucleotides that were present in dissimilar tissues and organisms. These stud
why phloem made of living cells
FUNCTIO N OF AMINO ACIDS Proteins are polymers of amino acids. Glycine form porphyrin nucleus in chlorophyll and heme (= haem) proteins like haemoglobin and cytochrome
Q. In which period of meiosis does the pairing of homologous chromosomes occur? The pairing of homologous chromosomes is a very important step for meiosis because the rightness
Psychiatric Emergmcy: Psychiatric Emergmcy is the treatment of disorders of mood, thought and behavior in an emergency setting. Psychiatric emergencies are conditions in w
Q. How is the chromosome region where the centromere is located called, and how chromosomes classified in the relation to the position of their centromere? The chromosome regio
Induction in Metamorphosis Some of the morphogenetic changes throughout metamorphosis are found fo be quite independent of hormone action. For instance, generally during meta
classes of phylum porifera
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