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Q. How are gametes formed in the pteridophyte life cycle, by mitosis or meiosis? What is the type of meiosis that occurs in pteridophytes?
In pteridophytes gametes are made by mitosis from special cells of the gametophyte. As in pteridophytes, in all plants, meiosis is sporic, that is cells of the sporophyte undergo meiosis and generate spores that then by mitosis develop into the gametophyte.
Vapour Pressure The intermolecular forces in a liquid prevent most molecules from escaping from the surface. However, due to molecular collisions, some molecules have sufficien
BON E - Bone is the hardest tissue in the body and supports various organs. The inorganic salts present in the matrix are calcium phosphate, calcium carbonate, calci
Q. Describe Palynological Evidence? Palynology is the study of pollen and spores. The taxonomic characters of pollen grains include wall structure, polarity, symmetry, shape an
LIF E AS AN EXPRESSION OF ENERGY CHANGES - Energy is explained as capacity of body to do work. Energy may be as potential (stored) or kinetic (expended) energy. It ex
What is gastrulation? How during gastrulation are the first two germ layers formed? What are these germ layers? Gastrulation is the process by which a portion of the blastula w
Q. How is the sound vibration captured by the tympanum transmitted through the ossicular chain of the middle ear? The acoustic transmission from the middle to the external ear
Explain Therapeutic diets Therapeutic diets are adaptations of the normal or regular diet. In other words, it is a diet for a patient suffering from a specific disease su
Several TCA cycle intermediates can be used as a substrate for the synthesis of other compounds. Succinyl CoA is on intermediate that is directly used for the synthesis of which of
Why do ribosomes move along mRNA during translation? During translation the ribosome always exposes two mRNA codons to be translated by moving along the mRNA. When a peptide bo
HUMA N HEART (MAMMALIAN HEART) - Position - Situated in thoracic cavity in pericardial cavity close to its front wall. Its broad base faces upward and backward. Its narrow a
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