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Q. What is the evolutionary importance of pteridophytes?
As the first pteridophytes, tracheophytes were also the first plants to extensively colonize the terrestrial environment forming forests. They also constituted a vital source of food for terrestrial animals. By presenting conductive vessels they could be superior, a feature inherited from them by phanerogamic plants.
Calf diptheria The disease is a serious one usually affecting calves up to 2 years of age. The lesions are confined to larynx and pharynx, and consist of well-defined areas of nec
What is the most excellent identification hypothesis for a plant tissue seen under the microscope having most cells undergoing cell division? The most excellent hypothesis is t
ABO blood groups in humans are controlled by the gene I. It has three alleles - IA, IB and i. As there are three dissimilar alleles, six different genotypes are possible. How many
Embryonic stem cells: can differentiate into all cell types of the specialized embryonic tissues when given sufficient and necessary stimulation for a specific cell type, e.g. Plu
methods of isolating and purifying two useful products from microorganisms
Obturator - Ovule An obturator is an outgrowth of the placenta or funicle or integument or style near the micropyle. It is presumed to guide the pollen tube to the micropyle.
What is Class Gastropoda in animal kingdom? Snails and slugs are referred to as gastropods because of their characteristic body plan. "Gastro" is derived from the Greek word fo
The organisms that live in hostile environments that cannot support other forms of life are members of what kingdom?
Nervous System of Asteroidea The nervous system of steroids is not ganglionated and is closely related with epidermis. It consists mainly of a circumoral nerve ring surroundin
Fliylurn Basidiomycetes 1) The asexual reproduction is by means of basidiospores which are produced on a microscopic, club-shaped basidium. 2) The basidia are found in a fru
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