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Q. What is the evolutionary importance of the emergence of seeds in the plant kingdom?
The evolutionary significance of the seed is related to the plant capability of distant colonization and to the protection of the embryo. Embryo-containing seeds can be carried by wind, water and germinate and animals in different environments. This fact contributes to the exploration for the diversity of plant species and of a variety of ecological niches.
Seeds in addition protect the plant embryo against external aggressions and they also provide germination under more satisfactory conditions (inside the seed). These characteristics contribute to the evolutionary accomplishment of the phanerogam.
MOSAI C THOERY - It was given by W. Roux. He studied the development of frog's egg. He destroyed one cells by a hot needle out of 2-cells formed as a result of first cleava
what is the protozoa?
What is the phenotype? Phenotype is every observable characteristic of a living being conditioned by its genes. A few phenotypes may be altered by nongenetic factors (for insta
What is fixism? The Fixism is the theory about the diversity of life on earth that affirms that the current existent species were identical to species of the past and came out
ORIGIN (1) From Pro plastid (2) Division (3) Endosymbiotic origin from a cyanobacterium
Assume that you have 1M stock solutions of NaCl, KCl, and CaCl2. If the ion concentrations in human plasma are 120 mM Na+, 12mM K+, and 2 mM Ca+, compute the volumes of the stock s
Facilitation Model - Models of Succession This is considered as the classical model of succession. It is based on the assumption that species of a previous stage are replaced
In the living condition (found in sea) you would be able to observe the following features in radiolarians: The cytoplasm is divided by a perforated and chitinous metnbrane into
Q. Can you explain Bacillus Cereus Poisoning? Ans. Bacillus cereus poisoning is caused by the organism which is a large (3-5 pm long .and 1-4 pm wide), gram po%tive,
Gibberellins in plant growth Gibberellins were first isolated from the culture of a fungus Gibberella fujikuori. Gibberellins has a significant effect on stem elongation
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