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Explain the Bohr's model?
Bohr's Model : Electrons move around the nucleus at tremendous speeds and occupy most of the space in an atom. The exact position or location of an electron at any given moment can only be predicted on the basis of probability. In a widely accepted model of the atom originally proposed by Neils Bohr, electrons move in spherical spaces called orbitals, or shells, which correspond to different energy levels. Electrons are distributed according to their energy levels, with the higher energy electrons residing in the outer shells. The innermost shell contains only 2 electrons. In common elements, the next outer shells contain 8 electrons each.
Atoms either gain, lose, or share electrons in the outer shells. Because the outer shells of many atoms are incomplete, most atoms will interact with other atoms during chemical reactions to achieve stable outer shells. The number of electrons that an atom must either gain, lose, or share to complete the outer shell is known as its valence, or oxidation number. For example, carbon has six electrons, two in its first energy level and four in the outer level. Thus, it can form a stable outer shell by gaining, losing, or sharing four electrons to complete its outer shell when it joins, or bonds, with another atom or atoms to form a compound. The following table lists the oxidation numbers of some important ions frequently used in Biology.
Explain the Competitive behaviour of social animal group dominance behaviours removal of individuals to other groups which minimises inbreeding eg lions, apes.
Give an example of how two organisms are interdependent. Animals generate carbon dioxide and water, which is required by plants. Accept all reasonable answers.
Enumerate the Failures in adaptation Failures in adaptation, such as poor school performance or unsatisfactory peer relationships are usually problems that bring children to th
Q How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs? The echinoderm skeleton is int
How does the interaction between a carrier protein and the substance it transports resemble the interaction among an enzyme and its substrate? Both include the binding of a spe
Are there living beings without cells? Viruses are measured the only living beings that do not have cells. Viruses are constitute by genetic material (DNA or RNA) enwrapped by
Nutrient Absorption Except for carbon, oxygen and hydrogen which are provided by CO 2 and water, all the other elements essential for plants are provided by the soil. Hence,
Hepaticae (Liverworts) The gametophyte is thalloid body or simple stem and leaves, with aquatic or semi-terrestrial habit. Rhizoids are multiceillular. Some examples : Mar
What is the mechanism by which gap junctions could relay signals from G protein coupled receptors between cells within a tissue?
what steps can you take in order to assess why your cattle are not drinking enough water
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