different types of leaves and their names
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Answers:Having broad leaves allows for a greater surface area for photosynthetic pigments to get light. This is typical of shade trees. Having a narrow leaf would allow sub-canopy species more light, so there might be a necessary associated plant. Leaves are simple, compound, pinnately compound, bi-pinnately compound, tri-pinnately compound, trifoliately compound, and palmately compound. They can be opposite, alternate or whorled. Leaf arrangement is one of the simplest ways to divide plants. Blame the Italian, Cesalpino for this complex naming...There are also many different fruit type arrangements, but you asked about leaf arrangement. Leaves vary greatly from species to species. Again, knowing a leaf type and leaf arrangement can help you understand what kind of niche the plant fills and how it feeds itself.
Answers:Any of the organic compounds making up the genetic material of living cells. Nucleic acids direct the course of protein synthesis, thereby regulating all cell activities. Their transmission from one generation to the next is the basis of heredity. The two main types, DNA and RNA, are composed of similar materials but differ in structure and function. Both are long chains of repeating nucleotides. The sequence of purines and pyrimidines (bases)-adenine (A), guanine (G), cytosine (C), and either thymine (T; in DNA) or uracil (U; in RNA)-in the nucleotides, in groups of three (triplets, or codons), constitutes the genetic code.
Answers:This question could mean a lot of things depending on what level of physics you're at. There are a lot more than four possible transitions. Read the wiki and sea if that drawing near the top rings a bell for you: http://en.wikipedia.org/wiki/Phase_transition