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Q. Generally how does a male animal realize that the female is receptive to copulation?
In most vertebrate species with internal fecundation the females have reproductive cycles with fertile periods during this period the female secretes pheromones odoriferous substances that attract the male of the species from the mucosae and skin. The presence of the male individual and his pheromones as well stimulates the release of pheromones by the female. Many animals also use pheromones for signal transmission and for territorial demarcation between individuals about the location of dangers and food.
Define Simple, Compound, Derived Lipids? Simple lipids are fatty acid esters of glycerol, called triacyglycerols or triglycerides (for e.g. fats and oils) or higher alcohols (
To show the respiration of a plant Place the plant in a test tube held in a weighted wooden block. Put this in a bowl having lime water and cover the plant with a jar. Keep the
You ran both a body temperature and room temperature test for each enzyme you tested. Did the two temperatures seem to have an effect on the enzyme Exercise? Why or why not?
What is the Senses explain their Vision ? Vision : The human eye consists of structures which evolved together to focus light on a sensitive area called the retina. Light f
Palaeobiology : This deals with the study of fossils and remains an impressions of the past organisms found in the rock of different ages. Paleobiology is a growing or comparativel
Marine Animals The composition of body fluids of marine invertebrates, including the ascidians are similar to seawater. Such animals need not expend much energy in regulating
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Which one of the following statements about morula in humans is correct? 1. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA 2. It has far l
What is the effect of physical activity on health? The Surgeon General's report (1996) summarizes the effects of physical activity on health as follows. Overall Mortality: H
Explain periodontal ligament The absence of the periodontal ligament and the presence of osseointegration instead of the gomphosis joint leads to the difference in movement un
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