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Answers
Answer:
a) as shown in image
b)Dispersion is the separation of white light into different colours according to their wavelengths.
c) Newton passed a beam of white light through two prisms, which were held at such an angle that it split into a spectrum when passing through the first prism and was recomposed, back into white light, by the second prism.
d)rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops.It is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere.When a sunlight enters into a spherical raindrop, it is refracted and dispersed. The different colours of light bend in different angles.When different colours of light fall on the back inner surface of drop, it (water drop) reflects (different colours of light) internally (total internal reflection).The water drops again refracts the different colours, when it comes out from the raindrop.After leaving this different colours from the raindrop as rainbow, reach our eye. Thus, we see a rainbow.
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Answer:
Microsporangia is the structure that is mainly responsible for the production and releases of pollen grains. The thecae acts as the microsporangium. There are four layers found in the microsporangia and the four layers have a different role in the maturation of pollen grain.