Question

jisko aata he vo pls pls dono solve kr do

Answer 1

17. Cause of dispersion of white light : Different colours of light bend through different angles with respect to the incident ray as they pass through a prism. Violet light bends the most and red the least. Thus, the each colour emerges along different paths.
Newton passed a ray of light through a glass prism. After refraction, the white light splits into its constituent band of seven colour called spectrum. When he tried to further spilt it by placing a prism, it didn't occur. But when he placed an inverted prism and passed the band of colours through it, he saw white light ray coming from the other side. Thus, he concluded that sunlight is made up of seven colours.


18. (a) The existence of decomposers is essential in a biosphere because they breakdown the complex organic substances and convert them into simpler inorganic substances that can be absorbed by the plants. Thus, decomposers
•replenish the soil naturally.
•helps in removing the biodegradable waste.

(b) In a food chain the energy moves progressively through the various trophic levels. It is no longer available to the previous level (autotrophs) and the energy captured by the autotrophs doesn't go back to the solar input. Hence, the flow of energy is indirectional.