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WORKING OF EYE -
Human eye is sensitive to light wavelenght ranging from 380 - 760 nm.
Bees, ants, spiders and gold fish can see uttraviolet light which is invisible to human.
It has 2 functional parts -
1. Focussing part or dioptic -
It consists of conjunctiva, cornea, aquous humour, lens, vitrous humour. They refrect the light rays to bring them on the retina. Maximum refrection is caused by cornea.
2. Receptor part -
It comprises of retina. Here inverted and smaller image is formed.
In man Binocular or steroscpic vision is formed due to position of eyes i.e. close to each other.
In rabbit and other animals except primates monocular or panoramic image is formed.
First Stage of Invagination The large endodermal cells that are remaining in the vegetal plate move laterally towards the centre of the plate and fill the gap in the vegetal
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Explain briefly how the stimulus at the finger produces an impulse in the sensory neurone using the following key words. 1. Energy conversion (linked to receptor) 2. Na+ in 3. Depo
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Q. How can bacteria produce human insulin on an industrial scale? What are the other forms of insulin made available by the pharmaceutical industry? Bacteria don't naturally sy
What are homologous chromosomes? Which are the human cells that do not have homologous chromosomes? Chromosomes have genes (genetic information in the form of nucleotide sequen
The different organs of the gastrointestinal system Mouth or buccal cavity - Teeth 32 Permanent and - Tongue Pharynx Oesophagus Stomach Small Intestine
what are the modes of reproduction?
Asexual
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