Question

13) Water is formed from hydrogen and oxygen.
4M
a. What is the correct chemical formula of water?
b. What is the ratio by mass of hydrogen and oxygen in water?
c. Why is water considered as compound?
d. What is the gaseous form of water?
14) Plasma membrane is called a selectively permeable membrane. Justify
IM
15) What are genes? Where are they located?
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OR
Why is nuclear region in prokaryotes poorly defined?
16) A person suffering from HIV-AIDS cannot fight even minor infections. Why?
IM
OR
Who discovered vaccine for the first time? Name two diseases which can be
prevented by using vaccines.
17) A person met with an accident in which two long bones of the hand were dislocated.
What could be the reason?
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Answer 1

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13 ) True

14) H2O

b) Gaseous form of water is vapour.

15)Genes are found on tiny spaghetti-like structures called chromosomes (say: KRO-moh-somes). And chromosomes are found inside cells. Your body is made of billions of cells. Cells are the very small units that make up all living things.

16)The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. ... It allows hydrophobic molecules and small polar molecules diffuse through the lipid layer, but does not allow ions and large polar molecules cannot diffuse through the membrane.