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3 years ago

Which of the following elements are good insulators?

Biology

2 answers:

Flauer [41]3 years ago

5 0

Answer:

P and S

Explanation:

Phosphorus (P) and sulfur (S) both are non-metals. Non-metals are good insulators i.e. they do not let electricity/current pass through them. The reason why non-metals are insulators is because they do not have free electrons in contrast to metals which have free electrons because of which they are good conductors of electricity.

Metals like Li (lithium), Ca (calcium), Ag (silver) and Au (gold) are conductors not insulators. Uranium (U) and thorium (Th) are radioactive but still they are metallic elements so they are not insulators.

So only option 3rd is right.

Rudik [331]3 years ago

3 0

I think it is Ag and Au but not two sure

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2 years ago

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sukhopar [10]

Answer:

B) 1 black eyes, green skin, two eyes : 1 black eyes, green skin, one eye : 1 black eyes, white skin, two eyes : 1 orange eyes, green skin, two eyes : 1 orange eyes, white skin, two eyes : 1 orange eyes, white skin, one eye

Explanation:

Parentals: BbGgCc x bbggcc

The punette square diagram of the cross of these two parents is attached.

B = black eyes, b = orange eyes;

G = green skin, g = white skin;

C = two eyes, c = one eye

Progeny with BbGgCc genotype → black eyes, green skin, two eyes = 8

Progeny with BbGgcc genotype → black eyes, green skin, one eye = 8

Progeny with BbggCc genotype → black eyes, white skin, two eyes = 8

Progeny with bbGgCc genotype → orange eyes, green skin, two eyes = 8

Progeny with Bbggcc genotype → black eyes, white skin, one eye = 8

Progeny with bbGgcc genotype → orange eyes, green skin, one eye = 8

Progeny with bbggCc genotype → orange eyes, white skin, two eyes = 8

Progeny with bbggcc genotype → orange eyes, white skin, one eye = 8

So, if we will see them in the form of ratio then each of the genotype will be in the ratio of 1 i.e. black eyes, green skin, two eyes: black eyes, green skin, one eye: black eyes, white skin, two eyes: orange eyes, green skin, two eyes: black eyes, white skin, one eye: orange eyes, green skin, one eye: orange eyes, white skin, two eyes : orange eyes, white skin, one eye = 1:1:1:1:1:1:1:1.

So, in view of above option B is most appropriate.

Note: In a trihybrid cross, a total of 64 progeny types may be produced.

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