Biology; Chemistry; Physics: Post your doubts here!

[Nabeel.Ahmad]

Alright. But I've heard that Insights is quite detailed so would that help in anyway in getting an A*?

Well, read Insights too, then.
But Federal has the sufficient information, required by the syllabus, and it covers all topics. So if you had to make a choice, go for Federal.

 

[funky brat]

Well, read Insights too, then.
But Federal has the sufficient information, required by the syllabus, and it covers all topics. So if you had to make a choice, go for Federal.

Thanks.

 

[ZohaKhan]

Presott is also nice

 

[black widow]

How is the answer D?
Shouldn't it be A?

 

[LioxMessi]

How is the answer D?
Shouldn't it be A?
View attachment 35546

PM-ed you the concept with a detailed explanation.

 

[black widow]

PM-ed you the concept with a detailed explanation.

thnx bro

 

[funky brat]

PM-ed you the concept with a detailed explanation.

The correct option is D because the shivering of the muscles occurs only when the surroundings temperature is lower than the core body temperature and evaporation of sweat would remove the latent heat thereby causing a heat loss but isn't it the same phenomenon that occurs in vasodilation? The blood vessels dilate and allow more blood to flow which carries more heat to the skin through which it is passed onto the outside the body so why does not vasodilation cause heat loss? Can you please explain?

 

[black widow]

The correct option is D because the shivering of the muscles occurs only when the surroundings temperature is lower than the core body temperature and evaporation of sweat would remove the latent heat thereby causing a heat loss but isn't it the same phenomenon that occurs in vasodilation? The blood vessels dilate and allow more blood to flow which carries more heat to the skin through which it is passed onto the outside the body so why does not vasodilation cause heat loss? Can you please explain?

If the surrounding temperature would be higher than that of the body, there would be no flow of heat from the body since a ''temperature gradient'' won't exist, so arterioles would not dilate.
credit goes to LioxMessi

 

[black widow]

can diffusion take place if no cell membrane is present?

 

[Nabeel.Ahmad]

can diffusion take place if no cell membrane is present?

Yeah Don't gases diffuse from one place to another, in a room?

 

[black widow]

Yeah Don't gases diffuse from one place to another, in a room?

oh yeah
actually it was related to bio, so i was confused

 

[Nabeel.Ahmad]

oh yeah
actually it was related to bio, so i was confused

Okay.

 

[***amd***]

oh yeah
actually it was related to bio, so i was confused

hota hai xD

 

[black widow]

hota hai xD

oh to ap ya par bi tasreef lata hai

 

[***amd***]

oh to ap ya par bi tasreef lata hai

tum angrezi hi bola karo

 

[black widow]

What is the difference between an allele and gene?
and also DNA and chromosome
cud someone explain each one in detail

 

[black widow]

tum angrezi hi bola karo

 

[***amd***]

when you speak urdu, i m literally like this ""

 

[black widow]

when you speak urdu, i m literally like this ""

y?
i am used to typing fast so i skip alot of words

 

[***amd***]

What is the difference between an allele and gene?
and also DNA and chromosome
cud someone explain each one in detail

no difference b/w allele and a gene, its just this that we use the word "gene" when talking about the *matter* i would say, but allele is used to define an organism's genotype.

DNA is deoxyribonucliec acid, chromosome is made up of DNA