Biology; Chemistry; Physics: Post your doubts here!

[funky brat]

loll hahahahaaha... how can it be B? mosquito lay eggs in water..

Understand the question, they are even attracted to warmth and CO2. Ever seen mosquitos in winter. They just roam around in summers.

 

[Laibaaa]

Mark scheme says B

 

[funky brat]

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can somebody plz eplain this question from part e onwards ...

Pura solve karna parey ga. Wait.

 

[Awesome12]

loll hahahahaaha... how can it be B? mosquito lay eggs in water..

We, my friend, live in pakistan and are more than experienced in matters relating to mosquitoes

 

[kirann]

you wont get any such results.
they ask you for best titration results only for the purpose of calculating average volume, and in this case, avereage would definitely be 23.5

ur so smart mama would be proud of u thanks

 

[♣♠ Magnanimous ♣♠]

We, my friend, live in pakistan and are more than experienced in matters relating to mosquitoes

lol... is it really true... today i got that.

 

[asadalam]

Nowhere. I made it up.

So there might be some error in your question.Going by your idea,i say that place some germinating seeds in a tube over a guaze with soda lime beneath it to absorb co2.Attach a tube with a bubble as the miniscus.As the seeds respire they use up the o2 present in the tube and bubble moves to the right side.We can repeat this experiment with a substance to absorb O2 and show that no change in bubble level is seen.thus seeds use 02 to respire.

 

[funky brat]

Some one please explain this to me. Havent done this chapter at all.

Well okay see vector means carrier, a vector is likely to be most adapted at carrying the pathogen to transmit the disease.
So, laying eggs in water makes no sense because wherever it lay eggs, this has nothing to do with the transmission of disease. They might be living in nests.
Remember what makes mosquito a good carrier of plasmodium:
It's salivary glands (stores plasmodium before transmitting)
It's stomach (site of reproduction)
It's wings. (fly host to host)

 

[♣♠ Magnanimous ♣♠]

Understand the question, they are even attracted to warmth and CO2. Ever seen mosquitos in winter. They just roam around in summers.

yeah..

 

[funky brat]

So there might be some error in your question.Going by your idea,i say that place some germinating seeds in a tube over a guaze with soda lime beneath it to absorb co2.Attach a tube with a bubble as the miniscus.As the seeds respire they use up the o2 present in the tube and bubble moves to the right side.We can repeat this experiment with a substance to absorb O2 and show that no change in bubble level is seen.thus seeds use 02 to respire.

Correct experiment but wrong explanation.
The question is perfectly right.

 

[Laibaaa]

Well okay see vector means carrier, a vector is likely to be most adapted at carrying the pathogen to transmit the disease.
So, laying eggs in water makes no sense because wherever it lay eggs, this has nothing to do with the transmission of disease. They might be living in nests.
Remember what makes mosquito a good carrier of plasmodium:
It's salivary glands (stores plasmodium before transmitting)
It's stomach (site of reproduction)
It's wings. (fly host to host)

Thank you so much, got it.

 

[funky brat]

Thank you so much, got it.

Good ho gya.

 

[asadalam]

Correct experiment but wrong explanation.
The question is perfectly right.

So whats the right explanation

 

[Laibaaa]

Good ho gya.

Hows your preparation going?
Yar aap jaise log kaise itney genius hote ho.

 

[Laibaaa]

Good ho gya.

Hows your preparation going?
Yar aap jaise log kaise itney genius hote ho.

 

[***amd***]

Set up an experiment using respirometer to show that oxygen is used up during respitarion.

FIRST PART OF EXPERIMENT
Blow the air in the test tube with the help of a blowing-pump. This is the air you inhale.
When the water will be displaced down and air will come in contact with potassium, it will burn using the OXYGEN gas present in air. The water level will rise.
Measure this rise in water level, 'A'
SECOND PART OF EXPERIMENT
(Set up the same apparatus and) Blow the air in the test tube with your mouth. This is your exhaled air.
Potassium will burn again when it comes in contact with air, using the OXYGEN, and the water level will rise.
Measure this rise in water level, 'B'.

We will observe that A > B because inhaling air contains more oxygen.

HEY! WAIT! ISNT IT THAT POTASSIUM BURNS IN WATER TOO? IF IT IS, THEN I GUESS WE SHOULD USE OIL INSTEAD OF WATER

 

[Awesome12]

Immerse a pipette in water, making sure it contains no water. Take a flask cotaning a living cockroach and KOH. Attach the pipette to the flask and immerse in water. Soon water will enter pipette. The cockroach will use the O2, respiring to produce CO2, that reacts with the KOH to form K2CO3, which is a whiye solid

 

[kirann]

Pura solve karna parey ga. Wait.

solved?

 

[funky brat]

solved?

Ops 5 minutes please.

 

[kirann]

what would be the second intersecting line to plot on graph other than rise in temperature? weird question