A level Biology: Post your doubts here!

[RoOkaYya G]

Hello everybody. I have been confused by the following question for a long time...Please help
The answer for this question is D.
But why can't C be right? I thought that stomata are open because of guard cells but not transpiration.
View attachment 49685

stomata is the opening (the hole) ....guard cells(the inner wall) contract n expand so tht stomata is open or close

loss of water potential maintains the water potential yes but in some conditions only..it maintains it only whn theres a net movement....like theres an excess of water vapour..so its being loss to maintain the correct proportion....but here best answer is D....thts the main reason....so its D

 

[Hanona]

Hello everybody. I have been confused by the following question for a long time...Please help
The answer for this question is D.
But why can't C be right? I thought that stomata are open because of guard cells but not transpiration.
View attachment 49685

transpiration does not maintain the water potential, as even in very hot weather a lot of water is lost by transpiration and it does not stop to maintain it..... water vapour is lost from stomata and when stomata is kept open carbon dioxide is allowed to enter more efficiently which is an advantage for gas exchange

 

[slisjunknown]

Which organelles contain Nucleic acids among the following?
Nucleoli, Golgi Apparatus, Ribosomes, Lysosomes,Mitochondrion and Chloroplasts...pls give me an explanation as to why each of the organelles contain or doesnt contain Nucleic Acid

 

[♣♠ Magnanimous ♣♠]

Which organelles contain Nucleic acids among the following?
Nucleoli, Golgi Apparatus, Ribosomes, Lysosomes,Mitochondrion and Chloroplasts...pls give me an explanation as to why each of the organelles contain or doesnt contain Nucleic Acid

Of course Nucleoli contains nucleic acids coz it is present in nucleus of the cell.

 

[♣♠ Magnanimous ♣♠]

Which organelles contain Nucleic acids among the following?
Nucleoli, Golgi Apparatus, Ribosomes, Lysosomes,Mitochondrion and Chloroplasts...pls give me an explanation as to why each of the organelles contain or doesnt contain Nucleic Acid

Nucleus contains nucleic acids DNA and that all coz it controls activities of the whole cell

 

[♣♠ Magnanimous ♣♠]

RoOkaYya G My Name or anyone why answer is not kreb cycle?

 

[My Name]

sorry idk

View attachment 49754 RoOkaYya G My Name or anyone why answer is not kreb cycle?

 

[♣♠ Magnanimous ♣♠]

sorry idk

ok
Oops it's ok A level I forgot... in CBSE it's of 11 so..
wbu RoOkaYya G why answer is d and not c. Kreb cycle produces most ATP but here answer is d why?

 

[RoOkaYya G]

ok
Oops it's ok A level I forgot... in CBSE it's of 11 so..
wbu RoOkaYya G why answer is d and not c. Kreb cycle produces most ATP but here answer is d why?

chemiosis is most.

 

[♣♠ Magnanimous ♣♠]

how

chemiosis is most.

wo kitni ATP banata hai?

 

[RoOkaYya G]

how


wo kitni ATP banata hai?

i dunno exactly but chemiosis occurs mostly throughout the body...like it happens in bulk..so overall ATP is much

 

[DarkEclipse]

Which organelles contain Nucleic acids among the following?
Nucleoli, Golgi Apparatus, Ribosomes, Lysosomes,Mitochondrion and Chloroplasts...pls give me an explanation as to why each of the organelles contain or doesnt contain Nucleic Acid

The Nucleoli, Ribosomes, Mitochondrion and Chloroplasts contain Nucleic Acids.
Reasons:

1. The nucleolus is made up of DNA (Deoxyribonucleic acid)
2. Ribosomes are made of rRNA (ribosomal Ribonucleic acid)
3. Mitochondria have their own DNA
4. Chloroplasts have their own DNA

 

[DarkEclipse]

View attachment 49754 RoOkaYya G My Name or anyone why answer is not kreb cycle?

Each turn of the Krebs Cycle only produces 1 molecule of ATP, whereas Chemiosmosis produces around 5 ATP molecules, where hypothetically, the NAD molecule carries 3 ATP molecules and the FAD carries 2.

 

[♣♠ Magnanimous ♣♠]

Each turn of the Krebs Cycle only produces 1 molecule of ATP, whereas Chemiosmosis produces around 5 ATP molecules, where hypothetically, the NAD molecule carries 3 ATP molecules and the FAD carries 2.

i dunno exactly but chemiosis occurs mostly throughout the body...like it happens in bulk..so overall ATP is much

Thanks a lot

 

[DarkEclipse]

Thanks a lot

No problem

 

[slisjunknown]

The Nucleoli, Ribosomes, Mitochondrion and Chloroplasts contain Nucleic Acids.
Reasons:

1. The nucleolus is made up of DNA (Deoxyribonucleic acid)
2. Ribosomes are made of rRNA (ribosomal Ribonucleic acid)
3. Mitochondria have their own DNA
4. Chloroplasts have their own DNA

Thanks a billiion....any idea abt the Golgi apparatus

 

[Shada Mohammed]

Guys can anyone explain how the action potential is propagated?
What is the refractory period?
Plus how are synapses linked in the process of learning?
What is the treshold?
What is the absorption and action spectrum?
How we can set up the respirometer and the potometer?

 

[♣♠ Magnanimous ♣♠]

Guys can anyone explain how the action potential is propagated?
What is the refractory period?
Plus how are synapses linked in the process of learning?
What is the treshold?
What is the absorption and action spectrum?
How we can set up the respirometer and the potometer?

For action potential read this some pages ---->

 

[rexsun]

transpiration does not maintain the water potential, as even in very hot weather a lot of water is lost by transpiration and it does not stop to maintain it..... water vapour is lost from stomata and when stomata is kept open carbon dioxide is allowed to enter more efficiently which is an advantage for gas exchange

Thanks Hanona! Great explanation. I now understand, thanks much. Merry Christmas.

 

[DarkEclipse]

Thanks a billiion....any idea abt the Golgi apparatus

Golgi apparatus has no nucleic acids.