how were bio papers?

[Fallen316]

fr plane one i wrote 1 and 2 plane is it right

no, one and three was correct.

nd what was the ans fr ques in which two plants and snails were given??

food

 

[pakisatan123]

wasnt oxygen correct i confirmed frm a very like bacha

 

[Fallen316]

wasnt oxygen correct i confirmed frm a very like bacha

i did this mcq in a past paper and i marked oxygen but it was wrong

 

[SoulEater]

then it would be the aerobic conditions one.

No i doubt it , it was presence of salt water , aerobic conditions would increase its breakdown no where in the question did it mention the microorganisms can respire an aerobically.

 

[pakisatan123]

so food is confirmed

 

[pakisatan123]

nd what fr that limiting rate of photosynthesis about limiting factor

 

[Fallen316]

so food is confirmed

here is the mcq , check the marking scheme the answer is B
http://www.xtremepapers.com/papers/...onal O Level/Biology (5090)/5090_w06_qp_1.pdf

 

[Fallen316]

nd what fr that limiting rate of photosynthesis about limiting factor

changing it will only increase.

 

[pakisatan123]

last ques fr theory one why leaf limp where as stem nt and change in leaf fr xylem

 

[Rimi]

nd what was the ans fr ques in which two plants and snails were given??

The planes one was 'one and three'
and the snails wala question's answer was 'food'

 

[Rimi]

changing it will only increase.

It was increase and decrease o.o because if you increase the temperature too much, the rate of photosynthesis drops.

 

[Fallen316]

last ques fr theory one why leaf limp where as stem nt and change in leaf fr xylem

stem contains xylem walls contain lignin
xylem are in vascular bundals in stem running like steel reinforcements in concrete pillars
water evaporated from the leaf more than it recieved so it lead to wilting.

 

[pakisatan123]

nd could we write that xylem doesnt has any stomatal pores to loose water

 

[Fallen316]

It was increase and decrease o.o because if you increase the temperature too much, the rate of photosynthesis drops.

see the limiting factor is already decreasing the rate of photosynthesis , if you change it ( lower it further ) it will FURTHER decrease the rate and if you change it ( higher ) then it will increase the rate. the mcq options did not include the word FIRTHER so it was already decreasing the rate and when changed it will only increase.

 

[Rimi]

last ques fr theory one why leaf limp where as stem nt and change in leaf fr xylem

The stem is surrounded by lignin that prevents the stem from limping/collapsing. The leaf however is cut off from water supply from the roots, and is unable to photosynthesise, make food and eventually dies

Young leaves must develop:
1. Lignin to support the vessel
2. Leakage of protoplasm to form a hollow lumen
3. wide lumen with cylindrical shape of the vessel

 

[Fallen316]

nd could we write that xylem doesnt has any stomatal pores to loose water

yup , that could be correct

 

[Rimi]

see the limiting factor is already decreasing the rate of photosynthesis , if you change it ( lower it further ) it will FURTHER decrease the rate and if you change it ( higher ) then it will increase the rate. the mcq options did not include the word FIRTHER so it was already decreasing the rate and when changed it will only increase.

awh damn xD Can't argue logics.

 

[Fallen316]

The stem is surrounded by lignin that prevents the stem from limping/collapsing. The leaf however is cut off from water supply from the roots, and is unable to photosynthesise, make food and eventually dies

Young leaves must develop:
1. Lignin to support the vessel
2. Leakage of protoplasm to form a hollow lumen
3. wide lumen with cylindrical shape of the vessel

i wrote :
1. lignin
2. long/narrow
3. cross walls/circular rings

 

[pakisatan123]

i think u people mis under stood the ques what leaf cell should nt have to become xylem i wrote no cytoplasm no vacuole type things

 

[Fallen316]

i think u people mis under stood the ques what leaf cell should nt have to become xylem i wrote no cytoplasm no vacuole type things

no , the question said, asked about STRUCTURAL featuers