Biology; Chemistry; Physics: Post your doubts here!

[Spidey21]

luckywang....for that lets hit www.google.com

 

[asd]

http://en.wikipedia.org/wiki/Etiolation

Spidey21 The question in our atp was related to a specific type of leaves, so light had different effects on it. If i'm not wrong...

 

[Spidey21]

Spidey21 The question in our atp was related to a specific type of leaves, so light had different effects on it. If i'm not wrong...

you are not wrong.
light had different effect but before going to google let me ask you a few question(s)

1.How does the plant get its green colour
2.Which plant would produce more chloroplast and why (light and dark are being discussed)

 

[asd]

you are not wrong.
light had different effect but before going to google let me ask you a few question(s)

1.How does the plant get its green colour
2.Which plant would produce more chloroplast and why (light and dark are being discussed)

green colour due to chlorophyll in chloroplasts. Chlorophyll actually reflects the green light in the spectrum (vibgyor) to get its characteristic colour.
Plants in light will have dark colour, means more green light is reflected, and those in dark will have light green colour. IDK about the no. of chloroplasts..

 

[luckywang]

http://en.wikipedia.org/wiki/Etiolation

i'm geting more and more confuse... let go back to the question.... is the question just a normal math question? so answer is A. 0? they separated the seed to half so the total amount is almost the same?

 

[asd]

YES. That's what i did. But the second logic could be that in dark, dark green leaves are least likely to be developed.

 

[luckywang]

green colour due to chlorophyll in chloroplasts. Chlorophyll actually reflects the green light in the spectrum (vibgyor) to get its characteristic colour.
Plants in light will have dark colour, means more green light is reflected, and those in dark will have light green colour. IDK about the no. of chloroplasts..

so leaves in plant have more chloroplast cause more green light is reflected?

 

[luckywang]

YES. That's what i did. But the second logic could be that in dark, dark green leaves are least likely to be developed.

maybe there is other thing in the question... biology wont have a question which need math knowledge to solve it right? maybe we missed out some main parts?

 

[asd]

6 A student added 10.0 cm3
of 0.100 mol/dm3
hydrochloric acid to an excess of zinc. The
volume of hydrogen produced was recorded at intervals until no more gas was produced.
This was experiment P.
The experiment was repeated with a different acid solution, again using an excess of zinc.
This was experiment Q.
The graphs of the two experiments are shown on the grid below.
volume of
hydrogen
/ cm3
time/ s
P
Q
Which acid solution would give the graph for experiment Q?
(a) 10 cm3
of 0.050 mol/dm3
hydrochloric acid
(b) 10 cm3
of 0.200 mol/dm3
hydrochloric acid
(c) 20 cm3
of 0.100 mol/dm3
hydrochloric acid
(d) 20 cm3
of 0.200 mol/dm3
hydrochloric acid


i cannot find anything about powder form in this question?

In this question answer will be B.
because the rate has to be faster, so concentration will be more, and the H2 has to be double, so same volume will be used because we are already using double concentration: No. of moles in Q > 10/1000 * 0.2 = 1/500 (double moles, in P moles are 1/1000)

 

[Talhakhan]

Guys i have just done bio topical 1998-2009 ..... But didn't even touched the book .... What you guys advise what more should i study .....

 

[asd]

maybe there is other thing in the question... biology wont have a question which need math knowledge to solve it right? maybe we missed out some main parts?

That "Some other knowledge" is the SECOND LOGIC i posted !! -__-"

 

[luckywang]

YES. That's what i did. But the second logic could be that in dark, dark green leaves are least likely to be developed.

however, according to my knowledge of natural selection, adapt and evolution.... leaves in dark will produce more chloroplast... maybe im wrong...

 

[asd]

so leaves in plant have more chloroplast cause more green light is reflected?

Leaves in plant have more darker chlorophyll if more green light is reflected.

 

[luckywang]

That "Some other knowledge" is the SECOND LOGIC i posted !! -__-"

where?

 

[asd]

But the second logic could be that in dark, dark green leaves are least likely to be developed.

where?

 

[luckywang]

Leaves in plant have more darker chlorophyll if more green light is reflected.

omg... can someone go to do this experiment and tell us about the no.of chloroplast and no. of chlorophyll in chloroplast?

 

[Spidey21]

omg... can someone go to do this experiment and tell us about the no.of chloroplast and no. of chlorophyll in chloroplast?

dude
the plants in shade will produce MORE chloroplast and thus theyll be greener.. asd

 

[asd]

omg... can someone go to do this experiment and tell us about the no.of chloroplast and no. of chlorophyll in chloroplast?

FORGET ABOUT THE NUMBER OF CHLOROPLASTS!!! GOD! IDK THEIR NUMBER IF THE LEAF IS IN DARK OR IN LIGHT. WHAT I KNOW IS PLANTS ARE GREENER IF CHLOROPHYLLS GET LIGHT. WHEN THEY GET LIGHT THEY ABSORB ALL THE OTHER COLOURS IN THE SPECTRUM, EXCEPT GREEN. WHEN THE DON'T THE GREEN LIGHT IS LESS REFLECTED. SO THE COLOUR OF CHLOROPHYLL GOES PALE GREEN ( LIGHT GREEN/CREAMY OR W.E).

got it?

 

[luckywang]

In this question answer will be B.
because the rate has to be faster, so concentration will be more, and the H2 has to be double, so same volume will be used because we are already using double concentration: No. of moles in Q > 10/1000 * 0.2 = 1/500 (double moles, in P moles are 1/1000)

C is also double the original mole?

 

[ayeshaK]

http://www.xtremepapers.com/papers/...nal O Level/Biology (5090)/5090_w10_qp_21.pdf
Explain Q1 ci)