AS Biology P1 MCQs Preparation Thread

[Capricedcapri]

GP= NP-R, GP=Gross which is energy produced by plant and NP= energy transferred to primary consumers R= respiration, so 10000 is produced by plant okay which is gross, gross literally means energy converted to chemical energy from light so (1000000-9900000) is 10000 which is light energy absorbed so follow the equation 10000-(all energy lost by respiration) which is 10000-(5000)= 5000 so they are asking percentage of light coverted to net productivity so N.P= 5000 correct so 5000/1000000= 5x10-3 x100 = 0.5% answer is B correct me if im wrong.

Awesum!!....thanks man

 

[Soldier313]

I just wanna make sure before i explain.

yep its C

 

[Soldier313]

geek101 The King XII and Capricedcapri
thanx a lot

 

[Capricedcapri]

geek101 The King XII and Capricedcapri
thanx a lot

Same goes for u....np.....: D

 

[Ashique]

need help_mcq 1 oct/nov paper 2010 varaint 1

In question 1, you mean??
None of the listed organelles are visible under a light microscope with a magnification of x400, except for chloroplasts.

 

[yuuki]

In question 1, you mean??
None of the listed organelles are visible under a light microscope with a magnification of x400, except for chloroplasts.

but why isnt mitochondria visible,shouldnt it be visible too

 

[Soldier313]

but why isnt mitochondria visible,shouldnt it be visible too

nope mitochondria aren't visible, when you view a plant cell through a microscope in xul, u cnt c it

 

[yuuki]

nope mitochondria aren't visible, when you view a plant cell through a microscope in xul, u cnt c it

ok thank you so much

 

[Soldier313]

ok thank you so much

welcome

 

[jrahmed]

Pressure potential always has a positive value. So X is for pressure potential.
Solute potential always has a negative value. That's shown by curve Z.
Y is left. That has to be for water potential.

isnt the ans A??

 

[Soldier313]

isnt the ans A??

its D

 

[Ashique]

but why isnt mitochondria visible,shouldnt it be visible too

Nope, not as far as I know. If you've looked at slides in your school, you'd know the only things you'd see down a plant cell are the nucleus, the chloroplast and probably differentiate between the plasma membrane and the cell wall.

 

[Irfan1995]

Mitochondria are 0.5-1 micrometers long. It CAN be viewed by a light microscope, BUT ONLY at a magnification of x750 or greater, NOT at x400. As everyone else said, chloroplasts are slightly visible, but the nucleus and the vacuoles are completely visible after staining.

 

[Soldier313]

Mitochondria are 0.5-1 micrometers long. It CAN be viewed by a light microscope, BUT ONLY at a magnification of x750 or greater, NOT at x400. As everyone else said, chloroplasts are slightly visible, but the nucleus and the vacuoles are completely visible after staining.

Nope, not as far as I know. If you've looked at slides in your school, you'd know the only things you'd see down a plant cell are the nucleus, the chloroplast and probably differentiate between the plasma membrane and the cell wall.

Hey people could i please urgently get a list of the sizes of all the organelles in a eukaryotic and prokaryotic cells? please help asap if you have this. Jazakallah

 

[Irfan1995]

people the ans fr this is B....i understand the second column, however for the first isn't it water potential increases? I mean isn't that how the hydrostatic pressure is built up..... bcoz of high water potential in sieve tube elements in leaves, which will allow the mass flow to occur?View attachment 12854

The leaf is actively photosynthesizing, so it is producing a lot of glucose. This dissolves immediately in the water which reduces the water potential.

 

[Irfan1995]

Hey people could i please urgently get a list of the sizes of all the organelles in a eukaryotic and prokaryotic cells? please help asap if you have this. Jazakallah

2.5 cm: diameter of aorta​

1.8 cm: diameter of trachea​

1.2 cm: diameter of bronchus​

2 mm: thickness of aorta​

0.01-0.2 mm: diameter of xylem vessels​

250 μm: diameter of alveolus​

200μm: average length of unicellular organism (e.g. Paramecium)​

100 μm: smallest object visible with the eye only​

40 μm: average diameter of plant cell​

20 μm: average diameter of animal cell​

7.5 - 10 μm: diameter of nucleus​

5 -10 μm: minimum length of particles that can be trapped by cilia and mucus​

7 μm: diameter of human capillary/red blood cell​

5 μm: length of chloroplast​

2.5 μm: diameter of nucleolus​

2 μm: minimum length of particles that settle in alveoli​

1-2 μm: width of plant cell wall​

0.5-1 μm: average diameter of mitochondria and bacteria​

200 nm: smallest object visible with light microscope (magnification of 1500x)​

100 nm: length of HIV virus (very large virus)​

30 nm: length of virus​

20 nm: average diameter of ribosome​

7 nm: thickness of membrane​

2 nm: diameter of DNA​

0.5 nm: smallest object visible with electron microscope ​

 

[Soldier313]

2.5 cm: diameter of aorta​

1.8 cm: diameter of trachea​

1.2 cm: diameter of bronchus​

2 mm: thickness of aorta​

0.01-0.2 mm: diameter of xylem vessels​

250 μm: diameter of alveolus​

200μm: average length of unicellular organism (e.g. Paramecium)​

100 μm: smallest object visible with the eye only​

40 μm: average diameter of plant cell​

20 μm: average diameter of animal cell​

7.5 - 10 μm: diameter of nucleus​

5 -10 μm: minimum length of particles that can be trapped by cilia and mucus​

7 μm: diameter of human capillary/red blood cell​

5 μm: length of chloroplast​

2.5 μm: diameter of nucleolus​

2 μm: minimum length of particles that settle in alveoli​

1-2 μm: width of plant cell wall​

0.5-1 μm: average diameter of mitochondria and bacteria​

200 nm: smallest object visible with light microscope (magnification of 1500x)​

100 nm: length of HIV virus (very large virus)​

30 nm: length of virus​

20 nm: average diameter of ribosome​

7 nm: thickness of membrane​

2 nm: diameter of DNA​

0.5 nm: smallest object visible with electron microscope ​

May Allah (SWT) bless you! Thanx so much!

 

[confused123]

got it

2.5 cm: diameter of aorta​

1.8 cm: diameter of trachea​

1.2 cm: diameter of bronchus​

2 mm: thickness of aorta​

0.01-0.2 mm: diameter of xylem vessels​

250 μm: diameter of alveolus​

200μm: average length of unicellular organism (e.g. Paramecium)​

100 μm: smallest object visible with the eye only​

40 μm: average diameter of plant cell​

20 μm: average diameter of animal cell​

7.5 - 10 μm: diameter of nucleus​

5 -10 μm: minimum length of particles that can be trapped by cilia and mucus​

7 μm: diameter of human capillary/red blood cell​

5 μm: length of chloroplast​

2.5 μm: diameter of nucleolus​

2 μm: minimum length of particles that settle in alveoli​

1-2 μm: width of plant cell wall​

0.5-1 μm: average diameter of mitochondria and bacteria​

200 nm: smallest object visible with light microscope (magnification of 1500x)​

100 nm: length of HIV virus (very large virus)​

30 nm: length of virus​

20 nm: average diameter of ribosome​

7 nm: thickness of membrane​

2 nm: diameter of DNA​

0.5 nm: smallest object visible with electron microscope ​

got it wrong. it is so not between 1um and 10 um

 

[Soldier313]

what is the diff btwn centrioles replicating and centrioles moving apart?

 

[Soldier313]

got it

got it wrong. it is so not between 1um and 10 um

what do u mean? where is the error?