Biology Paper 52

[zarasattar]

How did it go guys?
we should start discussion after 24 hours are over.

 

[zarasattar]

I thought it was easier compared to previous years. It was pretty short too.

 

[thunderingthunder]

I thought it was easier compared to previous years. It was pretty short too.

Question 1 was very tricky...Q2 rocked

 

[hassam]

yea @ question 1......well my cnfusions...cuud we groq out a whole plant from seed and cut sections from its root to make slide???.....and if not y cos it says embryo plant cells not EMBRYO CELLS........
well in the table evidence part that why we cnt successfully breed a cross b hybrid...i wrote all the chromosome no. in zygot of a cross c hybride will be 26...13 complete sets,...so chromosomes cn pair up during prophase 1....bt this cnt occur wid a crooss b bhybrid cos there gametes have different chrmoosome so hybrid after fertilisation myt have an odd no. of chromosome so not all chromosonmes cn pair up........BT problem is i am UNSURE ABT EVEN ODD THING..........i shudnt have mentioned this.........shud it affect my mark or they will not mark it and see rest of my anser....i mean they lll not penalise this

 

[hassam]

wellll........i believe i am correct abt odd even thing.........bt it isnt necessary polant cn have even no. and yet cnt breed cos of not equal no. of sets of chromosomes

 

[hassam]

wat wud be gt ...i guess 22......my expectation is 24-25v for my own marks...........do u think it cn go as high as 25??

 

[zarasattar]

yea @ question 1......well my cnfusions...cuud we groq out a whole plant from seed and cut sections from its root to make slide???.....and if not y cos it says embryo plant cells not EMBRYO CELLS........
well in the table evidence part that why we cnt successfully breed a cross b hybrid...i wrote all the chromosome no. in zygot of a cross c hybride will be 26...13 complete sets,...so chromosomes cn pair up during prophase 1....bt this cnt occur wid a crooss b bhybrid cos there gametes have different chrmoosome so hybrid after fertilisation myt have an odd no. of chromosome so not all chromosonmes cn pair up........BT problem is i am UNSURE ABT EVEN ODD THING..........i shudnt have mentioned this.........shud it affect my mark or they will not mark it and see rest of my anser....i mean they lll not penalise this

i just wrote cut out sections from region of the embryo.. what were the chromosome no.s for the female gamete of hybrids? i wrote 8 and 13..
i wrote about odd and even too.. should be right..

 

[zarasattar]

wat wud be gt ...i guess 22......my expectation is 24-25v for my own marks...........do u think it cn go as high as 25??

nope, i think it'll be around 21-23

 

[zarasattar]

what was the value for the relative difference that we had to calculate from the graph? i got 3..

 

[krazer36]

what was the value for the relative difference that we had to calculate from the graph? i got 3..

I got 2.71 i confirmed by finding the answer for the above values first.

 

[hassam]

welll.....cud we grow out plant