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  1. H

    A level Biology: Post your doubts here!

    in describing function of endosperm....ms says it produces cellulose for cell wall production and protien for growth of plant....bt wasnt endosperm just a starch reserve?
  2. H

    A level Biology: Post your doubts here!

    http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_w08_qp_4.pdf Q7 last part why urea more conc. in urine than in filtrate??? plx explain....i want to test my concept
  3. H

    Chemistry: Post your doubts here!

    lolx
  4. H

    Physics: Post your doubts here!

    how the image is formed in MRI.....I HAVE READ IT MULTIPLE TIMES BT I NEVER SOME TO UNDERSTAND HOW THESE protons cud every make an image.....i cnt get the basic idea.....
  5. H

    A level Biology: Post your doubts here!

    can someone explain SYMPATRIC speciation
  6. H

    A level Biology: Post your doubts here!

    i have difficulty interpreting thie proper ways log scale....whats th
  7. H

    A level Biology: Post your doubts here!

    .when making antibodies using hybridomA method.....we test for the cells producing antibody>>>but i dont understand why we r doing this when we have got hybridoma cells since .....alll the cells should be producing antibodies? is it because not all the cells wud have fused to form hybridoma cell??
  8. H

    A level Biology: Post your doubts here!

    example.....u performed a cross and ratio of one trait to other is 3:1......so if total number is 100 then expected number wud be 75 for one trait and 25 for the other one....its just based on the percentage obtained after doing a genetic cross
  9. H

    Physics: Post your doubts here!

    yea.....there is one question tilll now in paper 4 and 2 in paper 5 for which u need to understand wat i wrote above
  10. H

    A2 Biology | Post your doubts here

    Explain how the structure of the leaves of maize plants enables them to photosynthesise more effectively at high temperatures than wheat plants. ms of this question says plasmodesmata between bundle sheath cells and mesophyll cells relevant comment on stomata what these two points have to do...
  11. H

    Physics: Post your doubts here!

    a current is passed through that piece of semiconductor.......it is placed perpendicularly to the unknown magnetic field....this field causes a bill force on positive charges and electrons so they collect on opposite sides giving rise to a p.d .....this is measured by the voltmeter as hall...
  12. H

    Physics: Post your doubts here!

    AND we DO Not have the picture for spectrum of FM in any of our books.....
  13. H

    Physics: Post your doubts here!

    i quote from the book:"The frequency spectrum of a frequency-modulated (FM) carrier wave is more complex. In particular, there are often more than two sideband frequencies for each signal frequency."
  14. H

    A2 Biology | Post your doubts here

    can somebody tell me the idea of polygenes and why is it that environment has more effect on polygenes
  15. H

    Physics: Post your doubts here!

    how will i determine the frequency of unmodulated carrier wave
  16. H

    Physics: Post your doubts here!

    see Kr has half life of 3 s.....there are two ways....one that u can set up an equation but thats more error prone so better off stick with the second method.........that after 1st 3 s Kr wd be 1/2.....after another 3 s it wud be 1/4th ......and after another 3 it wud be 1/8th whereas because of...
  17. H

    A2 Biology | Post your doubts here

    what has biodiversity to do with nutrient cycling and climate stability
  18. H

    A2 Biology | Post your doubts here

    what are disadvantages of captive breeding programmes If the captive breeding population is too small, inbreeding may occur due to reduced gene pool, which may lead to the population lacking immunity to diseases and other problems Impacts of captive breeding include behavioral problems in...
  19. H

    A2 Biology | Post your doubts here

    brother one more question......in THE ms of question why its i important to mantain biodiversity:MS alwas mentions ecological role I.E nutrient cycling and climate stability.......but i do not understand how this climate stability and nutrient cycling is acheived
  20. H

    Chemistry / biology /physics applications

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