Author Topic: IGCSE BIOLOGY DOUBTS HERE !!!!  (Read 31379 times)

Offline Amii

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #45 on: December 29, 2010, 05:58:49 pm »
alright cheers thx for ur time

lol thx gg ! i understood it
Not a problem  :D

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Offline The Golden Girl =D

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #46 on: December 29, 2010, 06:03:11 pm »
Anytime ;)
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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #47 on: January 02, 2011, 03:22:13 pm »
describe how fertilisation in a human differs from that in a flower

thx in advanced
DESCRIBE THE PROCESS OF ASEXUAL REPRODUCTION IN POTATO PLANTS
potatoes can also reproduce sexually forming seeds.Discuss the advantages to potato plants of asexual & sexual reproducion
« Last Edit: January 02, 2011, 03:33:31 pm by Kimo Jesus »
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Offline Amii

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #48 on: January 02, 2011, 04:22:04 pm »
DESCRIBE THE PROCESS OF ASEXUAL REPRODUCTION IN POTATO PLANTS

Potatoes are stem tubers.The parent plant photosunthesises and stores the food produced in underground stems called rhizomes,which swell to form tubers.Each tuber contains stored starch,and there are buds in depressions in the surface known as eyes.In suitable conditions the buds use the stored food to form shoots,from which roots also develop.Each tuber can form a new plant.

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #49 on: January 02, 2011, 04:24:29 pm »
DESCRIBE THE PROCESS OF ASEXUAL REPRODUCTION IN POTATO PLANTS

Potatoes are stem tubers.The parent plant photosunthesises and stores the food produced in underground stems called rhizomes,which swell to form tubers.Each tuber contains stored starch,and there are buds in depressions in the surface known as eyes.In suitable conditions the buds use the stored food to form shoots,from which roots also develop.Each tuber can form a new plant.
THANK YOU :) +REP

THE OTHER QUESTION IS STILL ALIVE AND WAITING TO BE ANSWERED

potatoes can also reproduce sexually forming seeds.Discuss the advantages to potato plants of asexual & sexual reproducion
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline Amii

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #50 on: January 02, 2011, 04:44:41 pm »
No problem sis  :D

Advantages To Asexual Reproduction-
- There is no dispersal in vegatative propogation,hence offspring will grow in the same favourable environemnt as the parent.

-They store large amounts of food that allow rapid growth when conditions are suitable.

Disadvantages To Asexual Reproduction-
-Lack of dispersal in potato tubers can lead to competitions for nutrients,water and light,and will consequently cause the plant to be less healthy.

-There is little variation creted so adaptation to changing environment is unlikely.

-If the parent potato plant has no resistance to a particular disease,none of the offspring will have resistance.

Advantages To Sexual Reproduction-
-There is variation in the offspring so adaptation to the changing or new environment  is likely,enabling survival of the species.

-New varieties can be created, which may have resistance to disease.

-In plants, seeds are produced, which allow dispersal away from the plant, reducing competition.


Disadavantages-

-Two parents are usually needed(though not always- some plants can self-pollinate)

-Growth of a new plant to maturity frm a seed is slow.


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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #51 on: January 02, 2011, 05:07:41 pm »
No problem sis  :D

Advantages To Asexual Reproduction-
- There is no dispersal in vegatative propogation,hence offspring will grow in the same favourable environemnt as the parent.

-They store large amounts of food that allow rapid growth when conditions are suitable.

Disadvantages To Asexual Reproduction-
-Lack of dispersal in potato tubers can lead to competitions for nutrients,water and light,and will consequently cause the plant to be less healthy.

-There is little variation creted so adaptation to changing environment is unlikely.

-If the parent potato plant has no resistance to a particular disease,none of the offspring will have resistance.

Advantages To Sexual Reproduction-
-There is variation in the offspring so adaptation to the changing or new environment  is likely,enabling survival of the species.

-New varieties can be created, which may have resistance to disease.

-In plants, seeds are produced, which allow dispersal away from the plant, reducing competition.


Disadavantages-

-Two parents are usually needed(though not always- some plants can self-pollinate)

-Growth of a new plant to maturity frm a seed is slow.



cheeeeeeeeeers  ;D


ps:im a guy :P


thx again ::)
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline Amii

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #52 on: January 02, 2011, 05:09:36 pm »
cheeeeeeeeeers  ;D


ps:im a guy :P


thx again ::)
Oops  :-[ hehe Sorry  :D
No problem bro  ;) 

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #53 on: January 03, 2011, 08:17:32 am »
guys is there anything i should kno about graphs in biology? is there anything unique about them? i kno that  you have to match points to each other and not make a straight line what else?
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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #54 on: January 03, 2011, 08:23:21 am »
you should know whe to draw a line , when to draw bars  and histograms  , other than that I guess , that's all .
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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #55 on: January 03, 2011, 08:31:07 am »
is there any specific way to know how to put which one as x axis and y axis? or use common sense?
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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #56 on: January 03, 2011, 09:57:38 am »
ANOTHER QUESTION

SEE ATTACHED


THX
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #57 on: January 03, 2011, 12:00:07 pm »
is there any specific way to know how to put which one as x axis and y axis? or use common sense?

hmm a line when they tell u best fitted -that'll mostly be for straight lines

histogram/bars for comparison
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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #58 on: January 03, 2011, 12:05:16 pm »
here.
Verily, in the remembrance of Allah do hearts find rest(13:28)

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #59 on: January 03, 2011, 12:10:43 pm »
here.

i se thanks + rep


what about question no. 2 in the same attachement?
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa