Author Topic: IGCSE BIOLOGY DOUBTS HERE !!!!  (Read 30878 times)

Offline The Golden Girl =D

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #60 on: January 03, 2011, 12:50:49 pm »
this is mitosis , and hence it's not asexual .

describe the one which is not asexual *I forgot ,srry *
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Offline WARRIOR

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #61 on: January 03, 2011, 01:34:15 pm »
Enzymes in the food industry ? Anyone please  :-[ i have alot of crap in my book which i think is not necessery to learn so can anyone give me a concise short one . thx
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Offline The Golden Girl =D

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« Last Edit: January 03, 2011, 01:46:27 pm by ~ The Golden Girl ~ »
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline WARRIOR

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #63 on: January 03, 2011, 01:47:55 pm »
I hope these help ;

http://wenku.baidu.com/view/7d19506527d3240c8447ef68.html

http://answers.yahoo.com/question/index?qid=20080123022356AAiisjm

http://www.clickbiology.com/igcse-enzymes-worksheets-cambridge/

=]
the igcse tips will be very useful but i wanted pure igcse answers not randomly answered question :P like i said i have it in my book already :/

thanks !
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 The Golden Girl =D

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #64 on: January 03, 2011, 01:49:13 pm »
LOL , okay I'll look into it *my notes i meant* iA =]
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline The Golden Girl =D

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #65 on: January 03, 2011, 02:47:36 pm »
Here :

the one about the Yogurt/milk as well as the One about the Dough - Sorry but I just can't seem to find that sheet.

Hope it helped =]
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline WARRIOR

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #66 on: January 03, 2011, 02:53:29 pm »
Here :

the one about the Yogurt/milk as well as the One about the Dough - Sorry but I just can't seem to find that sheet.

Hope it helped =]
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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 Blizz_rb93

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #67 on: March 27, 2011, 08:13:17 pm »
This is from the syllabus so if anyone can help me, please do

- Identify the main regions of the alimentary canal and associated organs including mouth, salivary glands, oesophagus, stomach, small intestine, duodenum and ileum, pancreas, liver, gall bladder, large intestine: colon and rectum, anus

- Describe the functions of the regions of alimentary canal listed above, in relation to ingestion, digestion, absorption, assimilation and egestion of food.

I know the FIRST one but i wrote it cause the second one mentioned listed above so yeah :)


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Amelia

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #68 on: March 28, 2011, 12:22:45 pm »
You have to describe the functions of the regions you identified in part 1 in the digestive system.

 -  Mouth ingests food.

-Salivary glands produce saliva. Saliva is a mixture of water, mucus, salivary amylase (which converts starch to maltose; digestion). Saliva (pH7) moistens and softens food.

 Oesophagus: Its function is to carry food from mouth to stomach by Peristalsis.

-Stomach: Only Protein Digestion occurs here.
- Stores food temporarily
- Stomach muscles churn and mix food (also by peristalsis) with gastric juice to form chyme. Gastric juice contains hydrochloric acid (HCl) and enzymes like pepsin.
-HCl is very acidic (pH2), thus it kills bacteria and other microorganisms, as well as stops the action of salivary amylase.
-Provides acidic medium for gastric enzymes to work. Pepsin converts protein to peptides.

Small Intestine is the main site of digestion of food and absorption of nutrients. Villi lining the small intestine absorbs all nutrients that have been processed throughout the body.

Subdivided into duodenum, and ileum
 In the small intestine, chyme stimulates
1. Pancreas to secrete pancreatic juice
2. Gall bladder to secrete bile
3.Intestinal glands to secrete intestinal juice
Pancreatic and intestinal juice contains many digestive enzymes. Bile does not contain enzymes. Bile emulsifies fats, increasing the surface area for lipase action.

Duodenum
- Starch---->maltose by salivary amylase.
- Protein-----> polypeptides by proteases
-Fats-----> fatty acids + glycerol by lipase.

Ileum
- Maltose---->glucose by maltase
- Polypeptides---->amino acids by protease
-Fats--->fatty acids + glycerol by lipase
- Lactose--->glucose + galactose by lactase
- Sucrose --->glucose + fructose by sucrase

Large Intestine : No digestion takes place here.
Absorbs water and mineral salts
Rectum -  temporarily stores faeces
Anus - egests (= removal of undigested matter) faeces


Gall bladder
- Temporarily storesbile(smelly green substance) secreted by liver.
- Secretes bile in the presence of chyme.
- Bile breaks up large fat droplets into very small fat droplets to increase surface area for lipase action (Emulsification)

Pancreas
-Connects to small intestine by pancreatic duct
- Produces pancreatic juice
- Secreteshormones likeinsulin (controls blood glucose concentration) and glucagon
(controls carbohydrate metabolism)

Liver: Produces bile, which is stored in the gall bladder. Deamination of excess Amino acids.

The body cells then uses the digested nutrients to make new materials during assimilation.




I hope you get the idea now. :)

  



« Last Edit: March 28, 2011, 12:25:19 pm by Amelia »

Offline Blizz_rb93

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #69 on: April 07, 2011, 01:20:34 pm »
Can someone please help me with this worksheet??

Thank you =)

Offline Blizz_rb93

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #70 on: April 20, 2011, 05:03:37 pm »
This is in the syllabus but i'm not sure of it.
Describe the growth of the pollen tube and it's entry into the ovule followed by fertilisation ?

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Offline YogiBeAr

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #71 on: April 28, 2011, 11:42:39 am »
hey
Describe the differences between sexual and asexual reproduction
thanks

Offline Aadeez || Zafar

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #72 on: April 28, 2011, 02:14:02 pm »
hey
Describe the differences between sexual and asexual reproduction
thanks

SEXUAL

 - two parents needed
 - gametes formed by meosis
 - zygote is formed in this
 - heriditerical data of Zygote/daughter cell not exactly same as their parents (GENOTYPE and PHENOTYPE of     offsprings r differnt from there parent)
 - chances of variation


ASEXUAL

 - only one parent nedde
 - no gametes formed
 - daughter cell caryy the same information which the parent cell have
 - reproduce mittically
 - no chance of variation during reproduction



Yeh BaaabuRaao ka style hein!

Offline YogiBeAr

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #73 on: April 28, 2011, 02:44:45 pm »
thank you :)
   
i have another question  ???
industrial fermenter and explain the need to provide
suitable conditions in the fermenter, including aseptic precautions, nutrients, optimum
temperature and pH, oxygenation and agitation, for the growth of microorganisms
 i cant seem to find any info of this in my book. i have a little but not enough a (paragraph), it just goes of the subject an rabbles on a load irrelevant stuff :o
thanks for the help :)

Amelia

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Re: IGCSE BIOLOGY DOUBTS HERE !!!!
« Reply #74 on: April 28, 2011, 07:31:31 pm »
thank you :)
   
i have another question  ???
industrial fermenter and explain the need to provide
suitable conditions in the fermenter, including aseptic precautions, nutrients, optimum
temperature and pH, oxygenation and agitation, for the growth of microorganisms
 i cant seem to find any info of this in my book. i have a little but not enough a (paragraph), it just goes of the subject an rabbles on a load irrelevant stuff :o
thanks for the help :)

I have attached the presentation.