Results 1 to 10 of 10

Thread: Biology 'Homeostatis' (Short Questions)Part A

  1. #1
    Emad Hassan's Avatar
    Emad Hassan is offline Senior Member+
    Last Online
    24th September 2011 @ 09:38 PM
    Join Date
    18 Aug 2011
    Location
    Faisalabad
    Age
    27
    Gender
    Male
    Posts
    121
    Threads
    35
    Credits
    0
    Thanked
    15

    Red face Biology 'Homeostatis' (Short Questions)Part A

    Assalam-o-Alaikum

    Mei Ap ke Liye Biology Chapter 1 ke Short Questions le kar aya hon.Umeed hai keh ap ko pasand ayein gy.

    XII Biology – Chapter 1

    Q.1. Why more water is required for the excretion of ammonia.

    Ans. It is highly soluble in water and rapidly diffuse across the plasma membrane. Ammonia is toxic for the organism. Its toxicity is reduced when diluted with large quantities of water due to this reason more water is required for excretion.

    Q.2. Where urea is produces and why ATP is required for the process?

    Ans. Urea is produced in the liver. NH3 combines with CO2 during this process ATP is required. Mammals, amphibians, shark and some bony fishes also excreted urea.

    Q.3. Why water is not required for the excretion of uric acid?

    Ans. It has extremely low solubility in water due to this water is not required for the excretion of uric acid. Formation of uric acid requires ATP.

    Q.4. In which form the uric acid is excretion out of the body?

    Ans. The suspension of uric acid is discharged in the form of thick paste or solid pellets. Uric acid is excreted by insects reptiles and bird.

    Q.5. How much urea is less soluble than ammonia in water?

    Ans. Urea is relatively less soluble in water 100,000 times less toxic than NH3.

    Q.6. Give the route of excretion from the soft bodied animals and fishes?

    Ans. In soft bodied animal ammonia is excreted from the body surface. In fish, most of the ammonia is excreted through gills as ammonium ions.

    Q.7. What are the excretory organs of earthworm?

    Ans. The excretory organs of earthworm are metanephridia which are arranged segmentally.

    Q.8. What is metanephridium?

    Ans. Each metanphridiumus coiled tube which is surrounded by capillaries. One end of metanephridium open in coemolic fluid where as other end opens on body surface through nephridiopore. Waste materials along with water are absorbed from the coemolic fluid passes through coiled part reabsorption of water takes place and remaining part is excreted through nephridiopore to outside the body.

    Q.9. What is liver?

    Ans. Liver is large reddish brown exocrine gland located in abdomen just below the diaphragm. Liver has bladder like gall bladder which stores bile and pour this bile into duodenum by the help of bile duct.

    Q.10. What is the role of the liver for the metabolism of carbohydrates?

    Ans. Liver maintain the level of glucose in blood. If blood contains excess glucose then glucose is stored in liver in the form of glycogen. If blood contains less glucose then stored glycogen is converted in glucose and release in blood. If glycogen is unavailable then liver converts amino acid or lipids into glucose and release in ton blood. Liver also converts lipids into fats and stores it.

    Q.11. What is deamination and in which cycle the ammonia is converted into urea?

    Ans. In liver break down of amino acids takes place. First amino group (NH4) is separated from amino acids and this process is called diamination then CO2 reacts with ammonia in ornithine cycle and converted into urea. This urea is released in blood circulation and excreted through kidneys.

    Q.12. Describe the detoxification role of liver?

    Ans. Liver also neutralizes many toxic substance such as hydrogen peroxide which is produced during metabolism is broken down into H2O and O2 by the help of enzyme catalase.

    Q.13. How gall stones are formed?

    Ans. Liver synthesizes cholesterol in excess amount forms gall stones in gall bladder.

    Q.14. How liver help in the maintenance of body temperature for homeostatis?

    Ans. Due to high metabolic are in liver heat is produced which helps in maintaining body temperature.

    Q.15. For which vitamins the liver act as a reservoir?

    Ans. Liver also stores many vitamins such as A, B and D.

    Q.16. What is ultrafiltration and where it occurs?

    Ans. During this process when blood passes through glomerulous, its plasma filters and diffuses into Bowman’s capsule. Filtration occurs due to high hydrostatic pressure in glomerulous is called ultrafiltration. This filtrate contains all molecules except plasma, proteins and blood cells.

    Q.17. From where the reabsorption of glucose, amino acid, water and salt occur in the nephron?

    Ans. When filtrate passes through proximal convoluted tubule, glucose, amino acids, water and salts are reabsorbed in per tubular network.

    Q.18. Compare the role of ascending and descending limb of henel?

    Ans.

    ASCENDING LIMB OF LOOP OF HENLE

    In ascending limb of loop of Henle active absorption of sodium and chloride ions takes place. Sodium and chloride ions move out from filtrate into interstitial fluid and then taking up by the blood.

    DESCENDING LIMB OF LOOP OF HENLE

    When filtrate passes through descending limbs of loop of Henle reabsorption of water and sodium takes place.

    Q.19. What is the function of distil convoluted tubule of nephron?

    Ans. In distal convoluted tubule concentration of various salts in adjusted under influence of hormones. The filtrate now almost urine and collected in collecting dust.

    Q.20. How many types of counter current mechanism are there?

    Ans. There are two counter current system are operating.

    1. One of the counter current is termed as counter current multiplier loops of Henle.
    2. The other counter current system is consists of those blood vessels which run parallel to loop of Henle and are called Vasa Recta.

    Q.21. How counter current multiplier perform its responsibilities?

    Ans. In counter current multiplier loops of Henle the filtrate passes through descending limbs of loop of Henle, reabsorption of water takes place from filtrate and it becomes hypertonic then the interstitial fluid. In ascending limb of loop of henle, sodium and chloride ions are actively reabsorbed from the filtrate and it becomes hypotonic. Sodium and chloride ions removed from ascending limbs slowly diffuse bact to descending limbs.

    Q.22. What is the role of vasa recta?

    Ans. The outer counter current system is consists of those blood vessels which run parallel to loop of Henle and are called Vasa Recta. The blood supply to vasa recta provides oxygen and nourishments to the tissues of medulla it also takes away water absorbed from the filtrate.

    Q.23. What are the adaptations of kidneys for the conservation of water?

    Ans. Kidneys are adapted for the conservation of water. For this purpose two types of nephrons are found in kidneys. Such as cortical nephrons which have sorter lop of henle where the reabsorption of water is lower and Juxtamedullary nephrons which have longer loop of henle which extend up to medulla. In these nephrons reabsorption of water is higher. If kidney has larger number of Juxtamendullary nephrons there is greater conservation of water.

    Q.24. How many types of nephrons are there?

    Ans. There are two types of nephrons.

    1. Cortical Nephrons: Which have shorter loop of Henle where the reabsorption of water is lower.

    2. Juxtamedullary Nephrons: Which have longer loop of Henle which extend up to medulla. In these nephrons reabsorption of water is higher.

  2. #2
    Join Date
    25 Apr 2010
    Location
    Rawalpindi
    Gender
    Male
    Posts
    88
    Threads
    3
    Credits
    96
    Thanked
    0

    Default

    cooooooooooool

  3. #3
    Nighat pk is offline Senior Member+
    Last Online
    10th July 2018 @ 10:57 PM
    Join Date
    31 May 2011
    Location
    riyadh
    Gender
    Female
    Posts
    51
    Threads
    11
    Credits
    0
    Thanked
    8

    Default

    Thanks!

  4. #4
    Nizamsk's Avatar
    Nizamsk is offline Advance Member
    Last Online
    15th January 2023 @ 08:26 AM
    Join Date
    28 Jan 2013
    Location
    PAKISTAN
    Gender
    Male
    Posts
    4,105
    Threads
    192
    Credits
    1,075
    Thanked
    169

    Default

    Bohat aala mere bhai

  5. #5
    Meena Nawaz's Avatar
    Meena Nawaz is offline Senior Member+
    Last Online
    11th December 2013 @ 07:20 AM
    Join Date
    14 Nov 2011
    Gender
    Female
    Posts
    2,007
    Threads
    95
    Credits
    935
    Thanked
    156

    Default

    thanks

  6. #6
    Avais Raza's Avatar
    Avais Raza is offline Senior Member+
    Last Online
    4th July 2013 @ 10:22 PM
    Join Date
    29 Aug 2012
    Location
    _In Your Heart_
    Gender
    Male
    Posts
    3,205
    Threads
    130
    Credits
    930
    Thanked
    308

    Default

    Good Sharing dear,
    thanksss.

  7. #7
    Alina830 is offline Member
    Last Online
    16th October 2014 @ 10:35 PM
    Join Date
    02 Apr 2013
    Location
    I-I¢ãARTH
    Age
    26
    Gender
    Female
    Posts
    1,706
    Threads
    67
    Thanked
    130

    Default

    gud.....

  8. #8
    SAHER AROOJ is offline Junior Member
    Last Online
    7th March 2014 @ 06:57 PM
    Join Date
    06 Mar 2014
    Location
    wazirabad
    Gender
    Female
    Posts
    3
    Threads
    0
    Credits
    682
    Thanked
    0

    Default

    Boht khoob

  9. #9
    akash gohar's Avatar
    akash gohar is offline Junior Member
    Last Online
    9th June 2014 @ 05:29 PM
    Join Date
    22 Mar 2014
    Location
    multan pk
    Gender
    Male
    Posts
    22
    Threads
    4
    Credits
    0
    Thanked: 1

    Default thank u

    Quote Emad Hassan said: View Post
    Assalam-o-Alaikum

    Mei Ap ke Liye Biology Chapter 1 ke Short Questions le kar aya hon.Umeed hai keh ap ko pasand ayein gy.

    XII Biology – Chapter 1

    Q.1. Why more water is required for the excretion of ammonia.

    Ans. It is highly soluble in water and rapidly diffuse across the plasma membrane. Ammonia is toxic for the organism. Its toxicity is reduced when diluted with large quantities of water due to this reason more water is required for excretion.

    Q.2. Where urea is produces and why ATP is required for the process?

    Ans. Urea is produced in the liver. NH3 combines with CO2 during this process ATP is required. Mammals, amphibians, shark and some bony fishes also excreted urea.

    Q.3. Why water is not required for the excretion of uric acid?

    Ans. It has extremely low solubility in water due to this water is not required for the excretion of uric acid. Formation of uric acid requires ATP.

    Q.4. In which form the uric acid is excretion out of the body?

    Ans. The suspension of uric acid is discharged in the form of thick paste or solid pellets. Uric acid is excreted by insects reptiles and bird.

    Q.5. How much urea is less soluble than ammonia in water?

    Ans. Urea is relatively less soluble in water 100,000 times less toxic than NH3.

    Q.6. Give the route of excretion from the soft bodied animals and fishes?

    Ans. In soft bodied animal ammonia is excreted from the body surface. In fish, most of the ammonia is excreted through gills as ammonium ions.

    Q.7. What are the excretory organs of earthworm?

    Ans. The excretory organs of earthworm are metanephridia which are arranged segmentally.

    Q.8. What is metanephridium?

    Ans. Each metanphridiumus coiled tube which is surrounded by capillaries. One end of metanephridium open in coemolic fluid where as other end opens on body surface through nephridiopore. Waste materials along with water are absorbed from the coemolic fluid passes through coiled part reabsorption of water takes place and remaining part is excreted through nephridiopore to outside the body.

    Q.9. What is liver?

    Ans. Liver is large reddish brown exocrine gland located in abdomen just below the diaphragm. Liver has bladder like gall bladder which stores bile and pour this bile into duodenum by the help of bile duct.

    Q.10. What is the role of the liver for the metabolism of carbohydrates?

    Ans. Liver maintain the level of glucose in blood. If blood contains excess glucose then glucose is stored in liver in the form of glycogen. If blood contains less glucose then stored glycogen is converted in glucose and release in blood. If glycogen is unavailable then liver converts amino acid or lipids into glucose and release in ton blood. Liver also converts lipids into fats and stores it.

    Q.11. What is deamination and in which cycle the ammonia is converted into urea?

    Ans. In liver break down of amino acids takes place. First amino group (NH4) is separated from amino acids and this process is called diamination then CO2 reacts with ammonia in ornithine cycle and converted into urea. This urea is released in blood circulation and excreted through kidneys.

    Q.12. Describe the detoxification role of liver?

    Ans. Liver also neutralizes many toxic substance such as hydrogen peroxide which is produced during metabolism is broken down into H2O and O2 by the help of enzyme catalase.

    Q.13. How gall stones are formed?

    Ans. Liver synthesizes cholesterol in excess amount forms gall stones in gall bladder.

    Q.14. How liver help in the maintenance of body temperature for homeostatis?

    Ans. Due to high metabolic are in liver heat is produced which helps in maintaining body temperature.

    Q.15. For which vitamins the liver act as a reservoir?

    Ans. Liver also stores many vitamins such as A, B and D.

    Q.16. What is ultrafiltration and where it occurs?

    Ans. During this process when blood passes through glomerulous, its plasma filters and diffuses into Bowman’s capsule. Filtration occurs due to high hydrostatic pressure in glomerulous is called ultrafiltration. This filtrate contains all molecules except plasma, proteins and blood cells.

    Q.17. From where the reabsorption of glucose, amino acid, water and salt occur in the nephron?

    Ans. When filtrate passes through proximal convoluted tubule, glucose, amino acids, water and salts are reabsorbed in per tubular network.

    Q.18. Compare the role of ascending and descending limb of henel?

    Ans.

    ASCENDING LIMB OF LOOP OF HENLE

    In ascending limb of loop of Henle active absorption of sodium and chloride ions takes place. Sodium and chloride ions move out from filtrate into interstitial fluid and then taking up by the blood.

    DESCENDING LIMB OF LOOP OF HENLE

    When filtrate passes through descending limbs of loop of Henle reabsorption of water and sodium takes place.

    Q.19. What is the function of distil convoluted tubule of nephron?

    Ans. In distal convoluted tubule concentration of various salts in adjusted under influence of hormones. The filtrate now almost urine and collected in collecting dust.

    Q.20. How many types of counter current mechanism are there?

    Ans. There are two counter current system are operating.

    1. One of the counter current is termed as counter current multiplier loops of Henle.
    2. The other counter current system is consists of those blood vessels which run parallel to loop of Henle and are called Vasa Recta.

    Q.21. How counter current multiplier perform its responsibilities?

    Ans. In counter current multiplier loops of Henle the filtrate passes through descending limbs of loop of Henle, reabsorption of water takes place from filtrate and it becomes hypertonic then the interstitial fluid. In ascending limb of loop of henle, sodium and chloride ions are actively reabsorbed from the filtrate and it becomes hypotonic. Sodium and chloride ions removed from ascending limbs slowly diffuse bact to descending limbs.

    Q.22. What is the role of vasa recta?

    Ans. The outer counter current system is consists of those blood vessels which run parallel to loop of Henle and are called Vasa Recta. The blood supply to vasa recta provides oxygen and nourishments to the tissues of medulla it also takes away water absorbed from the filtrate.

    Q.23. What are the adaptations of kidneys for the conservation of water?

    Ans. Kidneys are adapted for the conservation of water. For this purpose two types of nephrons are found in kidneys. Such as cortical nephrons which have sorter lop of henle where the reabsorption of water is lower and Juxtamedullary nephrons which have longer loop of henle which extend up to medulla. In these nephrons reabsorption of water is higher. If kidney has larger number of Juxtamendullary nephrons there is greater conservation of water.

    Q.24. How many types of nephrons are there?

    Ans. There are two types of nephrons.

    1. Cortical Nephrons: Which have shorter loop of Henle where the reabsorption of water is lower.

    2. Juxtamedullary Nephrons: Which have longer loop of Henle which extend up to medulla. In these nephrons reabsorption of water is higher.

  10. #10
    Aatif77 is offline Senior Member+
    Last Online
    9th February 2021 @ 03:25 PM
    Join Date
    20 Dec 2014
    Age
    28
    Gender
    Male
    Posts
    80
    Threads
    7
    Credits
    212
    Thanked
    4

    Default

    gud helpful

Similar Threads

  1. Replies: 10
    Last Post: 28th August 2014, 06:57 AM
  2. Biology 'Homeostatis' (Short Questions)Part B
    By Emad Hassan in forum 12th
    Replies: 3
    Last Post: 17th March 2013, 12:03 PM
  3. Replies: 1
    Last Post: 27th September 2012, 01:19 PM
  4. Replies: 7
    Last Post: 5th March 2012, 03:31 PM
  5. Replies: 0
    Last Post: 21st September 2011, 12:51 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •