Kerala SCERT Class 9 Biology Excretion to Maintain Homeostasis Question Answer
Kerala SCERT Class 9 Biology Chapter 5 Excretion to Maintain Homeostasis Question Answer Solution Here. Kerala Board Class 9 Students can find Here 5th Chapter Excretion to Maintain Homeostasis Notes provide by our Teacher. Important Question Answer from Chapter 5 Excretion to Maintain Homeostasis.
- Board- Kerala Board.
- Class – 9.
- Subject – Biology Part 2
- Chapter – 5
- Chapter Name – Excretion to Maintain Homeostasis.
- Topic – Question Answer Solution.
More Question & Answers
1) What are the main excretory products in the human body?
Nitrogenous compounds formed by the metabolism of amino acids and nucleic acids, carbon dioxide and water which are the by-products of respiration etc., are the main excretory products in human beings.
2) What is the main objective of sweating?
The main objective of sweating is regulation of body temperature.
3) Which are waste products which are expelled from the body?
Urea, salt and water are expelled from the body mainly through urine.
4) Which are the major excretory organs in human beings?
Kidneys are the major excretory organs in human beings.
5) What is the shape and location of the kidney?
Human beings have a pair of kidneys. They are bean-shaped and are located in the abdominal cavity on either side of the vertebral column.
The left kidney is located slightly higher. Each kidney is covered by a strong but soft membrane.
6) It is said that a kidney comprising about 12 lakh ultrafilters justify the following statement.
Each kidney comprises about 12 lakh ultrafilters. These are called nephrons. Nephrons are the basic structural and functional units of kidneys
Cortex: – The light-coloured outer part of the kidney. Ultrafilters of the nephrons are found here.
Medulla: – The dark coloured inner part of the kidney. Long tubules of nephrons are found.
Pelvis: – Region where urine from the filters flows into.
7) What are characteristics that help in ultrafiltration?
When blood flows through the glomerulus, ultrafiltration takes place through its small pores. This process is supported by the high pressure developed in the glomerulus, due to the difference in the diameters of afferent vessel and efferent vessel. The glomerular filtrate formed as a result of this is collected in the capsular space.
8) What is the process and components of reabsorption and secretion?
When glomerular filtrate flows through renal tubules to the collecting duct, essential components are reabsorbed to the peritubular capillaries.
The excess components that are retained in blood even after ultrafiltration are secreted to renal tubules from the capillaries.
Glucose, amino acid (complete absorption), Na+, K+, Ca2+, water (partial absorption), H +, K+, Urea are the components reabsorbed.
Assertion and reasoning
Assertion: nephritis is a disease with turbid and dark coloured urine
Reasoning: inflammation of kidney as of infection or intoxication
1.) both assertion and reasons are wrong
2.) both assertion and reasons are correct
3.) assertion is wrong but reason is correct
4.) assertion is correct but reason is wrong
Answer 2
Case base question
Plants also have methods to excrete waste materials, but they do not have seperate excretory systems as in animals. The rate of life activities are less in plants when compared to animals.
1.) What are the ways plants have excretion in plants?
2) What hydathodes are, explain its function?
3.) What are the components expelled out from stomata?
1.) Stomata or Lenticel, Hydathodes, heartwood, Abscission of leaves
2.) small pores present at the tip of leaves called hydathodes. It helps in eliminating excess water.
3.) Stomata function in expelling carbon dioxide, water, and oxygen
Class 9th students were first introduced to the biology lab on science day where different organisms were preserved in the bottles with formalin in it. for each organism different parts were explained and their function. students were asked to make a report and add the excretory systems of different organisms and their product. jaya and radhika had some doubt try to solve it
1.) Do organisms have any different organs than the kidney?
2) What are different products released by organisms?
3.) the permanent slide of amoeba was placed under the microscope in the lab to explain the excretion in it?
1.) Some organisms have different organs for excretion like malphighian tubules in insects, nephridia in earthworm, and also vacuoles in amoeba.
2.) amoeba, fish, and earthworms excrete the product ammonia. insects, reptiles and birds release uric acid, frogs release urea and are excreted as urine.
3.) In amoeba, No specific excretory organ. Ammonia, excess water that reach the cell etc. are expelled through contractile vacuoles.
More Notes by Expert Teacher:
1) The food that we take is absorbed by the kidney and the waste is produced. What are the main excretory products in the human body?
The metabolism of amino acids and nucleic acids forms compounds like nitrogenous waste. Even carbon dioxide and water are the by-products of respiration which are the main excretory products in human beings.
2) What is the main objective of sweating?
Regulation of body temperature is the main objective of sweating.
3) Name the waste products expelled from the body?
Urea, salt and water are expelled through urine.
4) Name the major excretory organs in human beings?
The major excretory organ in human beings is the kidney.
5) Write about the shape and location of the kidney?
Human beings have a pair of kidneys. They are bean shaped and are present in the abdominal cavity on either side of the vertebral column. The left kidney is located slightly higher. kidney is covered by a soft membrane.
6) Assertion and reasoning
Assertion: nephritis is a disease with turbid and dark colored urine reasoning: inflammation of kidney as of infection or intoxication
1.) both assertion and reasons are wrong
2.) both assertion and reasons are correct
3.) assertion is wrong but reason is correct
4.) assertion is correct but reason is wrong
answer 2
7) Case base question
Plants also have methods to excrete waste materials, but they do not have separate excretory systems as in animals. The rate of life activities is less in plants when compared to animals.
1.) What are the different ways plants excrete?
2.) What hydathodes are, explain its function?
3.) What are the different components expelled out from the stomata?
1.) Abscission of leaves, Stomata, Lenticel, heartwood, Hydathodes.
2.) At the tip of the leaves small pores are present called hydathodes. It helps in eliminating excess water.
3.) stomata function is mainly in expelling carbon dioxide, water, and oxygen.
9th class students were first taken to the biology lab on science day exhibition where organisms are preserved in bottles having formalin. Parts of excretion and organisms were explained for each organism. Students were asked to write a report. gayatri and Vaibhav had some doubt try to solve it
1.) various organisms have different organs than the kidney explains?
2.) What are different products released by organisms?
3.) by observing the permanent slide of amoeba that was shown in biology lab, placed under the microscope in the lab try to explain the excretion of it?
1.) Some organisms have different organs for excretion like Malpighian tubules in insects, nephridia in earthworm and vacuoles in amoeba.
2.) amoeba, fish and earthworms excrete ammonia as waste product. Uric acid is released by insects, reptiles and birds, frogs release urea which are excreted as urine.
3.) In amoeba, No specific excretory organ. Ammonia and excess water are expelled through contractile vacuoles.
8) What are the processes and which components are reabsorbed and secreted?
To the collecting duct the glomerular filtrate flows by renal tubule,
In the peritubular capillaries the essential components are reabsorbed. Even after ultrafiltration the excess components retained in blood are secreted to renal tubules from the capillaries. Glucose and amino acid are completely absorbed, Na+, Ca2+, K+ and water are partial absorbed, K+, H +, Urea are the components reabsorbed.
9) It is said that a kidney comprising about 12 lakh ultrafilters justifies the following statement.
Each kidney comprises about 12 lakh ultrafilters. These are called nephrons. they are the basic structural and functional units of kidneys
Cortex: – This is the light-colored outer part of the kidney. Ultrafilters of the nephrons are found here.
Medulla: – this is the dark colored inner part of the kidney. Long tubules of nephrons are found.
Pelvis: – the filtered urine flows.
10) What are characteristics that help in ultrafiltration?
Ultrafiltration takes place, when blood flows through the glomerulus through its small pores. This process is more enhanced by high pressure that is developed in the glomerulus, because of difference in the diameters of afferent and efferent vessel. The glomerular filtrate formed is collected in the capsular space.
Also See: This Chapter MCQ Question and Answer