To help students retrieve the right solutions for all the questions given in CBSE Class 11 Biology NCERT book we have collated detailed and accurate answers here at jagranjosh.com. Explained by subject matter experts, all these solutions will help students learn the right technique to write perfect answers in the annual exams and earn high scores.
In this article we are providing the NCERT solutions for Class 11 Biology chapter 19, Excretory Products and their Elimination. Our subject experts have reviewed these NCERT solutions to provide you the error free content. Students will find it very easy to understand the technique employed in each solution.
Some of the questions and their solutions from NCERT Solutions for Class 11: Excretory Products and their Elimination, are as follows:
Q. Define Glomerular Filtration Rate (GFR)
Ans. During the formation of urine, the amount of the filtrate that formed by the kidneys per minute is called glomerular filtration rate (GFR). GFR in a healthy individual is approximately 125 ml/ minute.
Q. Explain the autoregulatory mechanism of GFR.
Ans. Regulation of GFR: The kidneys have an auto regulatory mechanism for the regulation of glomerular filtration rate. It is carried out by the juxta glomerular apparatus (JGA). Juxtaglomerular apparatus is a special sensitive region formed by cellular modifications in the distal convoluted tubule and the afferent arteriole at the location of their contact. Whenever the glomerular filtration rate decreases, it activates the juxtaglomerular cells to release renin which can stimulate the glomerular blood flow and thereby brings the GFR back to normal.
Q. Describe the role of liver, lungs and skin in excretion.
Ans. Liver: It is the largest gland in our body which helps in the excretion of cholesterol, vitamins, drugs, and other waste materials through bile. It helps in the removal of toxic ammonia by converting it into urea in the liver.
Lungs: They help in the excretion of waste gas carbon dioxide (CO2) from the body along with small quantities of water everyday.
Skin: It is the largest organ covering the entire body that has many glands for the excretion of waste products through pores. Sweat and sebaceous glands are the two important glands in the skin. Sweat produced by the sweat glands helps in the secretion of excess salt and water from the body. Sebaceous glands secrete an oily secretion called sebum that provides a protective oily covering for the skin.
Q. Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why?
Ans. Terrestrial animals are either ureotelic or uricotelic, and not ammonotelic because the terrestrial adaptation requires the production of lesser toxic nitrogenous wastes like urea and uric acid for conservation of water. Ammonia is soluble in water, it cannot be eliminated continuously. Hence, liver convertes ammonia into urea or uric acid which are the less toxic and water insoluble forms. This form of nitrogenous wastes is then released into the blood from where it is filtered and excieted out by the kidneys.
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Class 11 Biology NCERT Chapter: Excretory Products and their Elimination
NCERT books are considered as the best source to gain a thorough understanding of the concepts explained in a subject. Before solving the questions given in a chapter of NCERT book, students should familiarize with the various topics and concepts explained in that chapter. Here, we are providing the CBSE Class 11 Biology NCERT chapter- Excretory Products and their Elimination. Students are advised to thoroughly read this chapter to grasp all the concepts as this will help you understand the problem discussed in a question and then come with an appropriate answer.
Main topics discussed in Class 11 Biology chapter: Excretory Products and their Elimination are:
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