Class 11 Biology chapter 15 Excretion and Osmoregulation Solutions

Maharashtra state board Class 11 chapter 15 Excretion and Osmoregulation

Maharashtra state board Biology Textbook Solutions for Class 11 are very important and crusial that helps the students in understanding the hard topics and helps them in the preparation of class 11 board examination as well as verious compititive entrance examinations also. Studying the answers to the questions in the Biology textbook will check your understanding of a particular topic and helps you determine your strengths and weaknesses.

Class 11 Biology textbook Solutions for Class 11, Biology  Chapter 15 Excretion and Osmoregulation  maharashtra state board are provided here with simple step-by-step  detailed explanations. These solutions for Excretion and Osmoregulation  are very popular among Class 11 students for biology chapter 15 Excretion and Osmoregulation  Solutions come handy for quickly completing your homework and preparing for compititive exams like NEET, CET abd verious medical entrance examination also. All questions and answers are taken from the class 11 Biology textbook, Bjology Textbook Solutions of Class  11 Biology Chapter 15 are provided here for you for without any charge its free for you. All Biology textbook Solutions for class 11. Solutions for class 11 Biology subject, These biology textbook solutions are prepared by   experts in the field and are 100% accurate for you.


1. Choose correct option
A. Which one of the following organisms 
would spend maximum energy in 
production of nitrogenous waste?
a. Polar bear
b. Flamingo
c. Frog
d. Shark

B. In human beings, uric acid is formed due to metabolism of __________.
a. amino acids
b. fatty acids
c. creatinine
d. nucleic acids

C. Visceral layer : Podocytes :: PCT : 
_______
 a. Cilliated cells
 b. Squamous cells
 c. Columnar cells
 d. Cells with brush border

D. Deproteinised plasma is found in 
__________.
a. Bowman's capsule
b. Descending limb
c. Glomerular capillaries
d. Ascending limb

E. Specific gravity of urine would _______
if level of ADH increases.
a. remain unaffected
b. increases
c. decreases
d. stabilise

F. What is micturition?
a. Urination
b. Urine formation
c. Uremia
c. Urolithiasis

G. Which one of the following organisms 
excrete waste through nephridia?
a. Cockroach
b. Earthworm
c. Crab
d. Liver Fluke

H. Person suffering from kidney stone is 
advised not to have tomatoes as it has 
_______.
a. seeds
b. lycopene
c. oxalic acid
d. sour taste

I. Tubular secretion does not take place in ________.
a. DCT
b. PCT
d. collecting duct
d. Henle's loop

J. The minor calyx ____________.
 a. collects urine
 b. connects pelvis to ureter
 c. is present in the cortex 
 d. receives column of Bertini

K. Which one of the followings is not a part of human kidney?
 a. Malpighian body 
 b. Malpighian tubule
 c. Glomerulus
 d. Loop of Henle

L. The yellow colour of the urine is due to presence of ___________
a. uric acid
b. cholesterol
c. urochrome
d. urea

M. Hypotonic filtrate is formed in _______
a. PCT
b. DCT
c. LoH
d. CT

N. In reptiles, uric acid is stored in _____
a. cloaca
b. fat bodies
c. liver
d. anus

O. The part of nephron which absorbs 
glucose and amino acid is______
 a. collecting tubule
 b. proximal tubule
 c. Henle's loop
 d. DCT

P. Bowman's capsule is located in kidney 
in the ________
a. cortex
b. medulla
c. pelvis
d. pyramids

Q. The snakes living in desert are 
mainly__________
a. aminotelic
b. ureotelic
c. ammonotelic
d. uricotelic

R. Urea is a product of breakdown of___________
a. fatty acids
b. amino acids
c. glucose
d. fats

S. Volume of the urine is regulated by__________
a. aldosterone
b. ADH
c. both a and b 
d. none


2. Answer the following questions
A. Doctors say Mr. Shaikh is suffering from urolithiasis. How it could be explained in simple words?
Answer :
  1. Mr. shaikh is suffering from urolithiasis which is commonly called as Stones in Kidneys or bladder Or Urethra.
  2. Kidney stones are a typical reason for blood in the pee and agony in the belly, flank, or crotch.
  3. Kidney stones happen in 1 out of 20 individuals sooner or later in their life.
  4. The improvement of the stones is identified with diminished pee volume or expanded discharge of stone-framing segments, for example, calcium, oxalate, urate, cystine, xanthine, and phosphate.


B. Anitaji needs to micturate several 
times and feels very thirsty. This is an 
indication of change in permeability of certain part of nephron. Which is this part?
Answer : It is the ascending limb of loop of Henle. It is present in the kidney and helps in the purification of water. Explanation: The loop of Henle acts as a semipermeable membrane through which the water and the waste are separated.

C. Effective filtration pressure was calculated to be 20 mm Hg; where 
glomerular hydrostatic pressure was 70 mm of Hg. Which other pressure is affecting the filtration process? How much is it?
Answer : BCOP = 30mm Hg and CHP = 20 mm Hg affect the filtration process.

BCOP= Blood colloidal osmotic pressure

CHP= Capsular hydrostatic pressure

Explanation: Effective filteration pressure = GHP - ( BCOP - CHP)
EFP = 70-(30+20)
EFP =20.

D. Name any one guanotelic organism.
Answer : spider, scorpion are the example of guanotelic organisms.

E. Why are kidneys called 'retroperitoneal'?
Answer : The left kidney sits a bit higher in the body because of the size of the liver, which is also on the right side. The kidneys are considered “retroperitoneal” organs, which means they sit behind a lining in the abdominal cavity, unlike all other abdominal organs.

F. State role of liver in urea production.
Answer : Urea is the end product of protein metabolism. Amino acid catabolism results in waste ammonia.  The urea produced by the liver is then released into the bloodstream where it travels to the kidneys and is ultimately excreted in urine which generally accounts for 80 to 90% of the nitrogen containing substances

G. Why do we get bad breath after eating 
garlic or raw onion?
Answer : Sulfur compounds give foods their distinctive flavor. They also release distinctive gasses when cut or mashed, and mingle with gas-emitting bacteria, causing a certain scented breath. Garlic and onion can continue to cause bad breath for hours after eating.


3. Answer the following questions
A. John has two options as treatment for 
his renal problem : Dialysis or kidney 
transplants. Which option should he 
choose? Why?
Answer : He should choose kidney transplant as dialysis could me very dangerous and it's related to renel problem.

B. Amphibian tadpole can afford to be ammonotelic. Justify.
Answer : Amphibians can survive both in land and water and the adult amphibian, which is mostly terrestrial, secretes urea as a waste product and is ureotelic. The tadpoles of the amphibians are mostly aquatic, hence, the nitrogenous waste contains soluble ammonia and they are referred to as ammonotelic.

C. Birds are uricotelic in nature. Give reason.
Answer : Birds are called uricotelic as they excrete nitrogenous waste materials by turning it into uric acid. Thus they are called as uricotelic animals. Explanation: Birds and reptiles are capable of turning the nitrogenous waste products into uric acid as nitrogen is produced by breaking down of protein rich food.


4. Write the explanation in your word
A. Nitya has been admitted to hospital after heavy blood loss. Till proper treatment could be given; how did Nitya's body must have tackled the situation?
Answer :
  1. In case of heavy blood loss till proper treatment could be given in nitya's body manages in the following ways:
  2. At the point when the circulatory strain or blood pressure drops, the body attempts to repay by vasoconstricting and expanding the pulse. 
  3. These are ways the body attempts to make the pulse higher. 
  4. In the event that the blood loss proceeds, the pulse will become lower, which implies the body's normal reaction to repay is fizzling.