Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Excretory Products and Their Elimination — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
Removal of harmful metabolic wastes from the body is:
- A.Digestion
- B.Excretion
- C.Respiration
- D.Circulation
2.
The main nitrogenous waste in humans is:
- A.Ammonia
- B.Urea
- C.Uric acid
- D.Glucose
3.
Urea is made in the:
- A.Kidney
- B.Liver
- C.Lung
- D.Skin
4.
Tubes that carry urine from the kidneys to the bladder are the:
- A.Ureters
- B.Urethra
- C.Arteries
- D.Veins
5.
The functional unit of the kidney is the:
- A.Neuron
- B.Nephron
- C.Alveolus
- D.Villus
6.
The knot of capillaries inside Bowman's capsule is the:
- A.Glomerulus
- B.Alveolus
- C.Villus
- D.Lacteal
7.
Besides the kidneys, which organ removes CO₂ and water vapour?
- A.Lungs
- B.Stomach
- C.Heart
- D.Pancreas
8.
The first step of urine formation is:
- A.Reabsorption
- B.Glomerular filtration
- C.Secretion
- D.Egestion
9.
During reabsorption, the kidney returns to the blood all of the:
- A.Urea
- B.Glucose
- C.Water vapour
- D.Blood cells
10.
About how much urine is formed daily from ~180 L of filtrate?
- A.1.5 litres
- B.50 litres
- C.100 litres
- D.180 litres
11.
Balancing the body's water and salt content is called:
- A.Osmoregulation
- B.Digestion
- C.Photosynthesis
- D.Transpiration
12.
When the body lacks water, ADH causes the kidney to:
- A.Reabsorb more water
- B.Lose more water
- C.Stop filtering
- D.Make more glucose
13.
Hard crystals of salts in the kidney are:
- A.Kidney stones
- B.Clots
- C.Plaques
- D.Cysts only
14.
Artificial cleaning of blood in kidney failure is:
- A.Dialysis
- B.Digestion
- C.Filtration of food
- D.Respiration
15.
The permanent cure for complete kidney failure is a:
- A.Kidney transplant
- B.Blood test
- C.X-ray
- D.Vaccination
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
Blood cells and large proteins are normally absent from the glomerular filtrate because they:
- A.Are too big to pass through the filter
- B.Are destroyed in the kidney
- C.Turn into urea
- D.Are reabsorbed first
17.
Glucose in the urine of a person may indicate diabetes because the filtered glucose:
- A.Exceeds what the tubules can reabsorb
- B.Is made by the kidney
- C.Cannot be filtered
- D.Turns into urea
18.
On a hot day with heavy sweating, the urine produced tends to be:
- A.Small in amount and concentrated
- B.Large in amount and dilute
- C.Unchanged
- D.Full of glucose
19.
Reabsorption is essential because without it the body would:
- A.Lose vital water, glucose and salts in the urine
- B.Make no urea
- C.Stop breathing
- D.Gain weight
20.
In haemodialysis, urea moves from the blood into the dialysing fluid by:
- A.Diffusion across a selectively permeable membrane
- B.Active pumping by the machine
- C.Boiling
- D.Filtration of cells
21.
Drinking plenty of water helps prevent kidney stones because it:
- A.Dilutes the salts so they are less likely to crystallise
- B.Stops filtration
- C.Adds urea
- D.Removes nephrons
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Excretion
- (B) Urea
- (B) Liver
- (A) Ureters
- (B) Nephron
- (A) Glomerulus
- (A) Lungs
- (B) Glomerular filtration
- (B) Glucose
- (A) 1.5 litres
- (A) Osmoregulation
- (A) Reabsorb more water
- (A) Kidney stones
- (A) Dialysis
- (A) Kidney transplant
Section B — Challenge / Olympiad (2 marks each)
- (A) Are too big to pass through the filter
- (A) Exceeds what the tubules can reabsorb
- (A) Small in amount and concentrated
- (A) Lose vital water, glucose and salts in the urine
- (A) Diffusion across a selectively permeable membrane
- (A) Dilutes the salts so they are less likely to crystallise
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