Excretory System Important Questions And Answers For Competitive Exams

Excretory System Important Questions And Answers:-

• Primary Excretory organ – Kidney
• Secondary Excretory Organ – Lungs, Skin Liver

Pee is your body's liquid waste. It's mainly made of water, salt, electrolytes such as potassium and phosphorus, and chemicals called urea and uric acid. Your kidneys make it when they filter toxins and other bad stuff from your blood.

Excretory systems regulate the chemical composition of body fluids by removing metabolic wastes and retaining the proper amounts of water, salts, and nutrients. Components of this system in vertebrates include the kidneys, liver, lungs, and skin.

Excretory System MCQ:-

 1. Kidney crystals are solid clusters of ?

(A) Calcium nitrate and uric acid

(B) Phosphate and uric acid

(C) Calcium carbonate and uric acid

(D) Calcium metabisulphite and uric acid

... Answer is (B)

 2. In man, the urea is mainly produced in ?

(A) Liver

(B) Kidneys

(C) Gall bladder

(D) Spleen

... Answer is (A)

 3. A man takes large amount of protein. He is likely to excrete more amount of ?

(A) Water

(B) Glucose

(C) Urea and uric acid

(D) Salts

... Answer is (C)

 4. Which one of the following blood vessels in mammals would normally carry the largest amount of urea ?

(A) Hepatic portal vein

(B) Hepatic vein

(C) Renal artery

(D) Hepatic artery

... Answer is (B)

 5. Which one of the following is likely to accumulate in a diangerous proportion in the blood of a person whose kidney is not working properly ?

(A) Lysine

(B) Ammonia

(C) Sodium chloride

(D) Urea

... Answer is (D)

 6. Uric acid is the chief nitrogenous component of the excretory products of ?

(A) Man

(B) Earthworm

(C) Cockroach

(D) Frog

... Answer is (C)

 7. Which of the following nitrogenous substance is highly toxic ?

(A) Urea

(B) Uric acid

(C) Amino acid

(D) Ammonia

... Answer is (D)

 8. Aquatic reptiles are ?

(A) Ammonotelic

(B) Ureotelic over land

(C) Ureotelic

(D) Ureotelic in water

... Answer is (C)

 9. Man is ?

(A) Ureotelic

(B) Uricotelic

(C) Ammonotelic

(D) Both (B) and (C)

... Answer is (A)

 10. A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of ?

(A) Fats

(B) Aminoacids

(C) Glucose

(D) Ketones

... Answer is (D)

 11. A doctor advised a person to take an injection of insulin because ?

(A) his blood pressure was low

(B) his heart was beating slowly

(C) he was suffering from goitre

(D) his sugar level in blood was high

... Answer is (D)

 12. Which of the following is not an excretory organ of vertebrates ?

(A) Lungs

(B) Skin

(C) Liver

(D) Hepatopancreas

... Answer is (D)

 13. Urinary bladder is absent in ?

(A) Lizards

(B) Snakes

(C) Crocodiles

(D) All the above

... Answer is (B)

 14. Which pollutant accumulates in liver and kidney ?

(A) Copper

(B) Mercury

(C) Lead

(D) Cadmium

... Answer is (B)

 15. All bowman's capsules of the kidney are found in ?

(A) Cortex

(B) Medula

(C) Pelvis

(D) None

... Answer is (A)

 16. Loop of Henle is concerned with ?

(A) Excretory system

(B) Reproductive system

(C) Nervous system

(D) Muscular system

... Answer is (A)

 17. Loop of Henle is meant for absorption of ?

(A) Potassium

(B) Glucose

(C) Water

(D) CO2

... Answer is (C)

 18. Renin is secreted by ?

(A) Cortex

(B) Medulla

(C) Juxta glomerular cells

(D) Prodcytes

... Answer is (C)

 19. The basic functional and structural unit of human kidneys is ?

(A) Nephron

(B) Pyramid

(C) Nephridia

(D) Henle's loop

... Answer is (A)

 20. Mechanism of uric acid excretion in a nephrone is ?

(A) Osmosis

(B) Diffusion

(C) Secretion

(D) Ultrafiltration

... Answer is (D)