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2024 WAEC Biology Theory (a)State one function each of the following parts of the nephron: (i) glomerulus (ii)Bowman's capsule...

Biology
WAEC 2024

(a)State one function each of the following parts of the nephron:

(i) glomerulus (ii)Bowman's capsule (iii)proximal convoluted tubule (iv) distal convoluted tubule

(b) Complete the table below.

Organism Structure for excretion Form in which waste is excreted by organism
  contractile vacuole  
Flatworm    
Earthworm    
Cockroach    
Human   Liquid
  Stomata pore  

(c) List five excretory products of plants.

 

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Explanation

Functions of the parts of the nephron

(a)(i)Glomerulus carries out ultrafiltration or it filters the blood passing through it.

   (ii)Bowman's capsule receives blood plasma from the glomerulus and filters it to initiate urine formation.

  (iii)Proximal convoluted tubule is responsible for reabsorbing most of the glucose, amino acids, and small peptides that enter the ultrafiltrate back into the bloodstream. 

  (iv)Distal convoluted tubule regulates electrolytes and water balance, and helps maintain pH.

  (b) 

Organism Structure for excretion Form in which waste is excreted by organism
Amoeba/Paramecium contractile vacuole Gaseous/Liquid
Flatworm Flame cell Liquid
Earthworm Nephridium Liquid
Cockroach Malpighian tubule Solid
Human Skin/kidney/lung Liquid
Plants(Green) Stomata pore Gaseous

(c) Excretory products of plants include the following:

   Carbon dioxide, water vapor, oxygen, resins, gum, tannins, alkaloids, oils, and nitrogenous compounds. 


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