Which nephridial opening is lined with cilia?
Correct answer A. Nephrostome
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Biology MCQs
Page 20 of Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 20 of 75
Which of these animals excretes nitrogenous waste mainly as uric acid?
Correct answer A. Birds
In which plants do leaves have a thick, waxy, leathery cuticle?
Correct answer A. Xerophytes
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To which thermal group do bats and hummingbirds belong?
Correct answer D. Heterotherms
A 0.4 cm stone is blocking the outlet of the renal pelvis, causing mild to moderate obstruction. Which technique would be chosen to remove it?
Correct answer C. Extracorporeal shock wave lithotripsy
Which vascular channels are associated only with juxtamedullary nephrons?
Correct answer D. Vasa recta
In the urea cycle, how many ammonia molecules combine with one CO2 molecule to make one urea molecule?
Correct answer D. 2
Which of these nitrogenous wastes is the most toxic?
Correct answer B. Ammonia
In osmosis, in which direction do water molecules move across a semipermeable membrane?
Correct answer A. Lower solute concentration to higher solute concentration
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What is the normal body temperature of mammals such as humans?
Correct answer B. 36 – 38°C
Which fish drink large amounts of sea water and produce small amounts of concentrated urine, removing salt while keeping water loss to a minimum?
Correct answer A. Bony fishes
Which statement about homeostasis is incorrect?
Correct answer B. Homeostatic mechanisms keep the internal environment fixed despite wide changes in the external environment
How do plants in cooler regions stop lipids crystallising in their cell membranes?
Correct answer B. Increase in proportion of unsaturated fatty acids
Which mechanism explains why anaemia develops in renal failure?
Correct answer A. Failure of proper RBC synthesis due to lack of chemical stimulation
Which constituent is present in the greatest amount in the filtrate leaving the proximal convoluted tubule?
Correct answer B. Nitrogenous waste
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Which animals have protonephridia?
Correct answer D. Flatworms
In what form do aquatic animals usually excrete nitrogenous waste?
Correct answer B. Ammonia
How can terrestrial animals such as the kangaroo rat survive without drinking water?
Correct answer B. They feed on carbohydrate-rich seeds which provide them with metabolic water
By retaining which substance can marine fishes keep their body fluids hypertonic to the surrounding seawater?
Correct answer A. Trimethylamine oxide
On a hot summer afternoon your body keeps its internal temperature well below that of the surroundings. What is this an example of?
Correct answer B. Negative feedback