Biology Past Questions and Answers

Mass of a crucible = 10g,<br/>Mass of a crucible and soil before heating =29g<br/>Mass of a crucible and soil after heating = 18g<br/>From the information above, determine the percentage of water in the given soil sample?

I. Stomata --> Spirogyra<br/>II. Alveoli --> Earthworm<br/>III. Malpighian tubule -> Mammal<br/>IV. Contractile vacuole -> Protozoa<br/><br/>Which of the above structures is correctly matched with the organisms in which it is found?

The sequence of the one-way gaseous exchange mechanism in a fish is?

The plants that grow in deserts or very dry areas are referred to as?

The two key cations involved in the action potential of nervous transmissions are?