Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
What criteria do we use to decide whether something is alive?
What are outside raw materials used by an organism?
What processes would you consider essential for maintaining life?
What are the differences between autotrophic nutrition and heterotrophic nutrition?
Where do plants get each of the raw materials required for photosynthesis?
What is the role of the acid in our stomach?
What is the function of digestive enzymes?
How is the small intestine designed to absorb digested food?
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
What are the different ways in which glucose is oxidized to provide energy in various organisms?
How is oxygen and carbon dioxide transported in human beings?
How are the lungs designed in human beings to maximize the area for exchange of gases?
What are the components of transport system in human beings? What are the functions of these components?
Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
What are the components of the transport system in highly organized plants?
How are water and minerals transported in plants?
How is food transported in plants?
Describe the structure and functioning of nephrons.
What is the method used by plants to get rid of excretory products?
How is the amount of urine produced regulated?
The kidneys in human beings are a part of the system for:
The xylem in plants is responsible for:
Autotrophic mode of nutrition requires:
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in:
How is fat digested in our bodies? Where does this process take place?
What is the role of saliva in the digestion of food?
What are the conditions necessary for autotrophic nutrition and what are its by-products?
What are the differences between aerobic and anaerobic respiration?
Name some organisms that use the anaerobic mode of respiration.
How are the alveoli designed to maximize the exchange of gases?
What would be the consequences of a deficiency of haemoglobin in our bodies?
Describe double circulation in human beings. Why is it necessary?
What are the differences between the transport of materials in xylem and phloem?
Compare alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.