mock practice questions review Flashcards
name adaptations of a herbivores dentition
premolars and molars with cusps for breakdown of nutrients.
-large incisors.
reason for refection in rabbits
more time to absorb nutrients
Cows feed in a similar way to rabbits but do not show refection.
Explain this difference.
Cows have (four) more than one stomach(s). [1]
Food is regurgitated for further grinding/chew the cud. [1]
Additional stomachs for bacterial fermentation.
Most of the carbon dioxide (85%) transported in the human blood stream is carried as
bicarbonate ions.
(a) Describe the two other ways in which the remaining 15% is carried.
carbamino haemoglobin
dissolved in plasma.
The carbonic acid in the red blood cell is ionised into hydrogen ions and bicarbonate
ions.
(i) Describe what then happens to the bicarbonate ions
diffuses out of RBC into plasma.
what is the function of the hydrogen ions
dissociate oxyhaemoglobin to release oxygen needed for respiration
how does a tapeworm survive without a digestive system
absorbs nutrients directly over the parasites body surface.
what is the name for a parasite containing both male and female reproductive organs
hermaphrodite
Name the tissue and the type of cell where you would expect the greatest amount of
radioactivity to be detected when investigating translocation
phloem and sieve tubes
Explain how the steepness of the
curve in region X helps the tissues in a mammal function more efficiently.
small drop of partial pressure/concentration of oxygen (not: low pp);
large amount of oxygen supplied/dissociates more easily;
tissues can respire aerobically;
aerobic respiration far more efficient
than anaerobic / prevents lactic acid production
what is the role of smooth muscle in wall of small inestine
circular muscle contracts longitudinal relaxes for peristalsis causing a wave of muscle contraction propelling food along.
what is the fate of amino acids
amino groups excreted in urea and remainder to glycogen
name 2 adaptations of the sieve tube elements
plasmodesmata in cell wall to allow exchange of materials .
-no organelles to obstruct movement.
what is the mass flow theory suggest
passive flow of sugars for high to low conc from source to sink. mitochondria suggests energy is required.
what is the functions of hydrogen carbonate ions in the digestive system
acts as a buffer to inrease PH from stomach
