DISAMATA seperates front teeth from side teeth, molars in WM arrangement for grinding cellulose, incosors on lower jaw only, cuts against horny pad of the upper jaw, molars have lard cusps gor griding
3 of 33
Why is the casum in rabbits full of bacteria
mammales unable to digest cellulose, bacteria break down cellulose cel wals
4 of 33
3 ways which CO2 is transported in the human blood stream
85% in blood stream as bicorbonate ions,15% dissolved in plasma or in combination with heamoglobin
5 of 33
name the enzyme that converts CO2 into carbonic acid
carbonic anhydrase
6 of 33
What happens to bicarbonate ions in rbc
The pass into plasma
7 of 33
Describe the function of hydrogen ions prodced in the RBC
Dissacociate oxyhaemoglobin to release O2, to be used in respiration by muscle
8 of 33
Why is inc. in atmpspheric co2 a concern
ince acidity in water, death of fish, destrucion of reefs
9 of 33
Explain what is ment by the term cohesion
Strong attraction that h20 molocues exert on each other
10 of 33
In the cohesion tension theory how is tension generated
Watewr molocules evaportaing through th estmata at top of column replace dfrom below, because of cohesion this creates an upward force throughout th ewhole column
11 of 33
What additional force hwlps to support the water molocules in the xlem against th force of gravity
adhesion between water mlocules and hydropilic xylem wall
12 of 33
What addisiotnal small force influences the upward movement of water
Root pressure
13 of 33
explain how root pressure is generated
Active transport of ions into root xylem creates an osmotic gradient
14 of 33
A plant in which atmospheric nirtogen is converted to nitrates
Legume
15 of 33
Explain why small unicellular organiasm do not require a speciaised gas exchage and transport system
Enough o2 obtained by simple diffusion to satify respiritry requirtemtns, short diffusion pathway, low metablic rate, large sa:vol, fast enough
16 of 33
State the main ehypothesis used to explain the transport of organic solutes in plants
Mass flow hypothesis
17 of 33
Name the compound required by plants to synthesis amino acids
Nitrates
18 of 33
What exactly does a potometer measure
Water uptake by shoot
19 of 33
What stewps would you take to assemble a potometer correctly
Cut shoots underwater, ensure joints are airtight, Keep leaves dry, set up apparatus underwater
20 of 33
Give 2 reasons for loss of biomass between trophic levels of the food chain
Resperation, loss thorugh heat, not all of organism eaten
21 of 33
2 sources of error in collecting data for pyramids of biomass
Dead organisms not collected, not all of plants collected, e.g roots
22 of 33
2 sources of error in collecting data for pyramids of biomass
Dead organisms not collected, not all of plants collected, e.g roots
23 of 33
The maine region of the gut where digestion takes place
mouth, stomach, small intestine
24 of 33
The main region of the gut where absorption takes place
large intestine, small intestine
25 of 33
Why does the tapeworm live in the intestine
Absorbes nutrienst from digested food
26 of 33
How is the tapeworm adapted to overcome peristalsis
hooks and suckers
27 of 33
HOw is it adapted to overcome digestive enzymes
Thick cuticle
28 of 33
WHat do lymph vessels do
draisn tissue fluid
29 of 33
Definition of autotroph
uses inorganic molocules to synthesis organic compounds
30 of 33
Definitoin of a saprophyte
secretes enzymes onto food, absorbs products
31 of 33
What blood vessles are found on the surface of the heart
Comments
No comments have yet been made