Corrections Flashcards
What is the effect of distance from the light in the elodea practical
As the light is moved closer the light intensity increases so rate of photosynthesis increases so more bubbles are produced
Why is a beaker of water placed in front of the elodea in the practical
To absorb heat so the temperature of the elodea remains constant
In the elodea practical how could the experiment be made more accurate
Collect gas instead of counting bubbles
What is a double circulatory system
When blood passes through two systems; the systemic system and the pulmonary system.
What is the valve in the left atrium to ventricle
bicuspid
What is the valve in the right atrium to ventricle
tricuspid
What do the semi lunar valves do
- open when the heart contracts
- close when the heart relaxes
- prevent back flow of blood
Effects of exercise on the heart
The heart is a muscle. Exercise makes the heart more muscular.
Why do sports scientists measure oxygen and carbon dioxide levels
To more accurately measure aerobic respiration
Effects of reduced oxygen levels on plants (4)
- less aerobic respiration
- less ATP (energy)
- less active transport (mineral uptake)
- nutrient deficiencies
Effects of phosphorus deficiency
Poor root growth
Effects of potassium deficiency
Yellowing of the leaves
Effects of nitrate deficiency
Poor plant growth and repair
Why do roots increase the rate of transpiration
larger surface area for water absorption
2 functions of the small intestine
- absorb nutrients
- digestion of food molecules
2 ways the small intestine is adapted to its functions
- produces enzymes for digestion
- has a large surface area (villi) for absorption of nutrients
are digested food molecules insoluble or soluble
soluble
is protein soluble
no
are amino acids soluble
yes
How can an unbalanced diet and lack of exercise lead to atheroma (2)
- too much fat in diet
- lack of exercise means excess fat is not used as energy
How can atheroma lead to heart attack
- atheroma blocks the coronary arteries
- this prevents oxygen from reaching the heart muscle