When testing a leaf for starch, why is the leaf placed in hot alcohol?
To extract the chlorophyll
An ant is 6 mm long. A drawing of the ant is 12 mm long. What is the magnification of the drawing?
x2
Which nutrients can provide the body with energy?
protein, carbohydrates and fats
Which element is found in all proteins, but not in carbohydrates or fats?
nitrogen
When animal cells are placed in pure water, they burst. Plant cells do not burst in these conditions. Why don’t the plant cells burst?
The cell wall stops the cell from expanding too much
What is the name of the smaller molecules that join together in long chains to form protein molecules?
amino acids
What is the name of the polysaccharide that is used for the storage of energy in the liver?
glycogen
When leaves photosynthesise, they make carbohydrates. In what form is the carbohydrate transported to other parts of the plant?
sucrose
Which nutrient (other than protein) helps to make haemoglobin, which transports oxygen in the blood?
iron
Which energy transfer takes place in photosynthesis? ____ energy is transferred into ________ energy
light into chemical
Which reagent is used to test for reducing sugars?
Benedict's
Some catalase was added to some hydrogen peroxide. Bubbles of oxygen were given off. After a while, the reaction stopped. Why did the reaction stop?
All the hydrogen peroxide was used up
How does carbon dioxide get into a leaf?
Through the stomata
Some plant cells were placed in a concentrated sugar solution. Their cytoplasm and cell membranes shrank and pulled away from the cell walls. What is the term for this condition?
Plasmolysis
A drawing of an ant is 75 mm long. The magnification of the drawing is × 15. What is the real length of the ant?
5mm
What is a green pigment that absorbs energy from sunlight for photosynthesis?
Chlorophyll
Which structure controls the movement of substances into and out of a cell?
Cell membrane
What is the correct term for the removal from organisms of toxic waste materials of metabolism?
Excretion
In what form is carbohydrate transported in human blood?
glucose
What are the 4 smaller molecules from which a fat molecule is made?
3 fatty acids and 1 glycerol
What is the term for water diffusing down its concentration gradient?
Osmosis
Which substance is found in plant cell walls?
Cellulose
What are the 6 requirements for life?
movement respiration sensitivity growth reproduction excretion nutrition