Photosynthesis reaction and uses of glucose from photosynthesis

What type of chemical reaction is photosynthesis?

An endothermic reaction

What is an endothermic reaction?

A chemical reaction that requires energy for it to take place; in the case of photosynthesis, light energy

What is the word equation for photosynthesis?

Carbon dioxide + water -> glucose + oxygen, with light energy (and chlorophyll) above (and below) the arrow

What is the balanced symbol equation for photosynthesis?

6CO2 + 6H2O -> C6H12O6 + 6O2 (all numbers following an element are subscript)

What is chlorophyll, where is it found and what is its function?

A green pigment found in chloroplasts that absorbs light energy for photosynthesis

From where does a plant obtain carbon dioxide, and where and how does it enter the plant?

From the atmosphere/air; it diffuses through the stomata (holes) into the leaves

From where does a plant obtain water, and where and how does it enter the plant?

From the soil; it diffuses by osmosis into the root hair cells

How are photosynthesis and respiration related?

Photosynthesis makes glucose, which is then used in respiration

Why do plants need to carry out respiration?

To release energy to carry out chemical reactions (e.g. protein synthesis)

What can the glucose produced in photosynthesis be converted into in order to store energy?

Starch or lipids (fats or oils)

Which solution tests for the presence of starch, and what is a positive result in this test?

Iodine solution; turns from yellow/orange-brown to blue-black

What can the glucose produced in photosynthesis be converted into in order to strengthen cell walls?

Cellulose

Glucose can also be combined with nitrate ions to produce amino acids. What are amino acids needed for?

Protein synthesis (which takes place at the ribosomes)

Recap from year 9: which solution tests for the presence of protein, and what is a positive result in this test?

Biuret solution; turns from blue to purple