<Clip 1.3 part 1> 0:45:34:10 – 0:47:11:10
T recaps on what they've seen and differences between plant and animal cells – cell wall, chloroplasts and sap vacuole – how it is wrapped up in photosynthesis.

Slide 4: Changes IWB picture to equation of photosynthesis with illustrations. T explains the equation: what plant needs (a+b), what factors (c+d) need to be present to enable photosynthesis, and what is made (e+f). Asks Ps to cut up the pictures (from sheets previously handed out) and place them in the correct order on the table; T repeats task – what 2 things are needed, what 2 factors needed to make sugar, what are 2 products made.

<Clip 1.3 part 2> 0:49:15:20 – 0:53:10:20
T circulates, talks to Ps asking what they think a and b are - sunlight and water? P thinks sunlight and oxygen need to be present for photosynthesis. T asks what needs to be there, and what does it actually use. If in use must be a or b, if it just needs to be around, c or d. P is unsure. T continues probing & asks what plant makes. Glucose. Yes. Chlorophyll? No, so it's a factor. Do plants need oxygen for photosynthesis? No, so replace.

We now have water is needed, in the presence of sunlight and chlorophyll, makes sugar. Two gasses are left.

T moves on. Ps discuss. P says it makes glucose and carbon dioxide, and T asks what it needs to make them. P: Sunlight. Some Ps show mild confusion. T: Interesting.

T moves back to work of first pair: You’re saying plant uses water and oxygen, combines them when it has sunlight and chlorophyll to make glucose and carbon dioxide. P: No. T says nearly right, but one important bit needs to be swapped around. <end of second part of clip>

48.35 – 48.53
Ps continue to discuss, one suggests removing water but T probes her to say plant would die. T is encouraging when Ps make a swap: ‘getting closer’.

48.54 – 49.01
T continues circulating, pointing out which bits are right. He moves to another group who have succeeded. T announces one group have completed the equation perfectly .

49.01 – 50.14
T crosses to other side of room, where it's nearly right. He then checks along back row and most people have got it partly right and some completely (T point out correct elements & occasionally suggest swaps).

(50.15 – 51.36)
T calls on Jerry to go to the board and move things into place. Emma can help. Jerry moves the elements: carbon dioxide and water needed; use chlorophyll and sunlight; make glucose and oxygen. Jerry returns to her seat.

T summarises equation of photosynthesis. ‘At least that’s what scientists would have you believe’. T explains that in the next three lessons they'll test this out and see if it's really true, and build on this equation.