EVERYDAY SCIENCE - PLANT SYSTEMS

Question 1

The graph shows how the rate of photosynthesis changes with the wavelength of light absorbed. The unit for wavelength of light is nanometers (nm).

plant oeq1.jpg
Answer 1

Fill in the blanks with the keywords provided below.
[light] • [decreases] • [minimum] • [increases] • [reflected] • [absorb] • [food] • [survive]

a) Describe how the photosynthetic rate changes with the wavelength of light from 450 nm to 680 nm.

Answer:

As wavelength of increases from 450 nm to 560 nm, photosynthetic rate . Photosynthetic rate is at a at 560 nm. As the wavelength of light increases from 560 nm to 680 nm, photosynthetic rate .


b) Ace is growing some plants in an indoor garden, which is lined with light bulbs. He wants to use bulbs that give out green light to improve the growth rate of her plants. After a few days, he found that her plants died.
Explain why the plants died with references to how the plant will interact with green light.

Answer:

Most of the green light will be by the plant. The plant cannot green light well to photosynthesise. Without , the plant is unable to .




DO YOU KNOW plain.png

“Chlorophyll is not the only substance in chloroplasts that absorb light. Other pigments such as carotenoids and anthocyanins are also present to absorb light at different wavelengths. Carotenoids are responsible for the yellow and orange colours, and anthocyanins provide red and purple colours. However, compared to chlorophyll, they contribute very little to photosynthesis.

Read more about carotenoids and the functions they have in the leaf.”