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- Which color(s) of light does chlorophyll a reflect? a. red and blue b. green c. red d. blueFor each pigment below tell me which colors and ranges of wavelengths it absorbs the most and which areas of the visible spectrum it absorbs the least. Some might have 2 peaks of high absorption. Chlorophyll a: Chlorophyll b: B-Carotene (carotenoids):An experiment was conducted to demonstrate that chlorophyll is essential for photosynthesis. The procedure followed is given below: • A potted variegated plant was destarched. • Variegated leaves have green parts (where the cells contain chlorophyll) and white parts (where there is no chlorophyll). • A starch test was done on a leaf. • The potted plant was exposed to bright sunlight for 4–5 hours. • After 5 hours, a leaf was removed and tested for starch. How was the potted plant destarched? Explain why all the starch has disappeared during the process Mentioned in QUESTION 1. Describe the steps in the correct sequence that were followed during the starch test. Explain ONE safety precaution that should be taken when testing for starch. Draw a labelled leaf and indicate the colour change in the green and white parts of the leaf, after the second starch test.
- An experiment was conducted to demonstrate that chlorophyll is essential for photosynthesis. The procedure followed is given below: • A potted variegated plant was destarched. • Variegated leaves have green parts (where the cells contain chlorophyll) and white parts (where there is no chlorophyll). • A starch test was done on a leaf. • The potted plant was exposed to bright sunlight for 4–5 hours. • After 5 hours, a leaf was removed and tested for starch. ---------- 1. Draw a labelled leaf and indicate the colour change in the green and white parts of the leaf, after the second starch test.Two fields contain a variety of plants (some C3, some C4 and some CAM). Field A is sprayed with an herbicide that inhibits PEP Carboxylase. Field B is sprayed with an herbicide the inhibits Rubisco. When you return to examine the fields after one week, what do you expect to find, and why?What are terpenes and terpenoids? Briefly discuss their main functions and importance in plants. Discuss the significance of the following tests and what constituent is being detected: Keller-Kiliani test Froth test Liebermann-Burchard test Capillary Tubes test Kedde test
- Observation: I want to know what effect salt has on the growth of grass. So I measure out 3 equal-sized squares of grass out the back of the Green Building. The first square of lawn I water with 5 liters of pure water from a watering can every day. The second square of lawn I water with 5 liters of pure water with 2 grams of salt mixed in, every day. The third square of lawn I water with 5 liters of pure water with 4 grams of salt mixed in, every day. I measure the height of the grass after 14 days and note the following observations. The first square is green and 15 cm high. The second square is greeny-yellow and 6 cm high. The third square is yellowy-brown and looks dead and is only 2cm high. What could we infer about the effect salt has on the growth of grass?What properties of a medicinal plant is affected when the time of harvest changes or is variable?Modified TRUE or FALSE. Write the word TRUE if the statement is correct. If the statement is false, write the incorrect underlined word/s and indicate the correct word/s to make the statement true. Plants use light energy mostly in the invisible light range for photosynthesis.
- There are plant pigments on the column and use a 10:1 dilution of hexanes to acetone as your mobile phase. Only one pigment shows on the column, which pigment is it? chlorophyll B lutein beta-carotene chlorophyll AThe green color of plants is explained by the wavelengths of light that are reflected, transmitted, and absorbed by the chlorophylls in the thylakoids. Which of the following statements is true? Plants appear green because chlorophylls reflect and transmit yellow and green wavelengths of light, and absorb red and violet-blue wavelengths of light. Plants appear green because chlorophylls reflect and transmit red and blue wavelengths of light, and absorb yellow and green wavelengths of light. Plants appear green because chlorophylls reflect and transmit red and blue wavelengths of light, and absorb white wavelength of light. Plants appear green because chlorophylls reflect and transmit white wavelength of light, and absorb red and violet-blue wavelengths of light.The following essential oils are not phototoxic: Choose one answer. a. fig leaf absolute b. steam distilled citrus c. cold pressed citrus d. angelica root
