10 pointsA seventh-grade student has designed an experiment to study
phototropism in radish seedlings. Six radish seedlings will be planted
in Individual foam cups filled with soll. Three cups will be covered with
Box A and three cups will be covered with Box B as shown in the
diagram.
The only light source for each set of seedlings will be an overhead
fluorescent light that enters through the openings cut into the sides of
each box. The plants will receive 8 hours of light per day and will
remain inside the boxes for four days. At the end of the testing period,
the boxes will be removed and the direction of seedling growth will be
compared
opening
in box
opening
in bok
Box A
Box B
Which of the following modifications of the experimental design would
significantly increase the validity of the results? (7.13A/7.2A)
A.
using light bulbs designed for growing indoor plants
B.
doubling the number of seedlings grown in the experiment
C. including a set of three plants grown without a box
D.
planting all the seedlings for each box in one large container
Answers: 1
Chemistry, 22.06.2019 05:00
You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?
Answers: 2
Chemistry, 22.06.2019 10:10
How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?
Answers: 1
Chemistry, 22.06.2019 12:00
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?
Answers: 2
Chemistry, 22.06.2019 17:40
How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?
Answers: 3
10 pointsA seventh-grade student has designed an experiment to study
phototropism in radish seedli...
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