Passage II
Triticum aestivum wheat plants grown in a particular soil are affected by salt (NaCl) in the soil, overwatering of the soil, or both. A study examined the effects.
The following 5 steps were performed:
1. Forty identical pots were divided equally into 4 groups (Groups 1—4).
2. Five kilograms (kg) of the soil was put into each Group 1 pot and each Group 3 pot. A mixture of 4.98 kg of the soil and 20 g of NaCl was put into each Group 2 pot and each Group 4 pot.
3. Ten wheat seeds were planted in each pot and watered daily until all the seeds sprouted. Then 7 of the 10 seedlings were removed from each pot.
4. Over the next 4 months, all the pots received the same amount of sunlight and the same amounts of nutrients daily. Each Group 1 pot and each Group 2 pot received 500 mL of water daily. Each Group 3 pot and each Group 4 pot received 500 mL of water daily, except for 3 consecutive weeks during the third month. Over that 3-week period, each Group 3 pot and each Group 4 pot was overwatered by keeping the water level 1 cm above the top of the soil.
Table 1 describes the differences among the groups.
5. At 4 months, 2 averages were calculated for the plants in each group of pots: the average plant mass (roots included), in g per plant, and the average grain yield (mass of grain produced), in g of grain per plant.
The average plant mass results are shown in Figure 1. and the average grain yield results are shown in Figure 2.
7. Assume that wheat plants with a greater mass also have a greater height. Based on Figure 1, the average height of the wheat plants in which group of pots was greatest?
Your Answer is
Correct Answer is A
Explanation
According to the premise assumed in the title "the greater the plant mass, the higher the plant height" refer to figure 1, the average plant mass of Group 1 is the largest, so the average height should also be the largest