Discussion
How many number of plants/ha, if a crop is sown at 45 cm×15 cm ?
Answer: A
The crop has 148148 plants per hectare.
Each plant occupies one cell of the spacing grid, 45 cm by 15 cm, and one hectare is \(10{,}000\ \text{m}^{2}\).
\[ \begin{aligned} \text{area per plant} &= 0.45 \times 0.15 = 0.0675\ \text{m}^{2} \\ \text{plants/ha} &= \frac{10{,}000}{0.0675} \approx 148{,}148 \end{aligned} \]
The distractors come from other spacings: 111111 is the population at 45 cm by 20 cm (or 30 cm by 30 cm), and 83333 is 60 cm by 20 cm. 122122 matches no standard spacing.
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