Tom researches the weights of plant seeds - OCR - GCSE Maths - Question 2 - 2019 - Paper 6

To determine the lightest seed, we need to convert all weights into the same unit for comparison.

First, we convert the weights of the seeds:

1. Poppy Seed:

   • Weight: $3 \times 10^{-4}$ grams.

2. Pumpkin Seeds:

   • Total weight: 21 grams for 250 seeds.
   • Weight per pumpkin seed:

   $\frac{21}{250} = 0.084 \text{ grams}$

3. Sesame Seed:

   • Weight: $3.64 \times 10^{6}$ kilograms = $3.64 \times 10^{9}$ grams (since 1 kg = 1000 grams).

Now we compare:

• Poppy seed: $3 \times 10^{-4}$ grams
• Pumpkin seed: $0.084$ grams
• Sesame seed: $3.64 \times 10^{9}$ grams

Thus, from the lightest to the heaviest, the order is:

• Poppy seed
• Pumpkin seed
• Sesame seed