The biomass of dry terrestrial vegetation of one square meter of the grove is 200 g.

The biomass of dry terrestrial vegetation of one square meter of the grove is 200 g. Using the ecological pyramid rule, determine how many hectares of the grove are required for a wolf to gain 50 kg (60% water) in the food chain: plants-hare-fox-wolf.

1. In order to determine how many hectares of the grove will be required for the wolf to gain a mass of 50 kg, we find the dry weight of the animal:

according to the condition 60% is water, therefore 100% -60% = 40%.

50/100 * 40 = 20 kg – this is the dry weight of the wolf in kg.

2. According to the rule of the ecological pyramid and based on the food chain: plants-hare-fox-wolf we need 20 kg of a wolf, 200 kg of foxes, 2000 kg of hares and 20,000 kg of plants.

3. We know that each square meter of a grove weighs 200 grams, therefore:

1 * 20,000 / 0.2 = 100,000 m2.

One square meter has 0.0001 hectares, so we need 10 hectares.

Answer: 10 hectares.