Question

the total energy available to the third trophic level organisms if ecosystem is supported by 10 lakh j light energy will be ??​

Answer 1

10 lakh Joule = 1000000 Joule is available as Light energy from Sun.

• Now, 1% of it will be utilised by the plants (1st Trophic Level) = $1\%\times 10^{6}$ = 10⁴ Joule.

• The herbivores (2nd Trophic Level) will utilise 10% of 10⁴ energy (as per 10% Rule) = 10% × 10⁴ = 10³ Joule.

• Now, Third Trophic Level (Carnivores) will utilise 10% of 10³ Joule = 10² Joule.

3rd Trophic Level will get 10² or 100 Joules !

Answer 2

Explanation:

10 lakh Joule = 1000000 Joule is available as Light energy from Sun.

Now, 1% of it will be utilised by the plants (1st Trophic Level) = 1\%\times 10^{6}1%×10

6

= 10⁴ Joule.

The herbivores (2nd Trophic Level) will utilise 10% of 10⁴ energy (as per 10% Rule) = 10% × 10⁴ = 10³ Joule.

Now, Third Trophic Level (Carnivores) will utilise 10% of 10³ Joule = 10² Joule.

3rd Trophic Level will get 10² or 100 Joules !