SPEED RACE
ROUND 2
ONE EIGHTH CONTEST 2026
Prempeh College - 66 points
West Africa SHS - 30 points
Kumasi Girls’ SHS - 19 points
ONE EIGHTH CONTEST 2026
Keta SHTS - 56 points.
Kadjebi-Asato SHS - 28
Anum Presby SHS - 19
ONE EIGTH CONTEST 2026
Ghana National College - 38points
St. Monica’s SHS - 22points
Presby SHS, Suhum - 16points
QUESTION
What type of pyramid represents the total dry weight of organisms at each trophic level? ANSWER: Pyramid of Biomass
PRACTICE QUESTIONS
1. What does a pyramid of biomass show?
ANSWER: The dry mass of organisms at each trophic level
2. What does a pyramid of numbers show?
ANSWER: The number of organisms at each trophic level
3. Which pyramid is always upright?
ANSWER: Pyramid of energy
4. In what units is biomass often given?
ANSWER: Grams per square metre (dry mass)
5. Why is dry mass used for biomass?
ANSWER: Water content varies and does not count as living material
6. Why may a pyramid of biomass be inverted in an aquatic ecosystem?
ANSWER: Phytoplankton reproduce fast and are eaten quickly
7. Give an example of an inverted pyramid of numbers.
ANSWER: One tree feeding many insects
8. What are trophic levels?
ANSWER: Feeding positions in a food chain
9. About what percentage of energy passes to the next level?
ANSWER: About 10%
10. Which organisms form the base of a pyramid?
ANSWER: Producers
11. In what units is energy in a pyramid given?
ANSWER: kJ per square metre per year
12. How can you measure biomass?
ANSWER: Dry a sample to constant mass and weigh it