Question : The pyramid of numbers in an aquatic ecosystem is _________.
Option 1: always inverted
Option 2: always upright
Option 3: partially inverted
Option 4: spindle-shaped
Correct Answer: always upright
Solution : The correct option is always upright.
In many aquatic ecosystems, the pyramid of numbers is mostly upright, meaning that the number of individuals at each trophic level is the same. The number of producers is somewhat similar to the number of consumers. This may occur in ecosystems with a relatively balanced ratio of producers to consumers.
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Question : In which of the following ecosystems benthic zone is found?
Option 1: Freshwater ecosystem
Option 2: Saltwater ecosystem
Option 3: Tundra ecosystem
Option 4: Forest ecosystem
Question : The total surface area of a square-based right pyramid is 1536 m2, of which 37.5% is the area of the base of the pyramid. What is the volume (in m3) of this pyramid?
Option 1: 3048
Option 2: 3072
Option 3: 3144
Option 4: 3108
Question : The sum of three consecutive odd numbers is always divisible by ____.
Option 1: 3
Option 2: 9
Option 3: 15
Option 4: 21
Question : If the square of the sum of two numbers is equal to 4 times their product, then the ratio of these numbers is:
Option 1: 2 : 1
Option 2: 1 : 3
Option 3: 1 : 1
Option 4: 1 : 2
Question : A concave lens forms an image which is:
Option 1: real and erect
Option 2: virtual and erect
Option 3: real and inverted
Option 4: virtual and inverted
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