Which of the following statements about ecosystems is false?
All the energy entering the ecosystem is passed on to decomposers
The primary producers provide energy for herbivores and carnivores
Ecosystems must start with the capture of energy by autotrophs
Energy transfer from one trophic level to the other is not 100% efficient
Correct answer is A
No explanation has been provided for this answer.
Which of the following organisms is an endoparasite?
Mice
Mosquito
Ascaris
Dodder
Correct answer is C
No explanation has been provided for this answer.
An organism whose source of carbon is inorganic is likely to be a/an
heterotrophic organism
autotrophic organism
symbiotic organism
parasitic organism
Correct answer is B
No explanation has been provided for this answer.
Pepsin is secreted as an inactive precursor called pepsinogen because
pepsin as an enzyme is quickly destroyed by the alkaline food from the mouth
all digestive enzymes pass through a precursor stage
pepsin is a proteolytic enzyme and might attack the stomach tissues
pepsin is not required in large quantities
Correct answer is B
No explanation has been provided for this answer.
Which of the following treatments would increase the rate of transpiration in a potted plant?
Placing it in a cold room
Placing it under a fan in a room
Putting it in a cupboard
Smearing grease on the lower surface of the leaves
Correct answer is B
No explanation has been provided for this answer.