IGCSE Biology Paper-2: Specimen Questions with Answers 64 - 66 of 203
Question 64
Question MCQ▾
The diagram shows the external features of an animal.
To which group does the animal belong?
Choices
Choice (4) | |
---|---|
a. | Mollusca |
b. | Arthropods |
c. | Annelids |
d. | Nematodes |
Answer
a.Explanation
Octopuses is a cephalopod Mollusca of order Octopoda. It has two eyes and eight arms. An octopus has a beak or rostrum in the center of arms and it has no internal and external skeleton.
Question 65
Question MCQ▾
Which gas abundantly occurs in atmosphere?
Choices
Choice (4) | |
---|---|
a. | Oxygen |
b. | Hydrogen |
c. | Nitrogen |
d. | Carbon di oxide |
Answer
c.Explanation
Nitrogen forms about 78% of earth atmosphere, which is the most abundant uncombined element. Some compounds like ammonia, nitric acid, organic nitrates (propellants and explosives) , and cyanides, contain nitrogen.
Question 66
Question MCQ▾
Given diagram shows a terrestrial ecosystem. In such figure the pyramid of energy will be-
Choices
Choice (4) | |
---|---|
a. | Upright |
b. | Intermediate |
c. | Inverted |
d. | Irregular |
Answer
a.Explanation
Pyramid of energy is always upright. In every ecosystem, the energy flows from the producer to the consumer. At each trophic level, substantial portion of energy is lost. Therefore, the amount of energy decreases from the producer level to the consumer level.