Biology Multiple Choice Questions for Pharmacy Entrance Exams on “Ecosystem – Energy Flow – 2”.
1. What is a group of organisms that transfer food energy through a linear series of processes such as eating and being eaten called?
a) Detritus
b) Food chain
c) Decomposers
d) Producers
Answer: b
Clarification: A group of organisms that transfer food energy through a linear series of processes such as eating and being eaten is known as a food chain. A food chain always proceeds in a progressive straight line and intertwine into food webs.
2. What is a network of food chains interconnecting at various trophic levels and representing feeding relationships within a community called?
a) Food web
b) Decomposers
c) Herbivores
d) Food industry
Answer: a
Clarification: A network of food chains interconnecting at various trophic levels and representing feeding relationships within a community is called a food web. Food webs are formed because of interdependency such that an animal feeds on a plant or on another animal and in turn, becomes food for another.
3. What is the food chain beginning with host and ending with a parasite (ecto as well as endoparasite) called?
a) Detritus food chain
b) Parasitic food chain
c) Grazing food chain
d) Terrestrial food chain
Answer: b
Clarification: A group of organisms that transfer food energy through a linear series of repeated processes of eating and being eaten is called a food chain. The food chain beginning with host and ending with a parasite (ecto as well as endoparasite) is called a parasitic food chain.
4. What are the organisms that cannot manufacture their own food and obtain ready-made organic food from producers called?
a) Decomposers
b) Autotrophs
c) Scavengers
d) Consumers
Answer: d
Clarification: The organisms that cannot manufacture their own food and obtain ready-made organic food from producers are called consumers. These are heterotrophic organisms belonging from second to fifth trophic level.
5. To which trophic level do producers (photosynthesizers or autotrophs) belong?
a) Second
b) Third
c) First
d) Fifth
Answer: c
Clarification: Producers are organisms that make their own food with the help of energy obtained from chemicals or the sun, water, and air. They belong to T1 that is the first trophic level.
6. Which are the three types of consumers?
a) Autotrophs, heterotrophs, and decomposers
b) Herbivores, carnivores, and decomposers
c) Producers, heterotrophs, and decomposers
d) Herbivores, heterotrophs, and carnivores
Answer: b
Clarification: The organisms that cannot manufacture their own food and obtain ready-made organic food from producers are called consumers. The herbivores, carnivores, and decomposers are the three main types of consumers.
7. How many levels do carnivores occupy?
a) 8
b) 1
c) 5
d) 3
Answer: d
Clarification: The carnivores are the organisms that primarily and exclusively feed on other animals (herbivore or carnivore) for energy. They may occupy 2-3 trophic levels in an ecosystem.
8. To which trophic level do top or ultimate carnivores belong?
a) T1
b) T3
c) T4
d) T10
Answer: c
Clarification: The carnivores are the organisms that primarily and exclusively feed on other animals (herbivore or carnivore) for energy. The top or ultimate carnivores belong to T4 or T5 that is the fourth or fifth trophic level.
9. What is the step or division that organisms occupy in a food chain that is characterized by the method of obtaining its nutrition to fulfill its energy requirements called?
a) Trophic level
b) Food chain
c) Food web
d) Food pyramid