Biology · Environmental Studies

Ecosystem Nutrition and Energy Flow

1,093 Questions

Ecosystem nutrition and energy flow questions cover trophic levels, food chains, and biodegradable materials. These concepts frequently appear in general science sections of major competitive exams. Review these questions to build a solid understanding of ecological interactions.

Trophic levels conceptFood chain orderAutotrophic nutritionEnergy assimilationScavengers and decomposers

Ecosystem Nutrition and Energy Flow Questions

Multiple choice

Plants are _________________ in our ecosystem.

  1. decomposers

  2. producers

  3. consumers

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants are producers because they produce their own food using sunlight, water, and carbon dioxide through photosynthesis.

Multiple choice

Which part of a food chain absorbs the Sun's energy?

  1. decomposers

  2. primary consumers

  3. secondary consumers

  4. producers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Producers (plants) are the base of the food chain because they capture solar energy through photosynthesis and convert it into chemical energy.

Multiple choice

When an organism containing carbon dies, how does the carbon return to the atmosphere?

  1. when consumers eat the dead organism, CO2 is released

  2. when decomposers consume them, CO2 is released

  3. the carbon bonds with the soil and becomes CO

  4. it does not return, the carbon is lost forever
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decomposers, such as bacteria and fungi, break down organic matter from dead organisms, releasing carbon back into the atmosphere as carbon dioxide through cellular respiration.

Multiple choice evs - i issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

Living things interact with ________ constantly.

  1. Organisms

  2. Environment

  3. Non-living things

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Environment is living things and what is around them. It includes physical, chemical and other natural forces. Living things do not simply exist in their environment. They constantly interact with it. Organisms change in response to conditions in their environment. In the environment, there are interactions between plants, animals, soil, water, temperature, light and other living and non-living things. 

Multiple choice commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

How many of the following will act as a decomposer in a pond ecosystem?
[spider, earthworm, woodlouse, fungus]

  1. One

  2. Two

  3. Three

  4. Four
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decomposers are the organisms which feed on dead organisms such as microbes. Spider feeds on other insects and acts as a predator and woodlouse found in forest and feeds on plant matter from the forest floor. Whereas earthworm and fungus can grow in pond water and feeds on dead organisms (plant or animal).

So, the correct answer is 'Two'.

Multiple choice evs - i issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

Biotic components include

  1. Only producers

  2. Producers, consumers and decomposers

  3. Only consumers

  4. Only producers and consumers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The biotic components of an ecosystem are the lifeforms that inhabit it. The life forms of an ecosystem aid in the transfer and cycle of energy. Examples of biotic components are producers and consumers. There are three main types of consumers: herbivores, carnivores and omnivores. 

Therefore, the correct answer is option D.

Multiple choice zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

Primary consumers have more ................ than the secondary consumers.

  1. Bioaccumulation

  2. Calorific value

  3. Population density

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The accumulation of chemicals in the living cells is known as bioaccumulation. When there is excessive use of the pesticides for the protection of fruits and vegetables against the harmful pests, this may lead to its accumulation in the food products. When these products are consumed, the chemicals deposit in the fatty tissues of the host. The concentration of the chemicals goes on reducing with the increase in the trophic level of the consumers. So, the primary consumers will have more bioaccumulation than the secondary consumers. 

Thus, the correct answer is option A.

Multiple choice botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

Organisms called, methanogens are most abundant in all except

  1. Hot spring

  2. Polluted stream

  3. Cattle yard

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Microorganisms that produce methane as a by-product of its metabolic activities is known as methanogens. They are classified either as bacteria or archaea, these anaerobic organisms are commonly found in wetlands creating the marsh gas, digestive tracts of human beings and animals, marine sediments and hot springs.

Thus, the correct answer is option D.

Multiple choice biology human system gas exchange and smoking gas exchange gas exchange in humans

Which of the following process is responsible for the release of carbon dioxide by the animals?

  1. Respiration

  2. Digestion

  3. Photosynthesis

  4. Reproduction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • During cellular respiration, glucose and oxygen are changed into energy and carbon dioxide. 
  • Therefore, carbon dioxide is released into the atmosphere during the process of cellular respiration. Hence, respiration is responsible for the release of carbon dioxide by animals.
So, the correct answer is 'respiration'.