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Interactions of Living Things ( Worksheets,Definition, & Examples)

Grade 7 Science Worksheets

Step into a realm where the natural world comes alive with connections and relationships that shape the very fabric of life. Our 7th-grade science worksheets on the “Interactions of Living Things” are designed to take you on an exciting journey through ecosystems, adaptations, symbiosis, and more. Just like the intricate threads of a tapestry, living beings are intricately woven together, influencing one another in ways both seen and unseen.

How do organisms depend on each other in an ecosystem?

All living beings that coexist with each other like plants, animals, people, forming a habitat using the essential resource of nature like air, water, soil, and rocks makes up an ecosystem.

Living Elements and Non-Living Elements are called Biotic and Abiotic respectively.

Biotic include plants, animals, and human beings.

Abiotic include resources like air, water, soil and rocks.

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Interactions of Living things

Basic things needed for the survival all living things –

  • Air
  • Water
  • Food
  • Shelter
  • Ability to respond and in the ecosystem
Interactions of Living things – Grade 7 Science Worksheets
Interactions of Living things – Grade 7 Science Worksheets


Any living thing like plant or animal is termed as an organism.



A group of organisms of the same set of species, plant or animal is said to be population.

Interactions of Living things – Grade 7 Science Worksheets

Credit: https://www.thinglink.com/scene/707599217928962049


A community is a geographic area where many set of populations of plants and animals live and co-exist together.


Ecology is the understanding of the relationships between living organisms and their surroundings.

Adapting to the Environment

  • Natural selection is a tendency of a living being to adapt itself to an environment, eventually learning to live there and give birth to young ones.
  • With necessary and favorable changes in behaviors and physical characteristics with respect to climate, availability of food and water, the organism learns to live in a particular place making that its Natural selection.

For example: a chameleon has learnt to adapt its environment by changing colors according to the surface it is standing.

  • Niche is a particular role played by an organism in its habitat and how it makes its living.
Interactions of Living things – Grade 7 Science Worksheets
Interactions of Living things – Grade 7 Science Worksheets

What are the interactions between the levels of biological communities?

There are three types of interactions among organisms –

  • Competition
  • Predation
  • Symbiosis 


  • It is the struggle between organisms as they attempt to use the same limited resource.
  • Occurs when two species are in the same niche.
  • Two species cannot share the same niche.

If two species occupy the same niche, they will be a competition to each other and one will species will become more powerful and destroy the other.


The relationship where one kills the other for food is called predation. The organism that kills is the predator. The organism that is killed is the prey.

Interactions of Living things – Grade 7 Science Worksheets

Predation and Population Size

  • If death rate is more than the birth rate, then population size decreases
  • If birth rate more than the death rate, then population size increases
  • When the death rate is more than the birth rate, the population of the prey decreases, . When this happens, the predators go without food and the predator population decreases.
  • Predator and prey populations always fluctuate.

Here in this picture, every animal is a prey to the next animal and it also is a predator to the organism in front of it. It is also an example of food chain in animals

Adaptations of a predator

  • Help them catch and kill prey.
  • Cheetah’s speed helps it to run very fast in a very short time.
  • Some scorpions and snakes when attack their prey have a venom that numbs the body of tiny animals like frogs and lizards.
Interactions of Living things – Grade 7 Science Worksheets

Adaptations of a prey

  • Prevent them from becoming prey.
  • Speed and alertness of a mouse protects it from its predators like snake and eagles and owls.
  • Smelly spray of a skunk.


Organisms within a community do interact with each other in many ways. Some are predators, some are prey. Some have a tendency to compete with one another, some coexist. Some species form symbiotic relationships with other species.


Mutualism is when both parties are benefited in a particular relationship. There are a huge variety of such co existences.

Interactions of Living things – Grade 7 Science Worksheets

For example, pollination, pollinators, such as bees and birds, sit on plants obtain nectar from them and in return carry pollen, which gets stuck on their bodies that the plants need for fertilization. Very much mutualistic, both the parties benefit.

  • Cleaning symbiosis: In such relationships, one removes and cleans parasites and tiny worm organisms off another organism, which in turn provides a source of food. In return, the larger animal helps the cleaning animal to move around, here, the first organism provides not only food but transportation for the second organism. And the larger animal gets nicely cleaned up.
  • Defense symbiosis: The clownfish and sea anemones in the large ocean share such a defensive relationship. The clown fish lives between the tentacles of sea anemones. They are of stingy nature, but it does no harm to the clownfish and its family. Because of this, clownfish lives in the safety of its tentacles while in return they protect the anemone from its predators. So here, both provide defense or protection.


Commensalism is an involvement between two different species where one species enjoys a benefit, and the other does not. For example, the cattle heron and little birds along with it go wherever the cattle and buffalo go and other herbivores as they graze. The birds eat the small insects and the worms when cattle graze around. In this relationship the birds benefits very much, but the cattle have no such benefit. 

Interactions of Living things – Grade 7 Science Worksheets


Parasitism is a relationship between two organisms where one is overly benefited, and the other is very much harmed. The parasite takes advantage of the other from the relationship, by harming the host.

Anything that is benefited while the other is harmed is considered a parasite. A mosquito is a parasite. While some of other parasites that affect humans are such as lice or bugs.

Parasites are divided by the type of interaction they have with their host. Parasites are much smaller than their hosts and reproduce very fast.

Ectoparasites are ones that breed and live on their hosts.

Examples: lice, mites. These parasites live on larger animals, like cats, dogs and deer.

Endoparasites are the ones that live inside their host.

Example: worms, bacteria and viruses.  Worms which live inside our body, like tape worms and pin worms. Mostly they live inside the large intestine.

Interactions of Living things – Grade 7 Science Worksheets

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Check Point                                                                                  

Fill in the blanks:

  1. The study of the relationships between living organisms and their environment is called…………………….
  2. A group of organisms belonging to the same species, either plant or animal is called ………………….
  3. A geographic area where several populations of plants and animals live is called……………..
  4. …………………….. is the role of an organism in its habitat, or how it makes its living.
  5. ………………………. is the struggle between organisms as they attempt to use the same limited resource
Answer Key
  1. Ecology
  2. Population
  3. Community
  4. Niche
  5. Competition
What are interactions among living things?

Interactions among living things refer to the relationships and connections that organisms have with each other within ecosystems. These interactions can be cooperative, competitive, or symbiotic in nature.

What is the significance of studying interactions among living things?

Studying interactions among living things helps us understand how ecosystems function, how organisms adapt to their environments, and how the balance of nature is maintained. It provides insights into the complexities of life on Earth.

What are some examples of interactions among living things?

Examples include predator-prey relationships, where one organism hunts and consumes another for food; mutualism, where two species benefit from each other; parasitism, where one species benefits at the expense of another; and competition, where different species vie for the same resources.

How do interactions shape ecosystems?

Interactions shape ecosystems by influencing population sizes, distribution of species, and the flow of energy and nutrients. They determine which species thrive, which struggle, and how the overall ecosystem maintains its equilibrium.

What is a food chain?

A food chain is a linear representation of how energy and nutrients are transferred from one organism to another through their consumption. It typically starts with a plant or other producers and progresses through various levels of consumers.

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