Question

Unit - 1
Forests
Activity
TODAY
Row 1
Which leads to...
As you have learnt, cutting down trees actually destroys the whole
environment. This is because everything around us is interdependent One
thing leads to another. A change in one thing leads to a change in another On
with the help of the statements given below. Arrange them for each row in a way
the next page, is a 'Cause and Effect' sheet You need to complete this sheet
that each statement makes a logical connection with an environmental
• Clearing an area of forest enables people to farm the land or for the
Companies want to sell them to people so they need huge areas of land
• As soon as the roads are built, they open up parts of the rainforests that
Une
Forests
Deforestation - Cause and Effect
problem
Row 1
People all over the world want to buy beef products
Many developing countries are poor.
Roads are needed to transport goods
Row 2
country to make money from mining or factories.
for cattle ranches.
Row 2
Which leads to...
12
A
DEFORESTATION
The removal of a forest or large
area of trees and the land being
used for non-forest use.
have never been reached before
Which leads to...
.
Row 3
Trees and plant life is destroyed
• Animals lose their homes or are killed.
Increasing heat in the atmosphere.
Row 3
warmer
Which leads to...
Row 4
The world's trees help to use up carbon dioxide. With fewer trees, there
will be more carbon dioxide and this means the world gets slowly
• Many of our medicines come from rainforest plants. With no trees/plants
to keep the soil fertile it becomes barren and hard. When the rains come
there can be flooding and erosion of the land.
Species become extinct. Less food is available in the remaining forest for
animals. This means that more species die out.
Row 4​

Answer 1

Ecosystem: Definition, Examples, Importance – All About Ecosystems

Last modified on 17thFebruary 2020

What is an ecosystem? The definition of an ecosystem, how it works, how humans affect it and why – find all these issues answered below.

Simple Ecosystem Definition

The simplest definition of an ecosystem is that it is a community or group of living organisms that live in and interact with each other in a specific environment.

For instance, tropical forests are ecosystems made up of living beings such as trees, plants, animals, insects and micro-organisms that are in constant interaction between themselves and that are affected by other physical (sun, temperature) or chemical (oxygen or nutrients) components.

Related: How Does Planting Trees Help Fight Climate Change?

Ecosystem Scientific Definition

An ecosystem is the basic unit of the field of the scientific study of nature. According to this discipline, an ecosystem is a physically defined environment, made up of two inseparable components:

The biotope (abiotic): a particular physical environment with specific physical characteristics such as the climate, temperature, humidity, concentration of nutrients or pH.

The biocenosis (biotic): a set of living organisms such as animals, plants or micro-organisms, that are in constant interaction and are, therefore, in a situation of interdependence.

The concept of < ecosystem > is possible at several scales of magnitude. From multicellular organisms such as insects animals or plants to lakes, mountain ranges or forests to the planet Earth as a whole.

Related: 5 Tips On How To Have A Sustainable Behavior Everyday

What Is A Marine Ecosystem?

Together with freshwater ecosystems, marine ecosystems are also part of the broader category of aquatic ecosystems. Marine ecosystems cover more than 70% of the Earth’s surface and have a high salt content. Some examples of marine ecosystems are offshore systems like the ocean surface, the deep sea, pelagic oceans or the seafloor. But there are also nearshore systems like coral reefs, mangroves or seagrass meadows.

Marine ecosystems can too be characterized following the abiotic and biotic dimensions mentioned above. In this way, its biotic components are organisms and their species, predators, parasites, and competitors. On the contrary, the concentration of nutrients, the temperature, sunlight, turbulence, salinity and density are its abiotic components.

Related: Ocean Protection: 8 Things You Can Do To Help Protect The Oceans

How Do Natural Ecosystems Work?

Natural ecosystems are “balanced” systems. This means the interactions between the different organisms that make up the ecosystem contribute to a certain stability. For example, in grassland ecosystems, herbivores consume grass, but also feed the soil with their droppings, which allows the grass to grow back and allows some sort of balance. Still, this doesn’t mean an ecosystem, even a healthy one, is static. In reality, ecosystems are constantly evolving as they are based on dynamic processes that are constantly changing.

For instance, biocenosis are living organisms that interact with their environment and constantly transform it. How? Because animals compact the soil, plants create humidity or regulate the temperature and bacteria help in the microscopic world by protecting all sorts of animals from diseases and helping in their digestion process. As well, an ecosystem also evolves due to external or unforeseen events. A climatic or natural phenomenon, for example, can lead to transformations in the environment. In this way, biocenosis the ecosystem’s living organisms to adapt to these new constraints, and change happens.

It’s also curious that although an ecosystem is always looking for stability, the ecosystem never perfectly succeeds at it. The various natural imbalances tend to offset each other permanently. Some ecosystems evolve very slowly while others can transform very quickly. Sometimes, in extreme cases, they can even disappear.

How Does Energy Flow In An Ecosystem?

According to the law of energy conservation, energy can neither be created nor destroyed. In fact, it can only be transformed or transferred from one form to another. But how does this work in an ecosystem? How does energy flow here? Let’s watch this video to better understand this phenomenon.

Answered By =shreyash .......