Topic 5 - Ecosystems

All organic molecules have what element in common?

• phosphorus

• nitrogen

• carbon

• sulfur

Tags

NGSS.HS-LS1-6

Take a deep breath in, take a deep breath out. Most of the gas that just passed through your mouth was... (what most of the air is made of)

• carbon dioxide

• oxygen

• nitrogen

• water vapor

The burning of fossil fuels by cars and factories has most affected the ______________ cycle.

• hydrogen

• nitrigen

• water

• carbon

All living things use nitrogen to

• make proteins

• reproduce

• make sugar

• transport water

Tags

NGSS.MS-LS2-1

An aquatic food web consists of phytoplankton → krill → seals → sharks. The removal of which component is MOST LIKELY to cause an immediate impact on the food web?

• sharks

• seals

• krill

• phytoplankton

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The process of respiration is essential in the oxygen/carbon dioxide cycle. Respiration removes ______ from the atmosphere and produces and releases ______ to the atmosphere.

• carbon dioxide, oxygen

• oxygen, carbon dioxide

• oxygen, glucose

• glucose, oxygen

Tags

NGSS.MS-LS1-2

The snake that eats the frog in this food chain is called a

• primary producer.

• primary consumer.

• secondary consumer.

• tertiary consumer.

Tags

NGSS.MS-LS2-2

Consider the model of the food chain. Imagine a local farm has dumped excess pesticides in the pond used for irrigation. This will impact the food chain in the pond in ALL BUT ONE way. That is

• the algae growing in the pond will die out.

• the algae will grow thicker in the pond.

• the fish populations will drop.

• fishing will not produce much positive results.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A food web shows who eats who in any given habitat. Every living thing, from one-celled algae to giant blue whales, needs food to survive. Each food web is a possible pathway that energy and matter can follow through the habitat. A food web begins with producers: organisms that convert sunlight into usable chemical energy. The food web is completed by the decomposers who turn organic wastes, such as decaying plants, into inorganic materials, such as nutrient-rich soil. Decomposers complete the cycle of life, returning nutrients to the soil or oceans for use by producers.

In this food web, identify the decomposer.

• nematodes

• grass plants

• bacteria

• arthropods

Tags

NGSS.MS-LS2-3

Which is an accurate description of the growth of a natural animal population?

• It continues to grow indefinitely.

• It is limited by environmental factors.

• It is genetically determined.

• It never changes.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

NGSS.MS-LS4-4