A dynamic load on this train bridge is the ___
A dynamic load on this train bridge is the ___
Please, Consider the following:
Read each question carefully. Each question has four possible answers, from which you are to choose the most correct or best answer.
Choose the BEST answer for each question.
Make sure to review your answers before submitting them
Good Luck!
Three types of symbiotic relationships are
A mutual relationship has which of the following characteristics?
Which of the following is a basic human need?
An example of a biotic part of an ecosystem is ...
Tapeworms live inside organisms and feed on the nutrients of the organism they live in and weakens it. A tapeworm is an example of
Organisms in an ecosystem can be classified as producers or consumers. The producers provide food for the consumers. An organism that eats both producers and other consumers is called an
Organisms that eat only producers are known as
Crows are known for eating dead animals. This type of consumer is known as a:
Photosynthesis is the food production process that takes place in this part of the plant
A food chain is a convenient way to show how _________ moves among living things in an ecosystem.
Food chains and food webs are models in science, which visually show us the different relationships within an ecosystem. The primary difference between the food chain and the food web is
All living things need water to live. The water cycle has four main processes. The two processes that return water to the earth are
The two processes that release water back into the atmosphere are
The introduction of a new species to an area will likely negatively impact the native species in that. Scientists call this introduction of new species
Succession is a gradual process within an ecosystem in which some species replace other species. When a forest fire destroys a certain area, regeneration occurs. This is an example of
The first living species to arrive in an area are usually algae and fungus. Together their mutual relationship is visible in the form they can be observed - lichen. Lichen grows on bare rock and is considered to be the
To reduce our ecological footprint, we can
Some species are at risk of no longer existing. This means that they could become
Four organisms in an ecosystem are listed below. What is the correct order for the food chain?
The structure in seed plants that contains an embryo, that will form a new plant is the
The function of the root is to
It is during this stage of the plant reproduction cycle that the seed plant has flowers
A white carnation is placed in a bottle of blue-coloured water. After a couple hours, the white carnation turned blue. Why did this occur?
Soil is a natural resource. The components of soil include organic matter and minerals. When soil contains partly decayed organic matter, it is called
Farmers need to make money when growing crops. Most farmers only grow one type of crop in a particular area. This type of farming is called
Many flowering plants rely on pollinators, such as bees, which are
Plants provide food and they make the food through the process of photosynthesis. In this process
Soil has mineral and organic particles. The three main types soil are
Crop rotation helps to keep soil healthy. Crop rotation is
The three states of matter are
Which of the following would be an example of a heat insulator?
How are particles are arranged in a liquid state of matter?
There are three important ideas that make up the particle model of matter. Which of the following statements is not one of these ideas?
Which of the following energy transfers would be correct?
Solids made of different metals were all heated to 100° C to determine how their volume and length would be affected. Which statement describes the most likely outcome of this experiment?
You board a crowded elevator. Soon after the doors close and the elevator starts to move, you find that you feel uncomfortably warm. Why?
The devices that use winds to produce electricity. Their use is increasing throughout Alberta. What is their source of power?
An experiment testing the effect of heat on different liquids was performed by grade 7 science students. Which of the following variables would have been the manipulated variable?
The thermal energy of a substance is the
When thermal energy is added to a solid the volume of the solid will change. Steel beams bending or even breaking in a bridge, because of an extreme change in temperature are a result of thermal _____
Materials that allow an easy transfer of heat are called
Insulators are rated by their insulating ability. R-value is given to each material that is used in the construction of a building. The best insulating product would have a ____
Which would have more thermal energy: a 10-L pot of soup at 89 degrees Celcius or a 300-mL cup of soup at 89 degrees Celcius?
The transfer of energy in a fluid is very different. The heated particles become less dense and so they rise, with the colder, more dense particles rushing in to take their place. This type of thermal energy transfer creates a ...
A kettle of water is placed on the stove. Heat is transferred through the water by the process of
When the thermal energy from the sun reaches our planet, which method of heat transfer occurs?
There are two types of solar energy heating systems. The system using direct Sun rays is called ____
Natural sources of energy can be renewable and non-renewable. A non-renewable energy source would be
Canadian inventor, Norman Breakey, made a revolutionary invention in 1940. The paint roller served a very important function, which was to paint a large area …
Spider webs are examples of structures that can hold up to 4000 times the weight of the spider that made it. The spider web is a ___
How a structure is put together, how it is shaped and the types of materials that are used to build it are all part of the structure's
The actual effect of a force depends on three things: the magnitude or size of the force; the direction of the force; and _____
The standard unit of measuring force is named after a famous English scientist, who was the first to describe the ‘law of gravitation’, getting the idea for the law as he sat under an apple tree. This unit of measuring force is similar to the amount of force needed to hold an apple in your hand and is called a__
The unit of measuring mass is ___
Identify which structure would have the greatest stability, because of its centre of gravity
A dynamic load on this train bridge is the ___
Three internal forces that are classified by the direction in which they act are
What type of bridge is it?
Structural safety is affected by environmental factors such as
Fixed joints are rigid to prevent any ____________