Science Final (7th Grade)

Good luck!

What is a cell wall (and its purposes)?

It is a rigid layer that surrounds the cells of plants and some other organisms. A plant’s cell wall helps protect and support the cell.

Why was the microscope invented, and why was it important?

It was invented to magnify small objects and make them have higher resolution. It was important because it led to the development of cell theory.

What is photosynthesis and its products?

It’s the process by which a cell captures energy in sunlight and uses it to make food. Its products include; glucose and oxygen.

Carbon dioxide enters a plant by…?

By entering the plant through small openings on the undersides of the leaves and moving into the chloroplasts.

What phase does cell replication occur in?

Interphase

What combination of sex chromosomes makes a male and female child?

XY is Male, XX is Female

What are the benefits of genetic engineering?

It can produce medicines and improve food crops. It produces organisms with desired traits.

What part of the cell is the “brain”?

Nucleus

Describe the skeletal system - joints, tissues, etc.

Joints are when two bones come together.

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What are the different muscle types?

Cardiac, Skeletal, and Smooth

What is the type of tissue that contracts?

Muscle tissue

Glucose is another name for what?

Sugar

What is the motion of the ball-and-socket joint?

Hip

What is the motion of the hinge joint?

Elbow and Knee

Which one of your muscles never get tired?

Cardiac/ Heart

What causes blood pressure?

The ventricles contracting

What are the points of platelets?

It forms blood clots and scabs to stop bleeding.

What tissue is inside your bones?

Marrow

How are blood types determined?

The marker molecules on your red blood cells.

Atherosclerosis

A condition in which an artery wall thickens as a result of the buildup of fatty materials.

What is a pacemaker?

A group of cells in the right atrium, sends out signals that make the heart muscle contract. The signals regulate heart rate.

Examples of organ systems

Nervous system

circulatory system

Respiratory system

Excretory system

Organ system

Cells, tissue, organ, organ system, organism.

What is a stimulus?

Something that causes a reaction.

What causes the color in your skin?

Melanin

What is a spinal cord?

A thick column of nervous tissue that connects the brain to the peripheral nerves.

What structure in your eye adjusts the size of your pupil?

Iris