Quiz about 7th grade Science Review

Question 1

What gas is released by plants from the process of photosynthesis?

Accepted Answer

oxygen

Answer

air

Answer

carbon dioxide

Answer

hydrogen

Question 2

What are the products  (what is made)  of photosynthesis?

Accepted Answer

Glucose and oxygen

Answer

sunlight energy

Answer

carbon dioxide and water

Answer

chlorophyll

Question 3

Which gas is removed from the atmosphere during photosynthesis?

Accepted Answer

carbon dioxide

Answer

hydrogen

Answer

oxygen

Answer

nitrogen

Question 4

A chemical equation is shown below

6CO₂ + 6 H₂O --> C₆H₁₂O₆ + 6O₂

Which observation can be made after analyzing the equation?

Accepted Answer

The number of atoms of each element in the reactants equals the number of atoms of each element in the products

Answer

There are no atoms present

Answer

The number of atoms of each element is increased as the reaction occurs

Answer

The number of atoms of each element is decreased as the reaction occurs

Question 5

A substance that contains only one type of atom is a(n)

Accepted Answer

element

Answer

compound

Answer

heterogeneous mixture

Answer

homogeneous mixture

Question 6

Two or more elements chemically combined:

Accepted Answer

a compound

Answer

an atom

Answer

a mixture

Answer

a pure substance

Question 7

Which of the following represents an element?

Accepted Answer

H2

Answer

H2O

Answer

NaCl

Answer

CaCO3

Question 8

Salt has a chemical formula of NaCl.  Salt is a...

Accepted Answer

Compound

Answer

Element

Answer

Mixture

Answer

None of the Above

Question 9

How many elements are represented in the compound?
Na₂CO₃

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 10

All cells need energy to function.  Which cell organelle is responsible for producing energy in the cell?

Accepted Answer

mitochondria

Answer

chloroplasts

Answer

nucleus

Answer

vacuoles

Question 11

In what part of the plant cell does the process of photosynthesis take place?

Accepted Answer

chloroplasts

Answer

nucleus

Answer

mitochondria

Answer

vacuoles

Question 12

Cells with a nucleus and membrane-bound organelles are called ____________________.

Accepted Answer

eukaryotes

Answer

prokaryotes

Answer

bacteria

Answer

protists

Question 13

A gel-like fluid in which many different organelles are found.

Accepted Answer

cytoplasm

Answer

cell membrane

Answer

nucleus

Answer

organelle

Question 14

The picture below is an example of _________________.

Accepted Answer

diffusion

Answer

osmosis

Answer

isotonic

Answer

active transport

Question 15

When both inside and outside of a cell have the same amount of water it is said that the cell has reached a state of

Accepted Answer

Equilibrium

Answer

Osmosis

Answer

Diffusion

Question 16

What is the definition of  Selective Permeability?

Accepted Answer

The ability of the cell membrane to allow some things to pass through while preventing other things from passing through.

Answer

The movement of materials across the cell membrane that requires NO ENERGY from the cell.

Answer

The movement of materials through (or across) the cell membrane

Answer

The movement of molecules from an area of high concentration (where the molecules are more crowded together) to a area of low concentration (where molecules are more spread apart)

Question 17

Osmosis

Accepted Answer

diffusion of water molecules through a semi-permeable membrane from an area of high concentration to an area of low concentration

Answer

diffusion of water molecules through a semi-permeable mebrane from an area of low concentration to an area of high concentration

Answer

the diffusion of particles from an area of high concentration to an area of low concentration

Answer

the diffusion of particles from an area of low concentration to an area of high concentration

Question 18

Cells of organism must replicate for ?

Accepted Answer

All of the above

Answer

growth

Answer

repair of damaged cells

Answer

replacement of dying cells.

Question 19

Asexual reproduction will result in

Accepted Answer

Identical offspring to the parent

Answer

Twins

Answer

Meiosis

Answer

Non-identical offspring to the parent

Question 20

The purpose of meiosis is to form ________ cells.

Accepted Answer

sex

Answer

body

Answer

somatic

Answer

brain

Question 21

Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.

Accepted Answer

23, 46

Answer

46, 23

Answer

2, 4

Answer

50, 100

Question 22

the passing of genetic traits from parent to offspring.

Accepted Answer

heredity

Answer

trait

Answer

gene

Answer

allele

Question 23

T - tall and t = short
In the punnett square below, what belongs in the missing square

Accepted Answer

tt

Answer

Tt

Answer

Bb

Answer

TT

Question 24

Which statement reflects a way in which asexual reproduction is beneficial?

Accepted Answer

organisms can reproduce without a mate

Answer

it results in genetic variation

Answer

it requires a lot of time and energy

Question 25

Which statement describes why genetic variation is beneficial to populations of organisms?

Accepted Answer

species can better survive environmental changes

Answer

individuals look different from one another

Answer

only one parent is needed to produce offspring

Answer

populations of teh organism increase more rapidly

Question 26

What is an advantage of sexual reproduction?

Accepted Answer

Allows genetic variation

Answer

Only needs one parent

Answer

Happens very quickly

Answer

Offspring are exact copies of parent

Question 27

Why does too much carbon dioxide in the atmosphere cause climate change?

Accepted Answer

It traps heat and warms up our planet.

Answer

It cools down our planet.

Answer

It blocks out UV rays.

Answer

It lets sunlight escape.

Question 28

What does this diagram illustrate?

Accepted Answer

The Greenhouse Effect

Answer

Ozone Layer

Answer

Ultraviolet Radiation

Answer

Layers of the atmosphere

Question 29

What can you do to help slow down global warming?

Accepted Answer

all of the above

Answer

Decrease your carbon footprint by eating locally produced food

Answer

recycle and reuse plastics

Answer

use solar or wind power instead of fossil fuels

Question 30

Nonliving things found in an ecosystem.

Accepted Answer

abiotic factors

Answer

factories

Answer

factor trees

Answer

biotic factors

Question 31

Which of the following is NOT a consumer

Accepted Answer

grass

Answer

dog

Answer

shark

Answer

fish

Question 32

An organism that gets energy from breaking down dead organisms, non-living material or waste

Accepted Answer

decomposer

Answer

producer

Answer

consumer

Answer

autotroph

Question 33

What is the role of decomposers in a food chain?

Accepted Answer

Break down dead organisms and add nutrients to the soil

Answer

Use sunlight to make food

Answer

Eat other organisms to gain energy

Answer

Make the food for the whole food chain

Question 34

A gas

Accepted Answer

has fast-moving particles

Answer

has a definite shape but no definite volume

Answer

has a definite volume but no definite shape

Question 35

Which two subatomic particles make up the nucleus of an atom?

Accepted Answer

Protons and Neutrons

Answer

Protons and Electrons

Answer

Neutrons and Electrons

Answer

Electrons and Protons

Question 36

What charge does the nucleus have and why?

Accepted Answer

positive - the neutrons do not have a charge

Answer

positive - the neutrons and protons are positively charged particles

Answer

neutral - the neutral charge dominates the positive charge

Answer

neutral - electrons cancel out the positive charge of the atom

Question 37

What do the following properties describe? : shiny, ductile, good conductor, high melting point

Accepted Answer

metal

Answer

nonmetal

Answer

metalloid

Question 38

Which of the following describes a mixture?

Accepted Answer

Not chemically combined

Answer

Chemically combined

Answer

Very difficult and often times impossible to seperate

Answer

a chemical reaction takes place

Question 39

Mutations are...

Accepted Answer

Changes in the sequence of DNA

Answer

Broken chromosomes

Answer

Bad genes

Question 40

Mutations can be...

Accepted Answer

All of the Above

Answer

Harmful

Answer

Beneficial

Answer

Neutral

7th grade Science Review

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