first test of year 7

Question 1

organisms

Answer 1

things that have all the characteristics of life

Question 2

cell

Answer 2

smallest unit of life

Question 3

unicellular

Answer 3

living things that are made of only one cell

Question 4

multicellular

Answer 4

living things that are made up of two or more cells

Question 5

homeostasis

Answer 5

an organism’s ability to maintain steady internal conditions when outside conditions change

Question 6

binomial nomenclature

Answer 6

gives each organism a two word specific name

Question 7

species

Answer 7

a group of organisms that have similar traits and are able to produce fertile offspring

Question 8

genus

Answer 8

group of similar species

Question 9

dichotomous key

Answer 9

a series of descriptions arranged in pairs that leads you to the identification of an unknown organism

Question 10

cladogram

Answer 10

a branched diagram that shows relationships among organisms, including common ancestors

Question 11

light microscope

Answer 11

uses light and lenses to enlarge an image of an object

Question 12

compound microscope

Answer 12

a light microscope that uses more than one lens to magnify an object

Question 13

electron microscope

Answer 13

uses a magnetic field to focus a beam of electrons through an object or onto an object’s surface

Question 14

What characteristics do all living things share?

Answer 14

All living things have cells, can grow and develop, reproduce, respond to stimuli, maintain homeostasis, organization, and use energy.
cells- smallest unit of life and unicellular/multicellular
grow and develop- increase in size and as cell grows bigger
reproduce- organism makes another asexual- one parent sexual- two
respond to stimuli- reacting to changes- internal such as hungry- external such as getting tan
maintain homeostasis- able to maintain steady internal conditions when something changes
use energy- everything you do use energy
organization- all livings have structures that have specific functions

Question 15

Why are things classified?

Answer 15

We classify things because it makes it easier to study different organisms. It also helps us understand and classify new organisms.

Question 16

What is the classification system for all living things?

Answer 16

The classification system for all living things is
kingdom-
Phylum-
class-
Order-
Family-
Genus-
species.

Question 17

Why does every species have a scientific name? What is this system called?

Answer 17

The scientific naming system is called binomial nomenclature, and we have scientific naming because it is an universal naming system and it makes it easier to communicate worldwide.

Question 18

What are the two classification tools used in classifying organisms? How are they used?

Answer 18

Dichotomous keys and cladograms are used to classify organisms. Pg. 22-23 for examples
dichotomous keys- descriptions that lead scientists to identification of unknown organism
cladogram- branched diagram that shows the relationships between organisms, including common ancestors

Question 19

How did microscopes change our ideas about living things?

Answer 19

Microscopes changed our ideas about living things because we can observe things more accurately and from a closer view. We can understand microscopic organisms and small things better because we can actually see and study them.

Question 20

What are the two types of microscopes?
How are they different?

Answer 20

The two types of microscopes are light microscopes and electron microscopes. They are different because light microscopes use lenses and light to enlarge an image, and electron microscopes use a magnetic field and produce 3d images.

Question 21

How are microscopes used?

Answer 21

Microscopes are used to enlarge images and see things closer. Today, we use microscopes in healthcare and crime labs, and jewelers and paleontologists use them as well.