Life Science Ecosystems Quiz 1.2 1

Name Date

Science Class

Grade 7 Life Science Ecosystems Quiz 1.2 PRACTICE

Part 1 Review-- Percent air in soil

Q1practice. I want to calculate the percent of air in a sample of soil. To do this, I put 200mL of

soil in a beaker, then add 180mL of water. The resulting volume is 350mL. What is the percent

of air in this sample of soil? Show your work.

Part 2 Microscopy

Q2practice. Each lens in a microscope is marked with a number, like 10X, that shows how much

magnification it has. In a compound microscope, where the eyepiece lens magnifies 15X and the

objective lens magnifies 20X, what is the total magnification? Show your work.

Q3practice. As you try to examine a slide, you turn the coarse adjustment knob and the fine

adjustment knob, but still the image is not good. What else can you do to improve the image?

Life Science Ecosystems Quiz 1.2 2

Part 3 Classification

Use the following word bank to answer questions about tree classification.

Tree type deciduous coniferous

Branch pattern alternate opposite

Leaf type flat/broad needle-like scaly

Leaf shape simple lobed

Leaf proportions symmetric not symmetric

Leaf vein pattern palmate pinnate

margins smooth wavy toothed notched

Q4practice. The following figure shows two species of trees, Ash and Redbud. In what four ways

could they be classified the same? Select your answers from the word bank.

Apple Tree (Malus pumila) Redbud Tree (Cercis canadensis)

Life Science Ecosystems Quiz 1.2 3

Q5practice. I want to plant a fruit tree in my yard. Apricots are my favorite. There is a sale at my

local gardening store of young fruit trees, but all the labels have faded. None of the trees is old

enough to have fruit yet. How can I be sure that the tree I select to buy is an apricot, and not one

of the other kinds of fruit trees on sale and pictured below? Give me your answer, with at least

two reasons why you think you are right. Use words from the word bank, along with other

visible differences.

American Plum

(Prunus Americanan)

Bartlett Pear

(Pyrus communis)

Black Cherry

(Prunus serotine)

Apricot

(Prunus armeniaca)

Q6practice. The figure here shows the classification of four species of animals.

Life Science Ecosystems Quiz 1.2 4

a. According to this chart, what does the Fire Ant have in common with the Japanese

Beetle?

b. Would the Fire Ant and the Japanese beetle be able to interbreed? Defend your answer,

using information from this table.

Figure 1. American Black Bear

Greater Flamingo

Fire Ant Japanese Beetle

Kingdom Animalia Animalia Animalia Animalia

Phylum Chordata Chordata Arthropod Arthropoda

Class Mammalia Aves Insecta Insecta

Order Carnivora Phoenicopteriformes Hymenoptera Coleoptera

Family Ursidae Phoenicopteridae Formicidae Scarabaeidae

Genus Ursus Phoenicopterus Solenopsis Popilla

Species americanus roseus Geminate Japonica

Binomial

name

Ursus americanus Phoenicopterus

roseus

Solenopsis geminata Popillia japonica

Part 4 Scientific Method

Ellie and May want to start a small business growing apples

Life Science Ecosystems Quiz 1.2 5

organically. They find out that an apple tree takes about 6 years

to start producing, but then it can yield over 200 pounds of fruit

each season. Apple trees also live a long time, about 60 years,

without needing to be replaced. Ellie and May are considering

which of four kinds of apples to grow—Delicious, Gala,

MacIntosh, or Honey Crisp. Before they make their investment,

though, they decide to find out which of these apples is most

popular for flavor, and also which sells for the highest price at

their local market.

Q7practice. What is the guiding question for this investigation?

Q8practice. What is a suitable hypothesis?

Q9practice. Identify the independent variable(s).

Q10practice. Identify the dependent variable(s).

Q11practice. What are two controls that need to be in place to make this investigation a fair one?

Q12practice. Here is (fake) data related to this investigation. Which apple would you advise Ellie

and May to grow? Use information from this table to justify your answer.

Life Science Ecosystems Quiz 1.2 6

Delicious Gala MacIntosh Honey Crisp0

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$1.30 $1.40 $1.25 $1.20

Apple Research

taste rating (higher is better) price per pound ($)

type of apple

tast

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d se

lling

pric

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