AnswersSY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

Unit Test — Cumulative exam Answers

1 verified answers
1
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A mosquito has a diploid number of 6. How many chromosomes are in the sperm of a mosquito?

A
3
B
6
C
12
D
24
2
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Alicia conducted an experiment to find out which insulating material holds in the most heat. She did multiple trials of each test and recorded observations of each trial.Why did Alicia do more than one trial?

A
to improve the variability of her data
B
to prevent other people from using the data incorrectly
C
to help in arriving at a conclusion even with inaccurate data
D
to reduce the likelihood of errors in the experiment
3

Having freckles is dominant over not having freckles, and curly hair is dominant over straight hair. One parent is homozygous for freckles and has straight hair. The other parent does not have freckles and has straight hair.

A
freckles with curly hair
B
freckles with straight hair
C
no freckles with curly hair
D
no freckles with straight hair
4

Dan drew a diagram to compare the effects of human-induced environmental changes on organisms and species.

Question illustration
A
Impact on growth and development
B
Extinction
C
Change in competition
D
Loss of habitat
5

In the 1950s, a fungus nearly wiped out an entire species of bananas that were produced through cloning.

A
The bananas had a lack of genetic variation.
B
The fungus had a lack of genetic variation.
C
The bananas were not resistant to weed killer.
D
The fungus was not resistant to weed killer.
6

Chet plans an experimental investigation to see how well a new fertilizer works on daisies. The fertilizer must be dissolved in water and delivered to the plants by spraying it onto the leaves and stems.To set up his control group for the experiment, Chet should leave out the

A
air.
B
water.
C
daisies.
D
fertilizer.
7

Which action would best demonstrate that a scientist is being creative?

A
using prior knowledge to solve problems
B
requiring evidence and thinking logically
C
taking a closer look at the natural world
D
following strict rules when using human test subjects
8

Sherry draws a diagram to compare selective breeding and genetic engineering.

Question illustration
A
requires modification of DNA
B
involves the production of offspring
C
can be done with plants
D
may result in potential risks
9

Consider how to complete this timeline to show the order in which different evolutionary ideas were developed.

Question illustration
A
Z, X, Y
B
Y, Z, W
C
W, X, Z
D
Y, Z, X
10

Which term best describes all of the populations living together in a particular area?

A
community
B
niche
C
environment
D
ecosystem
11

The tropical pitcher plant is a unique plant that obtains its nutrition by digesting insects. The plant traps insects in its pitcher-shaped leaves and dissolves them as part of the digestion process. Tropical pitcher plants grow in warm, moist places in which the soil is poor in nutrients. Because of their feeding habits, pitcher plants are able to control the insect populations in the areas in which they live.

A
controlling insect populations
B
sharing a habitat with insects
C
having pitcher-shaped leaves
D
being a unique type of plant
12

According to Darwin’s theory of evolution, in which order do the steps of natural selection happen?

A
Some members of a population survive and reproduce, their environment or location changes, and favorable traits are passed on to offspring.
B
A population’s environment or location changes, some members survive and reproduce, and favorable traits are passed on to offspring.
C
Favorable traits are passed on to offspring in a population, some members survive and reproduce, and the environment or location changes.
D
Some members of a population survive and reproduce, favorable traits are passed on to offspring, and their environment or location changes.
13

Which best describes the relationship between population size, carrying capacity, and limiting factors?

A
The size of a population usually stays high due to its carrying capacity and limiting factors.
B
The size of a population usually stays near its limiting factors due to carrying capacity.
C
The size of a population usually stays near its carrying capacity due to limiting factors.
D
The size of a population usually stays low due to its carrying capacity and limiting factors.
14

An adult panda bear must eat at least 30 pounds of bamboo in a day. There are 12 adult pandas living in part of a bamboo forest.How many pounds of bamboo, at minimum, must be available each day in order to support the population of pandas?

A
12
B
30
C
348
D
360
16

White-tailed deer eat green plants, acorns, fruits, nuts, and twigs.Which describes the role of a white-tailed deer?

A
autotrophic omnivore
B
heterotrophic omnivore
C
autotrophic herbivore
D
heterotrophic herbivore
17

Which two human activities are believed to be the greatest contributors to global warming?

A
nonnative species introduction and the burning of fossil fuels
B
deforestation and the burning of fossil fuels
C
deforestation and nonnative species introduction
D
non-sustainable harvesting and nonnative species introduction
18

Which scenario would result in a positive population growth?Use this formula: population growth = (birth rate + immigration) – (death rate + emigration)

A
30 individuals emigrate, 30 individuals die, 30 individuals are born, 0 individuals immigrate
B
22 individuals emigrate, 10 individuals are born, 12 individuals immigrate, 0 individuals die
C
15 individuals immigrate, 9 individuals emigrate, 6 individuals are born, 0 individuals die
D
18 individuals immigrate, 20 individuals die, 1 individual is born, 0 individuals emigrate
19

The kinetic molecular theory states that all matter is made up of atoms that are in continuous random motion. If a scientist discovered that several atoms seemed to move in a predictable pattern, what is the likely effect of this discovery on the kinetic molecular theory?

A
Since the new discovery contradicts the theory, the theory would be replaced or dismissed.
B
Since the new discovery adds to current knowledge, the theory would be modified.
C
Since the new discovery presents evidence that supports the theory, the theory would be further supported.
D
Since the new discovery disproves the theory, the theory would need to be modified into a law.
20

Which timeline shows the correct order of contributions made to the discovery of DNA?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
21

Which describes the correct procedure when converting a number from scientific notation to standard notation?

A
If the power of 10 is positive, move the decimal point to the left.
B
If the power of 10 is positive, move the decimal point to the right.
C
If the number being converted is greater than 10, move the decimal point to the left.
D
If the number being converted is greater than 10, move the decimal point to the right.

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