Answers SY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

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

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?

to improve the variability of her data

to prevent other people from using the data incorrectly

to help in arriving at a conclusion even with inaccurate data

to reduce the likelihood of errors in the experiment

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.

freckles with curly hair

freckles with straight hair

no freckles with curly hair

no freckles with straight hair

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

Impact on growth and development

Extinction

Change in competition

Loss of habitat

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

The bananas had a lack of genetic variation.

The fungus had a lack of genetic variation.

The bananas were not resistant to weed killer.

The fungus was not resistant to weed killer.

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

air.

water.

daisies.

fertilizer.

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

using prior knowledge to solve problems

requiring evidence and thinking logically

taking a closer look at the natural world

following strict rules when using human test subjects

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

requires modification of DNA

involves the production of offspring

can be done with plants

may result in potential risks

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

Z, X, Y

Y, Z, W

W, X, Z

Y, Z, X

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

community

niche

environment

ecosystem

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.

controlling insect populations

sharing a habitat with insects

having pitcher-shaped leaves

being a unique type of plant

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

Some members of a population survive and reproduce, their environment or location changes, and favorable traits are passed on to offspring.

A population’s environment or location changes, some members survive and reproduce, and favorable traits are passed on to offspring.

Favorable traits are passed on to offspring in a population, some members survive and reproduce, and the environment or location changes.

Some members of a population survive and reproduce, favorable traits are passed on to offspring, and their environment or location changes.

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

The size of a population usually stays high due to its carrying capacity and limiting factors.

The size of a population usually stays near its limiting factors due to carrying capacity.

The size of a population usually stays near its carrying capacity due to limiting factors.

The size of a population usually stays low due to its carrying capacity and limiting factors.

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?

348

360

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

autotrophic omnivore

heterotrophic omnivore

autotrophic herbivore

heterotrophic herbivore

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

nonnative species introduction and the burning of fossil fuels

deforestation and the burning of fossil fuels

deforestation and nonnative species introduction

non-sustainable harvesting and nonnative species introduction

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

30 individuals emigrate, 30 individuals die, 30 individuals are born, 0 individuals immigrate

22 individuals emigrate, 10 individuals are born, 12 individuals immigrate, 0 individuals die

15 individuals immigrate, 9 individuals emigrate, 6 individuals are born, 0 individuals die

18 individuals immigrate, 20 individuals die, 1 individual is born, 0 individuals emigrate

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?

Since the new discovery contradicts the theory, the theory would be replaced or dismissed.

Since the new discovery adds to current knowledge, the theory would be modified.

Since the new discovery presents evidence that supports the theory, the theory would be further supported.

Since the new discovery disproves the theory, the theory would need to be modified into a law.

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

Option

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

If the power of 10 is positive, move the decimal point to the left.

If the power of 10 is positive, move the decimal point to the right.

If the number being converted is greater than 10, move the decimal point to the left.

If the number being converted is greater than 10, move the decimal point to the right.

Which action has a positive effect on air resources?

using fossil fuels

building new homes

walking to work or school

removing vegetation such as trees

Question text not available

a row in which no fertilizer is used

a row in which 12 grams of fertilizer are used

a column that shows how the dependent variable changes

a column that shows how the independent variable changes

In which parts of the cell cycle would chromosomes be paired up? Check all that apply. interphasemetaphase Ianaphase IItelophase IImetaphase IItelophase I

interphase

metaphase I

anaphase II

telophase II

metaphase II

telophase I

A cleft chin is a dominant trait. One parent is heterozygous for cleft chin, and the other parent does not have a cleft chin.

1 out of 4

2 out of 4

3 out of 4

4 out of 4

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