PSIA District 2018
The number of bonds that are formed when hydrogen and oxygen combine to yield water.
What is 2?
The elements carbon, hydrogen, and oxygen are parts of many different compounds. This explains why these three elementas can make so many different compounds.
What is they combine in different numbers and ratios?
This process uses carbon from the air to make food for plants.
What is photosynthesis?
During a bright summer day, a student obsreves that a cloud gets smaller and smaller. This is the mostly likely reason the cloud gets smaller.
What is the heat of te sun turning part of the cloud into a gas?
If you cross a white flower (with the genotype pp) with a purple flower (with the genotype PP), this is the possible genotypes of the offspring.
What is all Pp?
Scientists found an organism that can live without water for long periods of time. The scientists made copies of its DNA, then injected this new DNA into corn. This describes the process the scientists used.
What is asexual reproduction?
This is what scientists can learn about the past by studying sedimentary rock.
What is how a species changed over time?
In a meadow ecosystem, mice receive most of the energy they need to survive directly from this source.
What are plants?
This is the process that takes places when liquid water changes to a vapor (gas).
What is evaporation?
When an effective insecticide is used on a population of insects, most of the insects are killed, but a few may survive due to genes that make them resistant to the insecticide. This is an example of:
What is natural selection?
Over the course of its lifetime, a male hippo may grow from 148 kg to 5910 kg. This process is responsible for the hippo's growth.
What is body cells dividing?
It is during this process that genetic material comes from two parents.
What is sexual reproduction?
Water moves directly from a lake to the air by the following process.
What is evaporation?
Planets in our solar system have different solar years. This explains the cause of an Earth solar year.
What is the Earth revolves around the sun.
This is number of times the United States has landed humans on the Moon during the Apollo Mission sequence.
What is 6?
This characteristic of a light wave increases as the light wave becomes brighter.
What is amplitude?
Noah has a small hand-held fan, that is powered by a single AAA battery. The fan is on an its blade is blowing air across his sweat drenched face. This explains how the form of energy changes in this fan as it running.
What is food and nesting areas?
This is the average internal Celsius temperature of the human body.
What is 37.0 oC?
This is most responsible for the uneven heating of the air in the atmosphere.
What is convection?
If three AA-batteries, each 1.5 volts, are connected in parallel (i.e. all positive terminals together and all negative terminals together), this is the total voltage for the three batteries connected this way.
What is 1.5 volts?
In some parts of TX, there is concern that too much water is being taken out of aquifers. This part of the water cycle is most responsible for resupplying water to the aquifers.
What is precipitation?
A 12-kg mass occupies 30 cm3 and has this density.
What is 400 g/cm3?
The ideal mechanical advantage of a ramp that is 24 menters long and 4 meters higher at one end versus the other.
What is 6?
This process allows green plants to control the amount of water stored in their leaves.
What is transpiration?
These are what the substances formed from a chemical reaction are generally called.
What is products?