Summer Practice

By Jayland Redd

Practice of the summer

The jackrabbit is a desert mammal that has a circulatory system adapted to its environment. During hot days, blood flow to its ears increases, helping to dissipate heat and regulate body temperature.
The process by which an organism maintains stable internal conditions despite external changes is known as homeostasis

Body

Stability

Multiple Choice

The jackrabbit is a desert mammal. The jackrabbit’s

circulatory system increases blood flow to the ears

during hot days. The blood flow to the ears

decreases during cool or cold nights. This circulation

pattern is most directly related to —

• detoxification

• homeostasis

• osmosis

​Reproductive Cell Division

Reproductive cells include sperm cells in males and egg cells in females. During meiosis, the parent cell divides from one cell into four cells and passes only half of its genetic material to the new cells. This helps make sure that when a sperm and egg come together, the resulting baby has the right amount of genetic information.

Multiple Choice

According to this diagram, the result of spermatogenesis is four sperm cells, each with —

• Half the number of chromosomes

• Quadruple the amount of chromosomes

• The exact same number of chromosomes

​Bacteria and Ecosystems

​Bacteria are decomposers. Their job is the break down the dead materials found in nature. When bacteria break down dead materials, they release nutrients such as nitrogen. It is good for bacteria to release nitrogen back into the soil, because plants need it to grow, and if plants are growing, then animals can eat them!

Multiple Choice

In an ecosystem, a sudden decrease in the number of bacteria in the soil would most likely result in —

• increased water pollution in the soil

• a reduction in the amount of nitrogen available to the ecosystem

• increased precipitation and flooding of the soil

Multiple Choice

In a population of 120 oak trees, 25% of the population has oak wilt disease. What is the number

of trees in this population that have oak wilt?

• 5

• 20

• 30

​Scientists use dichotomous keys in order to determine the name of an organism.

To the left, you see an insect with rounded tips, wings with strips, lacking hairs, but has tail like extensions longer than its antennae.

What would be the name of the organism?

Multiple Choice

​Scientists use dichotomous keys in order to determine the name of an organism.

To the left, you see an insect with rounded tips, wings with strips, lacking hairs, but has tail like extensions longer than its antennae.

What would be the name of the organism?

• Papilio palamedes

• Eurytides marcellus