Question

1. Ash from a volcanic eruption decreases the amount of available solar energy for a region. How will a decrease in available sunlight most likely affect ecosystems of this region?
1Points
A
Decomposer populations will increase, causing a decrease in consumer populations.

B
Decomposer populations will increase, causing an increase in consumer populations.

C
Producer populations will decrease, causing a decrease in consumer populations.

D
Producer populations will decrease, causing an increase in consumer populations.

2. A male pistol shrimp with protective eye tissue pockets mates with a female shrimp without protective eye tissue pockets. All of the offspring have eye tissue pockets. What is the most reasonable conclusion that can be made about the eye tissue pocket trait in pistol shrimp?

1Points
A
It is a recessive, autosomal trait.

B
It is a dominant, autosomal trait.

C
It is a trait that results from multiple alleles.

D
It is a trait that results from incomplete dominance.

3. A farmer observed that an increase in the nitrogen content of the soil in a field was followed by an increase in producer productivity. What does this observation most likely indicate about the relationship between nitrogen and the producers in the field?

1Points
A
Nitrogen was a biotic factor.

B
Nitrogen was a limiting factor.

C
Nitrogen became a surplus resource.

D
Nitrogen became a selection pressure.

Answer 1

Answer:

C

Explanation:

Volcanic eruption spews volcanic ash into the atmosphere that lingers and blocks out sunlight for months. This causes photoautotrophs to decrease in population numbers due to the inability to photosynthesize.  This will negatively affect the heterotrophs that depend on the autotrophs for energy.

Answer:

B

Explanation:

There are usually dominant and recessive alleles. The dominant alleles mask the expression of the recessive allele. Therefore, whenever an offspring has a dominant allele of a gene, it will be expressed whether in homozygous or heterozygous form.

Answer:

B

Explanation:

A limiting factor is an element whose abundance affects the growth and distribution of a population of a species in an environment. In this case, increasing the levels of Nitrogen in the environment increases the population size and vice versa.