Biology STAAR Review #3

Front

What are root hairs and why are they important for plants?

Back

Root hairs are extensions of plant roots that increase the surface area for nutrient and water absorption, playing a crucial role in the plant's homeostasis.

Front

What is mutation in the context of genetics?

Back

Mutation is a change in the DNA sequence that can lead to new traits in organisms, such as the blue dots in ladybug offspring due to a chemical spill.

Front

What is the function of xylem in plants?

Back

Xylem is the tissue in plants responsible for transporting water and dissolved minerals from the roots to the rest of the plant.

Front

What processes are involved in homeostasis in living organisms?

Back

Homeostasis involves processes that maintain stable internal conditions, including the transport of molecules and energy conversions.

Front

How can genetic mutations affect a population of insects exposed to pesticides?

Back

Genetic mutations can lead to resistance against pesticides, allowing resistant individuals to survive, reproduce, and pass on their traits to future generations.

Front

What is the role of phloem in plants?

Back

Phloem is the tissue responsible for transporting sugars and nutrients produced by photosynthesis from the leaves to other parts of the plant.

Front

Define natural selection.

Back

Natural selection is the process where organisms better adapted to their environment tend to survive and produce more offspring.

Front

What is genetic drift?

Back

Genetic drift is a mechanism of evolution that refers to random changes in the frequency of alleles in a population, often having a more significant effect in small populations.

Front

Explain the concept of gene flow.

Back

Gene flow is the transfer of genetic material between populations, which can increase genetic diversity and affect evolutionary processes.

Front

What is transpiration in plants?

Back

Transpiration is the process by which water vapor is released from plant leaves into the atmosphere, helping to regulate temperature and nutrient transport.