MAP Science 3 — Questions and Answers
Question 1: In a Missouri forest food web, oak trees produce acorns eaten by squirrels, which are eaten by red-tailed hawks. What role do the oak trees play?
- Producers (Correct answer)
- Primary consumers
- Secondary consumers
- Decomposers
Correct answer: Producers
Oak trees make their own food through photosynthesis, so they are producers.
Question 2: Which organelle is the site of cellular respiration in plant and animal cells?
- Chloroplast
- Mitochondrion (Correct answer)
- Ribosome
- Golgi apparatus
Correct answer: Mitochondrion
Mitochondria break down glucose to release usable energy (ATP).
Question 3: A pea plant heterozygous for tall stems (Tt) is crossed with a short plant (tt). What percentage of offspring are expected to be short?
- 0%
- 25%
- 75%
- 50% (Correct answer)
Correct answer: 50%
A Tt × tt Punnett square gives 2 Tt and 2 tt, so 50% are short.
Question 4: Which process allows a population of bacteria to become resistant to an antibiotic over time?
- Bacteria choose to change their DNA
- Natural selection of bacteria with resistant traits (Correct answer)
- Antibiotics teach bacteria to survive
- Bacteria grow larger to block the medicine
Correct answer: Natural selection of bacteria with resistant traits
Bacteria that already carry resistant variations survive and reproduce, increasing resistance in the population.
Question 5: Zebra mussels, an invasive species, have spread in Missouri waterways. What is the most likely effect on native mussels?
- Increased food supply for native mussels
- No effect because they eat different foods
- Increased competition for food and space (Correct answer)
- Native mussels will evolve quickly to eat zebra mussels
Correct answer: Increased competition for food and space
Invasive zebra mussels outcompete natives for plankton and attach to them, reducing native populations.
Question 6: During photosynthesis, which substances are the main reactants?
- Glucose and oxygen
- Carbon dioxide and water (Correct answer)
- Oxygen and water
- Glucose and carbon dioxide
Correct answer: Carbon dioxide and water
Plants use carbon dioxide and water, with light energy, to produce glucose and oxygen.
Question 7: Which type of cell division produces gametes with half the number of chromosomes of the parent cell?
- Meiosis (Correct answer)
- Mitosis
- Binary fission
- Budding
Correct answer: Meiosis
Meiosis produces haploid gametes (sperm and egg) for sexual reproduction.
MAP Science 3
In a Missouri forest food web, oak trees produce acorns eaten by squirrels, which are eaten by red-tailed hawks.
What role do the oak trees play?