GED Section 3 Science

GED Section 3 Science practice questions, page 3 of 3, with answer review and explanations.

Question 11

In order to protect themselves from being eaten, animals resort to camouflage and chemical defense. Animals camouflage by mimicking the appearance of their environment. Animals that have chemical defenses contain chemicals noxious to predators. Which of these is NOT an example of camouflage or chemical defense?

  1. A walking stick insect looks just like a twig.
  2. A skunk has an awful smell.
  3. Feathers of the pitohui bird in New Guinea contain a deadly toxin.
  4. Roses have thorns.
  5. A harlequin crab looks just like the sea cucumber it lives on.

Question 12

Osmosis is the movement of water across a selectively permeable membrane in order to equalize the concentration (the amount of protein per milliliter of water) on two sides of the membrane. Consider the diagram below. The container is divided into two compartments, A and B, by a selectively permeable membrane. Each circle represents 100 protein molecules that cant pass through the membrane. The amount of water on two sides of the membrane is initially equal. What will happen as a result of osmosis?

  1. Protein will flow from compartment B to compartment A.
  2. Protein will flow from compartment A to compartment B.
  3. Water will flow from compartment B to compartment A.
  4. Water will flow from compartment A to compartment B.
  5. Both water and protein will flow from compartment B to compartment A.

Question 13

Which of the following statements about human genetics is true?

  1. Half the chromosomes in a human are inherited from the mother, and half from the father.
  2. A human looks 50% like the father, and 50% like the mother.
  3. Fraternal twins are genetically more similar than siblings who are not twins.
  4. Exposure to X-rays can have no effect on a human’s chromosomes.
  5. Genes are particles found in the nucleus of DNA atom.

Question 14

Identical twins have exactly the same genes. Identical twins result when

  1. an egg fertilized by one sperm divides in two.
  2. two eggs are fertilized with two sperm cells.
  3. one egg divides in two and is fertilized by two sperm cells.
  4. the same sperm cell fertilizes two eggs.
  5. the same egg is fertilized by two sperm cells.