Review: Living Things and Environment

Crabs, Dragonflies, and Mosquitoes have a circulatory system composed of a heart, and blood that only circulates inside the blood vessels.

• True

• False

Answer explanation

Crabs, Dragonflies, and Mosquitoes are invertebrates, which means they have an Open Circulatory System composed of a heart and blood  that freely drains to the body cavity.

The blood in organisms with a closed circulatory system is called hemolymph.

• True

• False

Answer explanation

The blood in organisms with an “OPEN” circulatory system is called hemolymph.

In humans, the chromosomes containing the genetic material can be found in the cytoplasm of the cell.

• True

• False

Answer explanation

The chromosomes are located inside the nucleus.

According to Gregor Mendel’s experiment, traits of an organism could be categorized into two - expressed and hidden.

• True

• False

According to the Law of Segregation, two versions (alleles) of one trait segregate from each other during meiosis. 

• True

• False

The walls of the arteries are thicker compared to the walls of the veins.

• True

• False

The tonsils are the special structures in the pharynx that allows for the closing of trachea during swallowing to avoid food going to the windpipe.

• True

• False

Answer explanation

The Epiglottis is the special structure that closes the trachea during swallowing.

The systemic circuit is responsible for sending oxygen to the cells of the stomach.

• True

• False

In incomplete dominance, the appearance of a hybrid or heterozygous offspring follows the appearance of the recessive trait.

• True

• False

Answer explanation

In incomplete dominance, appearance of a hybrid or heterozygous falls between the phenotypes of the two parents. No dominant or recessive traits.

Sex-limited traits are inherited by an individual from the X or Y chromosomes of the parents. 

• True

• False

Answer explanation

Sex-limited traits are generally autosomal, which means that they are not found on the X or Y chromosomes. Example- lactation is only expressed in females.