Ques:[What is the major thing that biological membranes consist of?
Options:
- (A) chemicals
- (B) glucose
- (C) lipids
- (D) Energy
- (E) complex
- (F) oxygen
- (G) matter
- (H) an ion]
Ans:[Lipids may consist of fatty acids alone, or they may contain other molecules as well. All biological membranes contain lipids as the major constituent. All biological membranes have lipids as the main consituent which consist of fatty acids.
(C)]

Ques:[What passes energy up the food chain to adult vegans?
Options:
- (A) cows
- (B) animals
- (C) Batteries.
- (D) chickens
- (E) Power companies.
- (F) glucose
- (G) Humans.
- (H) Plants.]
Ans:[Energy is passed up a food chain or web from lower to higher trophic levels. Plants represent the first trophic level. Energy is passed up a food chain from plants.
(H)]

Ques:[What has a circulatory system with a two-chambered heart?
Options:
- (A) sharks
- (B) insects
- (C) salmon
- (D) animals
- (E) barnacles
- (F) mammals
- (G) tortoises
- (H) alpacas]
Ans:[Fish have a circulatory system with a two-chambered heart. Fish include bass and salmon. Salmon have a circulatory system with a two-chambered heart.
(C)]

Ques:[Where are roundworms useful in an ecosystem?
Options:
- (A) killing animals
- (B) soils
- (C) fields
- (D) bacteria
- (E) eating plants
- (F) wetland
- (G) food
- (H) alveoli]
Ans:
[Roundworms make up the phylum Nematoda. Also, nematoda and rotifera are important groups contributing to soils. Roundworms make important contributions to soils.
(B)]