What attracts bees to the flower?
Options:
- (A) seeds
- (B) orchids
- (C) other bees
- (D) butterflies
- (E) thorns
- (F) heat
- (G) petals
- (H) pollen
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Let's think first: Petals attract pollinators to the flower. Bees are effective pollinators. Petals attract bees to the flower.... So the answer is [(G)]

Which type of system do most animals without backbones have?
Options:
- (A) sensory neurons
- (B) Veins and arteries.
- (C) Nervous system
- (D) Stereo system
- (E) Root system
- (F) to move people
- (G) Skeletal system
- (H) insects
--
Let's think first: Most invertebrates have a nervous system. Invertebrates are animals without a backbone. Most animals without backbones have a nervous system.... So the answer is [(C)]

Active immunity is when an immune response occurs after a germ produces what?
Options:
- (A) harmful substances
- (B) bioaerosols
- (C) rapid expansion
- (D) Allergies
- (E) anemia
- (F) it needs them
- (G) Chemical energy
- (H) memory cells
--
Let's think first: Active immunity results when an immune response to a pathogen produces memory cells. Pathogens are germs that cause disease. Active immunity results when an immune response to a germ produces memory cells.... So the answer is [(H)]

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
--
Let's think first: 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.... So the answer is [(C)]

Electromagnetic energy enters the body through what part of the eye?
Options:
- (A) energy transport
- (B) pupil
- (C) iris
- (D) skin
- (E) eyehole
- (F) lenses
- (G) organ
- (H) nerves
--
Let's think first: Light enters the eye through an opening called the pupil. Light is the visible form of electromagnetic energy. Electromagnetic energy enters the eye through an opening called the pupil.... So the answer is [(B)]

What is the name of the light cycle that plants detect?
Options:
- (A) photons
- (B) three
- (C) Summer
- (D) diurnal
- (E) autumn
- (F) Energy.
- (G) Energy
- (H) sunlight
--
Let's think first: Plants detect and respond to the daily cycle of light and darkness. Diurnal cycles Diurnal cycles are the daily cycles of light and darkness. Plants detect and respond to diurnal cycles.... So the answer is [(D)]