Science Review

What is the purpose of hollow bones in birds?

• Do they provide insulation in cold weather?

• Do they store excess water for long flights?

• Do they aid in the digestion of food?

• Do they provide a lightweight structure for flight and aid in breathing?

How do hollow bones in birds aid their flight?

• Hollow bones are filled with air, which makes it difficult for birds to fly

• Hollow bones make birds lighter, allowing for easier flight.

• Hollow bones provide extra weight, which facilitates bird flight

• Hollow bones are more prone to breaking, which makes flight difficult

What are the main functions of xylem in plants?

• Production of flowers and fruits

• Transport of water and nutrients, provide structural support and nutrient storage

• Conversion of sunlight into energy

• Regulation of temperature and humidity

How do gills in fish facilitate the exchange of oxygen in water?

• The gills have a large surface area with thin walls to facilitate the diffusion of oxygen from the water to the fish's bloodstream.

• The gills act as a filter to remove impurities from the water

• The gills produce oxygen for the fish to breathe

• The gills help fish see better in the water

How do plants respond to external stimuli such as sunlight?

• They move towards sunlight for photosynthesis

• They move away from sunlight to avoid drying out

• They do not respond to sunlight

• They produce more flowers when exposed to sunlight

How do plants respond to the external stimulus of touch?

• Plants do not respond to the stimulus of touch

• Plants move away from the source of touch

• Plants can show growth movements in response to touch, known as thigmotropism

• Plants produce more flowers when touched

How do plants respond to external stimuli such as phototropism?

• They do not respond to light

• They grow towards the light source

• They grow away from the light source

• They change their color to match the light source

What is the process by which plants respond to external stimuli called?

• Photosynthesis

• Respiration

• Tropism

• Transpiration

How do plants respond to the external stimulus of gravitropism?

• They grow towards the source of gravity

• They grow away from the source of gravity

• They do not respond to gravity

• They change their color to match the source of gravity

What is the main cause of wilting in plants?

• Lack of sunlight

• Excessive heat

• Lack of water

• Too much fertilizer