REVISION GREENHOUSE

What is a greenhouse?

• A structure made of concrete for recreational activities

• A type of outdoor playground for children

• A building used for storing gardening tools

• A structure covered with a transparent material for growing crops

What is the greenhouse effect?

• Rise in ocean levels due to reduced carbon dioxide

• Decrease in global warming due to ice caps melting

• Formation of a protective layer around the earth

• Increase in atmospheric temperature due to carbon dioxide blanket

What is an advantage of using greenhouses?

• Increased crop productivity

• Inefficient use of water and fertilizers

• Decreased quality of produce

• Lack of control over pests and diseases

What is a factor to consider when selecting a site for a greenhouse?

• Good solar radiation

• Proximity to noisy areas

• Lack of drainage system

• Absence of natural windbreak

What is a common material used for building frames in greenhouses?

• Steel

• Rubber

• Copper

• Plastic

What is the main disadvantage of plastic films as covering material for greenhouses?

• Difficult installation

• Low light intensity

• Short life span

• High cost

Which type of greenhouse covering material has a long life of up to 20 years?

• Shading nets

• Truss frames

• Rigid panels

• Plastic films

What is the main disadvantage of rigid panel greenhouses?

• High cost

• Fire hazard

• Low light intensity

• Dust collection and algae harboring

What is the purpose of shading nets in a greenhouse?

• Protection from UV radiation only

• Creating appropriate micro-climate conditions

• Protection from climate conditions only

• Enhancing light transmission

Which heating system for greenhouses involves burning gas within pipes suspended overhead?

• Central heating system

• Solar heating system

• Unit heater system

• Radiation heating system