protected cultivation

Greenhouses which do not require mechanical energy for moving fluids for their operation is ………………. Greenhouse

• Passive
• Active
• Solarium
• none of these

The light intensity is measured by the international unit known as ………….

• Newton
• Lux
• Joule
• none of these

A well maintained greenhouse with glass and acrylic sheet can last for……………

• Below 5 years
• Below 10 years
• 20 years or more
• none of these

The ability of air to remove solar heat from the greenhouse depends upon its ……………

• Volume
• Area
• Weight
• none of these

The materials used for the construction of low cost polyhouses are ………….

• Glass and plastic films
• Wood and bamboo
• GI and aluminum sheets
• none of these

…………… can function either as open or a closed system and is used often for the production of seedlings grown in plug trays

• Boom watering
• Hand watering
• Drop watering
• none of these

A …………….is used to measure direct solar radiation from the sun and its marginal periphery

• Pyranometer
• Pyrheliometer
• Hydrometer
• none of these

The heat content per unit mass is called ………….

• Specific volume
• Specific capacity
• Specific enthalpy
• none of these

…………….. is used to measure Relative Humidity

• Sling Psychrometer
• Sunshine recorder
• Thermostat
• none of these

The ……………..can lower the temperature of incoming air by about 80% of the difference between the dry and wet bulb temperatures

• Fog cooling system
• Fan and pad cooling system
• Convection cooling system
• none of these