biology ch9

Spongy cells are loosely packed. What is the adaptation?

• Shortens diffusion distance of gases between plant body and atmosphere

• Provides a large surface area for gas exchange

• Regulates rate of gas exchange by controlling the opening and closing of stomata

• Allows gases to diffuse freely

There are numerous air spaces among the spongy mesophyll cells. What is the adaptation?

• allows gases to dissolve and then diffuse into or out of the cell

• Supports the leaf

• Provides a large surface area for gas exchange

• Allow gases to diffuse freely

There are stomata in the epidermis. What is the adaptation?

• Allows gas exchange to be regulated by controlling the opening and closing of stomata

• allows gases to diffuse freely

• allows gases to move into and out of the leaves freely

• provide a large surface area for gas exchange

Guard cells surrounding the stomata

• Allows rate of gas exchange to be regulated by controlling the opening and closing of stomata

• Allows gases to diffuse freely

• Provides a large surface area for gas exchange

• Shortens the diffusion distance of gases between the plant body and the atmosphere

Low light intensity

• Only respiration takes place

• Rate of photosynthesis is lower than rate of respiration

• Rate of photosynthesis is higher than rate of respiration

deficiency of phosphorus

• Leaves turn purple

• Blackened leaf edges

• Roots poorly developed

• Poor growth

deficiency of nitrogen

• Poor growth

• Yellow leaves

• Purple leaves

• Blackened leaf edges

palisade mesophyll cells are

• closely packed and cylindrical

• loosely packed and irregular shaped

• Contain fewer chloroplasts

• Contain many chloroplasts

• Air spaces among cells are narrow

leaf is broad and flat

• allows gases to diffuse freely

• shortens the diffusion distance

• provides a large surface area for gas exchange

• regulates rate of gas exchange