ENDOCRINE ORGANS AND RESPIRATORY SYSTEM
RESPIRATORY SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
broad and flat to provide a large surface area
|
|
|
moist surface of the mesophyll cells to allow gases to dissolve in the moisture
|
|
|
epidermis not covered by cuticle to allow gases to diffuse freely
|
|
|
many stomata to allow gases to pass into and out of the leaves freely
|
Detailed explanation-1: -Leaves are adapted for photosynthesis and gaseous exchange. They are adapted for photosynthesis by having a large surface area, and contain openings, called stomata to allow carbon dioxide into the leaf and oxygen out.
Detailed explanation-2: -Stomata, as mentioned above, are the structures through which gas exchange occurs in leaves. Each stoma is surrounded by two guard cells, which can open and close depending on environmental conditions.
Detailed explanation-3: -Adaptations of leaves to maximise gas exchange: They are thin which gives a short diffusion distance. They are flat which provides a large surface area to volume ratio. They have many stomata which allow movement of gases in and out of the air spaces inside the leaf to maintain a steep concentration gradient.
Detailed explanation-4: -The main functions of leaves are photosynthesis, exchange of gasses and transpiration.