2.2 Flashcards
What is the main organ for gaseous exchange in plants?
Leaves
True or False: Stomata are primarily responsible for gas exchange in plants.
True
Fill in the blank: The process of gas exchange in plants occurs mainly through ______.
Stomata
What gas do plants take in during photosynthesis?
Carbon dioxide
What gas do plants release as a byproduct of photosynthesis?
Oxygen
Multiple Choice: Which part of the leaf is responsible for the majority of gas exchange? A) Epidermis B) Mesophyll C) Stomata
C) Stomata
What is the role of guard cells in plants?
To regulate the opening and closing of stomata
True or False: Gaseous exchange in plants can occur through the roots.
False
Fill in the blank: During the day, stomata generally ______ to allow gas exchange.
Open
What environmental factor can cause stomata to close?
Drought or high temperatures
Multiple Choice: Which gas is NOT involved in plant respiration? A) Oxygen B) Carbon dioxide C) Nitrogen
C) Nitrogen
What is the main purpose of photosynthesis in plants?
To convert light energy into chemical energy
True or False: Transpiration is a process that aids in gas exchange.
True
What is the primary function of mesophyll cells in leaves?
To facilitate photosynthesis
Fill in the blank: The exchange of gases in plants is essential for ______ and ______.
Photosynthesis and respiration
Multiple Choice: Which type of mesophyll is primarily involved in gas exchange? A) Palisade B) Spongy C) Epidermal
B) Spongy
What happens to stomata at night?
They generally close to conserve water.
True or False: The number of stomata can vary between different plant species.
True
What is the role of the waxy cuticle on leaves?
To reduce water loss
Fill in the blank: The process by which water vapor exits the leaf is called ______.
Transpiration
Multiple Choice: Which environmental condition typically increases the rate of transpiration? A) High humidity B) High temperature C) Low light
B) High temperature
What structure in the leaf helps to prevent excessive water loss?
Cuticle
True or False: Gas exchange in plants is an active process requiring energy.
False
What is the significance of gas exchange for plants?
It allows for photosynthesis and respiration, essential for growth and energy.
Fill in the blank: The movement of gases in and out of the leaf occurs by ______.
Diffusion
What is the primary function of stomata in plants?
The primary function of stomata is to regulate gas exchange, allowing carbon dioxide to enter and oxygen to exit during photosynthesis.
True or False: Stomatal opening is primarily controlled by the turgor pressure of guard cells.
True
Fill in the blank: Stomatal opening is triggered by the influx of _______ into guard cells.
potassium ions
Which environmental factor can cause stomata to close?
Drought or high temperatures can cause stomata to close to prevent water loss.
What is the primary effect of water deficiency on stomatal opening in plants?
Water deficiency primarily causes stomata to close to reduce water loss.
True or False: Stomatal closing during water deficiency helps to conserve water in plants.
True
Fill in the blank: When plants experience water deficiency, the guard cells become ______, leading to stomatal closure.
flaccid
Which of the following factors is NOT directly affected by water deficiency in relation to stomatal function? A) Guard cell turgor B) Photosynthesis C) Soil pH
C) Soil pH
How does prolonged water deficiency impact a plant’s ability to photosynthesize?
Prolonged water deficiency reduces stomatal opening, limiting CO2 intake and thus decreasing photosynthesis.
