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Which picture is showing net venation, and which is showing parallel venation?
B. ____PARALLEL________
What is the major difference between a single leaf and a compound leaf? Draw and label this difference.
Single leaf- have a single, undivided leaf blade
Compound leaf - have a blade divided into two or more leaflets
3. Explain why most plants have stomata mainly on the lower surface of their leaves.
Stomata are openings in the leaf that allow oxygen to leave the
plant and carbon dioxide to go into the plant. They also allow
water vapour to escape from the plant when they are open. When
the sun is shining, plants want to keep as much water as possible.
If stomata are on the underside of the leaf, less water vapour will
escape from the plant. These stomata are out of direct sunlight.
4. Why are guard cells important to stomata?
They regulate the opening and closing of the stomata. Without them,
stomata would always be open and carbon dioxide would
continuously come in and water vapour would continuously leave the
plant – photosynthesis would not occur regularly due to too
much/too little of needed reactants.
5. Predict the environment in which you would expect to find plants with several layers of palisade mesophyll cells densely packed with
chloroplasts. Explain why.
Lots of chloroplasts – must be a lot of sunlight because chloroplasts
are the site of photosynthesis. Perhaps an open field, an
environment in the tropics.
What is the difference between a taproot and a fibrous root?
Taproot – root systems where the primary root remains predominant,
though very small secondary roots are present
fibrous root= root systems whose primary roots have disintegrated and
were replaced by other smaller roots.
Why are pneumatophores so important to certain plants?
Pneumatophores are roots that evolved to let plants survive in
waterlogged, oxygen-poor soils (swamp) environments. These are
special extensions which grow up and out of the water and function to
supply oxygen to the root tissues below. Oxygen then diffuses into the
plant parts that need it.
How does root pressure form within the root?
Root pressure is the culmination of water and minerals, together
called xylem sap, in the root. Minerals get into the root by a process
called active transport, water follows by a process called osmosis.
This pressure pushed xylem sap up the xylem tubes. However, this
pressure can only push the sap up the plant so far.
What does water transport in the xylem depend on within the plant? Briefly describe each of these factors. Does water transport within
the plant require energy of any kind?
-root pressure pushed water (xylem sap – mix of water and minerals)
into xylem
-water adheres to inner walls of xylem, creating a pulling force on the
column of water molecules
-water is cohesive and sticks together continously from ground to top
of the highest leaves
-tranpiration pull pulls water up the stem to the leaves
Speculate why sugar maple trees demonstrate the importance of plants to the growth of Canadian society. Why is this xylem sap, better
known as maple syrup, so important to our society?
-economically: brings money into our society, means of money for
maple syrup producers, shop owners; Canadian maple syrup
renowned throughout the world
-socially: pancake dinners, shrove Tuesday, brunches, used to
have ‘syrup’ parties