What structure carries manufactured sugars from the leaves down to the roots?
A) xylem
B) phloem
C) nodes
D) buds
Question 2A plant's clock is located in the _____ of plant cells. The clock controls an enzyme that modifies a protein necessary for photosynthesis as the day starts and light energy is available.
A) veins
B) roots
C) nuclei
D) stomata
Question 3Highly refined oils applied to citrus crops exclude oxygen from insects, thus causing suffocation.
Indicate whether the statement is true or false.
Question 4What structure carries water and nutrients absorbed by the roots to the leaves?
A) xylem
B) phloem
C) flax
D) nodes
Question 5_____ are the joints at which buds, leaves, and branches grow out from the stem.
A) Tubins
B) Nodes
C) Intersections
D) Rootstocks
Question 6What are the buds that can grow into stems or side branches?
A) nodes
B) axillary
C) terminal
D) scars
Question 7What common crop (animal feed) contains a natural growth stimulant?
A) Alfalfa
B) Wheat
C) Marigolds
D) Cactus
Question 8Specific genes on the chromosomes of certain plant cells can make the plant resistant to a pest.
Indicate whether the statement is true or false.
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