Chapter 24:
Chemical Control
Practice Test
1.
What factor controls a plant's response to gravity?
a.
amount of water
b.
amount of light
c.
gibberellins
d.
auxins
Hint
2.
What is the release of an egg into an oviduct?
a.
menstruation
b.
the follicle stage
c.
ovulation
d.
the corpus luteum stage
Hint
3.
Which of the following is an example of the negative feedback system that keeps the amount of the hormone thyroxine at the correct level in the body?
a.
level of thyroxine falls - hypothalamus secretes hormone - pituitary secretes TSH - TSH stimulates thyroid to produce thyroxine - hypothalamus stops secreting hormone
b.
level of thyroxine increases - stimulates pituitary to produce TSH - TSH stimulates hypothalamus to secrete hormone - hormone stops thyroid from producing thyroxine
c.
level of thyroxine falls - pituitary secretes TSH - TSH stimulates hypothalamus to secrete hormone - hormone stimiulates thyroid to produce thyroxine - pituitary stops producing TSH
d.
level of thyroxine falls - thyroid produces thyroxine - thyroxine stimulates pituitary to produce TSH - TSH stimulates hypothalamus to secrete hormone - hormone stops production of thyroxine by thyroid
Hint
4.
One type of animal hormone is a protein-type hormone. Which of these is an example of a protein-type hormone?
a.
insulin
b.
testosterone
c.
estrogen
d.
progesterone
Hint
5.
What is the dropping of fruit or leaves from a plant?
a.
phototropism
b.
tropism
c.
abcission
d.
geotropism
Hint
6.
What are organs that are specialized for secreting substances needed by the organism?
a.
ducts
b.
glands
c.
tubules
d.
vessels
Hint
7.
What event marks the beginning of the follicle stage of the menstrual cycle?
a.
the hypothalamus causes the pituitary to decrease FSH production
b.
a follicle secretes the hormone estrogen
c.
the follicle bursts and releases an egg into the oviduct
d.
a new egg begins to mature within a follicle of the ovary
Hint
8.
What is a chemical that is produced in one tissue of an organism and transported to another tissue, where it causes a response?
a.
a hormone
b.
a gland
c.
ultraviolet light
d.
a messenger
Hint
9.
What is a plant's response to the force of gravity?
a.
photosynthesis
b.
geotropism
c.
thigmotropism
d.
phototropism
Hint
10.
What are organs that secrete substances that are carried by the bloodstream rather than in ducts?
a.
exocrine glands
b.
mammary glands
c.
digestive organs
d.
endocrine glands
Hint
