BIO 131 Lecture Exam Quizzes Latest 2026 With
Answers
Hormone 5-Ethylene
- gaseous hormone
- in high concentrations during aging, leaf dropping and ripening
- Stress and injury can cause the plant to release this hormone which then:
1. Promotes ripening
2. Promotes leaf shedding
3. Promotes triple response of seedlings
4. Causes plant to age faster
5. Promotes root and hair formation
6. Promotes flowering in multiple groups
What hormone gets released as a response to stress in a plant and promotes triple response
of seedlings?
Hormone 5-ethylene
What does the ethylene triple response of a seedling do?
- slows/ inhibits elongation
- causes stem to thicken
- Causes stem to grow sideways
What is gametophyte reduction
, - Male gametophyte --> pollen grain
- Female develops inside ovule
What do seeds do in gymnosperms?
Disperse offspring
What do gymnosperms use pollen for?
eliminating the need for water for fertilization
What are the parts of an ovule in an angiosperm?
Sporangium, megasporocyte, integuments
What are the parts of an ovule and what are their ploidy levels
- Integument (outside layer that protects megasporangium): 2n
- Megaspore (egg (n))
- Megasporangium (2n)
What does the integument of an ovule become after fertilization?
seed coat
How many integuments do gymnosperms have and what is the ploidy level?
one (2n)
How many integuments do angiosperms have and what is the ploidy level?
Answers
Hormone 5-Ethylene
- gaseous hormone
- in high concentrations during aging, leaf dropping and ripening
- Stress and injury can cause the plant to release this hormone which then:
1. Promotes ripening
2. Promotes leaf shedding
3. Promotes triple response of seedlings
4. Causes plant to age faster
5. Promotes root and hair formation
6. Promotes flowering in multiple groups
What hormone gets released as a response to stress in a plant and promotes triple response
of seedlings?
Hormone 5-ethylene
What does the ethylene triple response of a seedling do?
- slows/ inhibits elongation
- causes stem to thicken
- Causes stem to grow sideways
What is gametophyte reduction
, - Male gametophyte --> pollen grain
- Female develops inside ovule
What do seeds do in gymnosperms?
Disperse offspring
What do gymnosperms use pollen for?
eliminating the need for water for fertilization
What are the parts of an ovule in an angiosperm?
Sporangium, megasporocyte, integuments
What are the parts of an ovule and what are their ploidy levels
- Integument (outside layer that protects megasporangium): 2n
- Megaspore (egg (n))
- Megasporangium (2n)
What does the integument of an ovule become after fertilization?
seed coat
How many integuments do gymnosperms have and what is the ploidy level?
one (2n)
How many integuments do angiosperms have and what is the ploidy level?
