1. Which plant hormone is commonly used to promote root formation in stem cuttings?
A.
Auxin
B.
Gibberellin
C.
Ethylene
D.
Abscisic acid
Correct Answer:
Auxin
Explanation:
Auxin promotes the formation of adventitious roots in stem cuttings, helping the cutting develop into a new plant.
2. What is the main purpose of applying auxin to the cut end of a stem cutting?
A.
To promote root development
B.
To prevent leaf formation
C.
To increase fruit ripening
D.
To stop water absorption
Correct Answer:
To promote root development
Explanation:
Auxin applied to the cut end stimulates the development of new roots from the stem cutting.
3. The roots that develop from a stem cutting after auxin treatment are usually called:
A.
Adventitious roots
B.
Primary roots
C.
Lateral roots
D.
Storage roots
Correct Answer:
Adventitious roots
Explanation:
Roots arising from unusual parts of a plant, such as the stem of a cutting, are called adventitious roots.
4. Which form of auxin is often used as a rooting hormone for cuttings?
A.
Indole-3-butyric acid
B.
Gibberellic acid
C.
Abscisic acid
D.
Ethylene gas
Correct Answer:
Indole-3-butyric acid
Explanation:
Indole-3-butyric acid, or IBA, is a synthetic auxin commonly used to encourage root formation in plant cuttings.
5. A stem cutting treated with a suitable rooting hormone is more likely to:
A.
Produce roots
B.
Lose all its cells
C.
Stop absorbing water permanently
D.
Produce seeds immediately
Correct Answer:
Produce roots
Explanation:
A suitable concentration of auxin increases the chance that a stem cutting will form new roots.
6. In plant propagation, auxin rooting powder is generally applied to the:
A.
Cut end of the stem
B.
Tip of a mature leaf
C.
Surface of a fruit
D.
Inside of a seed
Correct Answer:
Cut end of the stem
Explanation:
The cut end is the region from which new roots may form, so rooting powder is applied there.
7. Why are auxins useful in propagating plants from stem cuttings?
A.
They help the cuttings form roots
B.
They change stems into flowers
C.
They prevent all cell division
D.
They remove chlorophyll from leaves
Correct Answer:
They help the cuttings form roots
Explanation:
Auxins are useful because they stimulate root initiation in stem cuttings, allowing vegetative propagation.
8. Which type of cutting commonly benefits from treatment with a rooting hormone?
A.
Stem cutting
B.
Dry piece of bark
C.
Detached fruit
D.
Mature seed coat
Correct Answer:
Stem cutting
Explanation:
Rooting hormones are applied to stem cuttings to encourage the formation of adventitious roots.
9. What may happen if an appropriate auxin treatment is given to a stem cutting?
A.
Root initiation may occur faster
B.
The cutting becomes a seed
C.
All roots are immediately destroyed
D.
The stem loses its ability to grow
Correct Answer:
Root initiation may occur faster
Explanation:
Auxin can stimulate and speed up the initiation of roots in a suitable stem cutting.
10. The use of auxin to produce roots on stem cuttings is an example of:
A.
Vegetative propagation
B.
Pollination
C.
Seed dispersal
D.
Fruit formation
Correct Answer:
Vegetative propagation
Explanation:
Producing a new plant from a stem cutting is vegetative propagation, and auxin helps the cutting develop roots.
Short questions are currently unavailable for this page.