1. What happens to a dry seed when it absorbs water?
A.
It swells
B.
It becomes smaller
C.
It loses its seed coat immediately
D.
It changes into a leaf
Correct Answer:
It swells
Explanation:
A dry seed absorbs water by imbibition, causing its tissues to expand and the seed to swell.
2. Which process mainly causes the swelling of a dry seed?
A.
Imbibition
B.
Transpiration
C.
Pollination
D.
Photosynthesis
Correct Answer:
Imbibition
Explanation:
Imbibition is the absorption of water by substances in the seed, leading to seed swelling.
3. Which part of a seed commonly absorbs water and swells during imbibition?
A.
Seed tissues
B.
Flower petals
C.
Leaf veins
D.
Root hairs of an adult plant
Correct Answer:
Seed tissues
Explanation:
Seed tissues such as the seed coat and stored food materials absorb water and expand during seed swelling.
4. Why does the seed coat often become softer after a dry seed absorbs water?
A.
Water enters the seed coat by imbibition
B.
The seed coat produces chlorophyll
C.
The seed coat loses all its cells
D.
The seed coat changes into a root
Correct Answer:
Water enters the seed coat by imbibition
Explanation:
The seed coat absorbs water during imbibition, making it softer and contributing to the swelling of the seed.
5. Which observation is a simple example of seed swelling?
A.
A soaked bean becomes larger
B.
A dry bean becomes lighter without water
C.
A leaf turns green in sunlight
D.
A flower produces pollen
Correct Answer:
A soaked bean becomes larger
Explanation:
A bean seed absorbs water during soaking, and the absorbed water causes it to increase in size.
6. What is the main source of the increase in size of a soaked seed?
A.
Absorbed water
B.
Absorbed sunlight
C.
New leaves
D.
Pollen grains
Correct Answer:
Absorbed water
Explanation:
Water taken up by the seed during imbibition causes its dry tissues to expand, producing seed swelling.
7. Seed swelling during imbibition is most easily noticed when a dry seed is placed in what?
A.
Water
B.
Dry sand
C.
Bright light only
D.
Air without moisture
Correct Answer:
Water
Explanation:
Placing a dry seed in water allows it to absorb water by imbibition, making the swelling visible.
8. What change generally occurs in the volume of a seed after it absorbs water?
A.
Its volume increases
B.
Its volume becomes zero
C.
Its volume always decreases
D.
Its volume remains exactly unchanged
Correct Answer:
Its volume increases
Explanation:
Water absorption causes the seed materials to expand, so the volume of the seed increases.
9. Which type of seed material helps in swelling by absorbing water?
A.
Stored food material
B.
Flower nectar
C.
Pollen tube
D.
Leaf wax
Correct Answer:
Stored food material
Explanation:
Stored food materials in seeds can absorb water and expand, contributing to the swelling of the seed.
10. What may happen to a seed coat as the seed swells after absorbing water?
A.
It may split or become loose
B.
It turns into a flower
C.
It disappears without absorbing water
D.
It produces fruits immediately
Correct Answer:
It may split or become loose
Explanation:
As the inner seed tissues expand after water absorption, pressure can make the seed coat loosen or split.
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