1. Complete the following statement: The response of plant roots to grow in the direction of a water source is known as – a. phototropism c. gravitropism b. hydrotropism d. thigmotropism 2. Complete the following statement: The response of a plant to grow toward a light source is known as – a. gravitropism c. phototropism b. hydrotropism d. thigmotropism 3. Complete the following statement: The response of a plant to grow in the direction of gravity is known as – a. phototropism c. thigmotropism b. hydrotropism d. gravitropism
1. Complete the following statement: The response of plant roots to grow in the direction of a water source is known as –
a. phototropism
c. gravitropism
b. hydrotropism
d. thigmotropism
2. Complete the following statement: The response of a plant to grow toward a light source is known as –
a. gravitropism
c. phototropism
b. hydrotropism
d. thigmotropism
3. Complete the following statement: The response of a plant to grow in the direction of gravity is known as –
a. phototropism
c. thigmotropism
b. hydrotropism
d. gravitropism
4. Plant roots are positively gravitropic; what does this mean?
a. They are positively attracted to soil.
b. They grow toward the direction of gravity.
c. They grow away from other plant roots.
d. They grow in the opposite direction to sunlight.
5. Plant shoots are positively phototropic; what does this mean?
a. They grow toward a light stimulus.
b. They grow toward other brightly colored plants.
c. They grow away from bright sunlight.
d. They reflect the majority of the wavelengths of light.
6. Which of the following is correct about plant roots?
a. Plant roots are positively phototropic and negatively gravitropic.
b. Plant roots are negatively phototropic and positively gravitropic.
c. Plant roots are positively hydrotropic and negatively gravitropic.
d. Plant roots do not display any major tropisms.
7. Which of the following is correct about plant shoots?
a. Plant shoots are negatively phototropic and positively gravitropic.
b. Plant shoots are negatively hydrotropic and positively gravitropic.
c. Plant shoots are positively phototropic and negatively gravitropic.
d. Plant shoots do not display any major tropisms.
8. In an unevenly irrigated soil, how would auxins affect the growth of the root and the stem of a plant?
a. The root would grow in the direction where water is abundant and so would the stem.
b. The root would grow in the direction where water is abundant while the stem would grow upwards.
c. The root would grow in the direction where water is abundant while the stem would grow in the opposite direction.
d. Both would grow without changing direction regardless of the abundance of water.
9. Which of the following best describes tropism?
a. Tropism is the response of a plant to grow toward or away from a stimulus.
b. Tropism is the mechanism by which a plant increases its cell division and growth.
c. Tropism is the response of a plant to external stimuli via its nervous system.
d. Tropism is the movement of a plant toward a more hospitable environment.
10. What happens when a stem is positively tropic to a certain stimulus?
a. Auxins will respond by increasing the growth rate of the side facing that stimulus.
b. The stem will respond by growing towards that stimulus.
c. The stem will grow and bend away from that stimulus.
d. The stem will respond by accumulating auxins in the side facing
that stimulus.
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