Plant Tropisms Reading ISA (B)
Direction: Read the text below. Use textual evidence to answer questions 1 – 5 on the loose-leaf below.
All organisms respond to stimuli. Auxins are a type of plant hormone that causes plant stems and leaves to grow towards a stimulus. A
plant response to an external stimulus is known as a tropism. A positive tropism occurs when the plant grows towards the stimulus. A negative
tropism occurs when the plant grows away from the stimulus.
Positive tropisms include phototropism, thigmotropism, hydrotropism and gravitropism. Phototropism is a plant response to light.
Thigmotropism is a plant response to touch. This is observed when a Venus flytrap closes its trap when an insect enters or when plants coils
around a pole. Hydrotropism is a plant response to water. Gravitropism is a plant response to gravity. This type of response will be positive or
negative depending on the part of the plant. The downward growth of roots is a positive tropism. A stem growing upwards away from gravity is
a negative tropism.
Questions:
1. Identify a plant’s response to external stimuli.
4. Identify the human system plant responses can compare to. Support
2. Identify a plant hormone involved in plant responses.
your answer.
3. Contrast positive and negative tropisms.
5. Identify four types of tropisms, the stimuli each responds to and whether they
are positive or negative responses.
Plant Tropisms Reading ISA (B)
Direction: Read the text below. Use textual evidence to answer questions 1 – 5 on the loose-leaf below.
All organisms respond to stimuli. Auxins are a type of plant hormone that causes plant stems and leaves to grow towards a stimulus. A
plant response to an external stimulus is known as a tropism. A positive tropism occurs when the plant grows towards the stimulus. A negative
tropism occurs when the plant grows away from the stimulus.
Positive tropisms include phototropism, thigmotropism, hydrotropism and gravitropism. Phototropism is a plant response to light.
Thigmotropism is a plant response to touch. This is observed when a Venus flytrap closes its trap when an insect enters or when plants coils
around a pole. Hydrotropism is a plant response to water. Gravitropism is a plant response to gravity. This type of response will be positive or
negative depending on the part of the plant. The downward growth of roots is a positive tropism. A stem growing upwards away from gravity is
a negative tropism.
Questions:
1. Identify a plant’s response to external stimuli.
4. Identify the human system plant responses can compare to. Support
2. Identify a plant hormone involved in plant responses.
your answer.
3. Contrast positive and negative tropisms.
5. Identify four types of tropisms, the stimuli each responds to and whether they
are positive or negative responses.
Plant Tropisms Reading ISA (B)
Direction: Read the text below. Use textual evidence to answer questions 1 – 5 on the loose-leaf below.
All organisms respond to stimuli. Auxins are a type of plant hormone that causes plant stems and leaves to grow towards a stimulus. A
plant response to an external stimulus is known as a tropism. A positive tropism occurs when the plant grows towards the stimulus. A negative
tropism occurs when the plant grows away from the stimulus.
Positive tropisms include phototropism, thigmotropism, hydrotropism and gravitropism. Phototropism is a plant response to light.
Thigmotropism is a plant response to touch. This is observed when a Venus flytrap closes its trap when an insect enters or when plants coils
around a pole. Hydrotropism is a plant response to water. Gravitropism is a plant response to gravity. This type of response will be positive or
negative depending on the part of the plant. The downward growth of roots is a positive tropism. A stem growing upwards away from gravity is
a negative tropism.
Questions:
1. Identify a plant’s response to external stimuli.
4. Identify the human system plant responses can compare to. Support
2. Identify a plant hormone involved in plant responses.
your answer.
3. Contrast positive and negative tropisms.
5. Identify four types of tropisms, the stimuli each responds to and whether they
are positive or negative responses.
Plant Tropisms Reading ISA (B)
Direction: Read the text below. Use textual evidence to answer questions 1 – 5 on the loose-leaf below.
All organisms respond to stimuli. Auxins are a type of plant hormone that causes plant stems and leaves to grow towards a stimulus. A
plant response to an external stimulus is known as a tropism. A positive tropism occurs when the plant grows towards the stimulus. A negative
tropism occurs when the plant grows away from the stimulus.
Positive tropisms include phototropism, thigmotropism, hydrotropism and gravitropism. Phototropism is a plant response to light.
Thigmotropism is a plant response to touch. This is observed when a Venus flytrap closes its trap when an insect enters or when plants coils
around a pole. Hydrotropism is a plant response to water. Gravitropism is a plant response to gravity. This type of response will be positive or
negative depending on the part of the plant. The downward growth of roots is a positive tropism. A stem growing upwards away from gravity is
a negative tropism.
Questions:
1. Identify a plant’s response to external stimuli.
4. Identify the human system plant responses can compare to. Support
2. Identify a plant hormone involved in plant responses.
your answer.
3. Contrast positive and negative tropisms.
5. Identify four types of tropisms, the stimuli each responds to and whether they
are positive or negative responses.
Plant Tropisms Reading ISA (A)
Direction: Read the text below. Use textual evidence to answer questions 1 – 5 on the loose-leaf below.
All organisms respond to stimuli. Auxins are a type of plant hormone that causes plant stems and leaves to grow towards a
stimulus. A plant response to an external stimulus is known as a tropism. A positive tropism occurs when the plant grows
TOWARDS the stimulus. A negative tropism occurs when the plant grows AWAY from the stimulus.
Positive tropisms include phototropism, thigmotropism, hydrotropism and gravitropism. Phototropism is a plant
response to light. Thigmotropism is a plant response to touch. This is observed when a Venus flytrap closes its trap when an
insect enters or when plants coils around a pole. Hydrotropism is a plant response to water. Gravitropism is a plant response
to gravity. This type of response will be positive or negative depending on the part of the plant. The downward growth of
roots is a positive tropism. A stem growing upwards away from gravity is a negative tropism.
Questions:
1. What is plant response to external stimuli called?
2. What is a plant hormone involved in plant responses called?
3. What is the DIFFERENCE between a positive and negative tropism?
4. Which human system are plant responses similar to? (Hint…which system produces hormones?)
5. For each tropism, identify the stimulus and whether it is positive or negative response.
a. Phototropism
b. Thigmotropism
c. Hydrotropism
d. Gravitropism
Plant Tropisms Reading ISA (A)
Direction: Read the text below. Use textual evidence to answer questions 1 – 5 on the loose-leaf below.
All organisms respond to stimuli. Auxins are a type of plant hormone that causes plant stems and leaves to grow towards a
stimulus. A plant response to an external stimulus is known as a tropism. A positive tropism occurs when the plant grows
TOWARDS the stimulus. A negative tropism occurs when the plant grows AWAY from the stimulus.
Positive tropisms include phototropism, thigmotropism, hydrotropism and gravitropism. Phototropism is a plant
response to light. Thigmotropism is a plant response to touch. This is observed when a Venus flytrap closes its trap when an
insect enters or when plants coils around a pole. Hydrotropism is a plant response to water. Gravitropism is a plant response
to gravity. This type of response will be positive or negative depending on the part of the plant. The downward growth of
roots is a positive tropism. A stem growing upwards away from gravity is a negative tropism.
Questions:
1. What is plant response to external stimuli called?
2. What is a plant hormone involved in plant responses called?
3. What is the DIFFERENCE between a positive and negative tropism?
4. Which human system are plant responses similar to? (Hint…which system produces hormones?)
5. For each tropism, identify the stimulus and whether it is positive or negative response.
a. Phototropism
b. Thigmotropism
c. Hydrotropism
d. Gravitropism
Plant Tropisms Reading ISA (A)
Direction: Read the text below. Use textual evidence to answer questions 1 – 5 on the loose-leaf below.
All organisms respond to stimuli. Auxins are a type of plant hormone that causes plant stems and leaves to grow towards a
stimulus. A plant response to an external stimulus is known as a tropism. A positive tropism occurs when the plant grows
TOWARDS the stimulus. A negative tropism occurs when the plant grows AWAY from the stimulus.
Positive tropisms include phototropism, thigmotropism, hydrotropism and gravitropism. Phototropism is a plant
response to light. Thigmotropism is a plant response to touch. This is observed when a Venus flytrap closes its trap when an
insect enters or when plants coils around a pole. Hydrotropism is a plant response to water. Gravitropism is a plant response
to gravity. This type of response will be positive or negative depending on the part of the plant. The downward growth of
roots is a positive tropism. A stem growing upwards away from gravity is a negative tropism.
Questions:
1. What is plant response to external stimuli called?
2. What is a plant hormone involved in plant responses called?
3. What is the DIFFERENCE between a positive and negative tropism?
4. Which human system are plant responses similar to? (Hint…which system produces hormones?)
5. For each tropism, identify the stimulus and whether it is positive or negative response.
a. Phototropism
b. Thigmotropism
c. Hydrotropism
d. Gravitropism