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1. BHARATHA DEVI ENGLISH HIGH
SCHOOL
B.ASHRAF ALI
9TH
STD

2. TROPIC MOVEMENT:
INDEX:
🔮 DEFINITION
🔮KEY CHARACTERISTICS
🔮 TYPES
🔮 EXAMPLES
🔮 SIGNIFICANCE
🔮 FLOW CHART

3. TROPIC MOVEMENT:
DEFINITION:
TROPIC MOVEMENT IS A DIRECTIONAL GROWTH
RESPONSE BY A PLANT TO AN EXTERNAL STIMULUS,
EITHER GROWING TOWARDS IT (POSITIVE TROPISM) OR
AWAY FROM IT (NEGATIVE TROPISM). EXAMPLES OF
STIMULI INCLUDE LIGHT (PHOTOTROPISM), GRAVITY
(GEOTROPISM/GRAVITROPISM), WATER
(HYDROTROPISM), AND TOUCH (THIGMOTROPISM),
EACH LEADING TO A SPECIFIC GROWTH PATTERN, SUCH
AS A PLANT STEM GROWING TOWARD LIGHT OR
ROOTS GROWING DOWN INTO THE SOIL.

4. KEY CHARACTERISTICS:
CHARACTERISTICS OF TROPIC MOVEMENTS
DIRECTIONAL GROWTH: UNLIKE NASTIC
MOVEMENTS, WHICH ARE NON-DIRECTIONAL,
TROPIC MOVEMENTS ARE ALWAYS IN A
SPECIFIC DIRECTION RELATED TO THE
STIMULUS.
• RESPONSE TO STIMULI: THESE MOVEMENTS
ARE A RESPONSE TO EXTERNAL CUES FROM
THE ENVIRONMENT, WHICH ARE ESSENTIAL
FOR A PLANT’S SURVIVAL AND GROWTH.

5. TYPES
TYPES OF TROPIC MOVEMENTS
PHOTOTROPISM: A PLANT’S GROWTH IN RESPONSE TO LIGHT.
SHOOTS TYPICALLY SHOW POSITIVE PHOTOTROPISM, BENDING
TOWARDS LIGHT, WHILE ROOTS SHOW NEGATIVE PHOTOTROPISM,
BENDING AWAY.
GRAVITROPISM (GEOTROPISM): THE GROWTH RESPONSE OF PLANTS
TO GRAVITY. ROOTS EXHIBIT POSITIVE GRAVITROPISM, GROWING
DOWNWARD, AND SHOOTS SHOW NEGATIVE GRAVITROPISM,
GROWING UPWARD.
HYDROTROPISM: A PLANT’S DIRECTIONAL GROWTH IN RESPONSE TO
WATER. ROOTS OFTEN GROW TOWARD A WATER SOURCE, EVEN
OVERCOMING THE PULL OF GRAVITY, AS SEEN IN POSITIVE
HYDROTROPISM.
• THIGMOTROPISM: THE GROWTH RESPONSE TO TOUCH OR
CONTACT. CLIMBING PLANTS, LIKE VINES, DEMONSTRATE POSITIVE
THIGMOTROPISM BY COILING AROUND AN OBJECT THEY TOUCH.

6. EXAMPLES:
EXAMPLES OF TROPIC MOVEMENTS
PHOTOTROPISM: THE BENDING OF SHOOTS OR STEMS TOWARDS A
LIGHT SOURCE TO MAXIMIZE PHOTOSYNTHESIS, AND ROOTS GROWING
AWAY FROM LIGHT.
GEOTROPISM (OR GRAVITROPISM): ROOTS GROWING DOWNWARDS IN
RESPONSE TO GRAVITY (POSITIVE GEOTROPISM) AND SHOOTS
GROWING UPWARDS, AGAINST GRAVITY (NEGATIVE GEOTROPISM).
THIGMOTROPISM: THE COILING OF TENDRILS AROUND A SUPPORT, LIKE
THAT OF A MONEY PLANT, IN RESPONSE TO TOUCH.
HYDROTROPISM: THE GROWTH OF ROOTS TOWARDS A SOURCE OF
WATER, ENSURING ACCESS TO MOISTURE FOR THE PLANT.
• CHEMOTROPISM: THE GROWTH OF POLLEN TUBES TOWARDS THE
OVULE IN RESPONSE TO CHEMICAL SIGNALS, FACILITATING
FERTILIZATION.

7. SIGNIFICANCE:
SIGNIFICANCE OF TROPIC MOVEMENTS
RESOURCE ACQUISITION: TROPISMS ENSURE THAT PLANTS CAN
ACCESS NECESSARY RESOURCES FOR SURVIVAL, SUCH AS LIGHT
FOR ENERGY PRODUCTION AND WATER AND NUTRIENTS FROM
THE SOIL.
GROWTH AND DEVELOPMENT: BY DIRECTING GROWTH
APPROPRIATELY, THESE MOVEMENTS SUPPORT THE OVERALL
GROWTH AND DEVELOPMENT OF THE PLANT’S SHOOTS, ROOTS,
AND LEAVES.
SUPPORT AND STABILITY: THIGMOTROPISM HELPS CLIMBING
PLANTS GROW TALLER AND FIND SUPPORT, WHILE GEOTROPISM
PROVIDES STRONG ROOTS TO ANCHOR THE PLANT IN THE SOIL.
• REPRODUCTION: CHEMOTROPISM IS VITAL FOR SUCCESSFUL
REPRODUCTION, GUIDING POLLEN TUBES TO THEIR TARGET
FOR FERTILIZATION.

8. FLOW CHART:

9. THANK YOU
🙏🏻