Podcast
Questions and Answers
Which factor does NOT influence the growth of plants?
Which factor does NOT influence the growth of plants?
- Day length
- Soil pH (correct)
- Temperature
- Light intensity
What term describes a plant's growth response towards a water source?
What term describes a plant's growth response towards a water source?
- Chemotropism
- Thigmotropism
- Hydrotropism (correct)
- Geotropism
Which growth regulator is commonly used to promote fruit ripening?
Which growth regulator is commonly used to promote fruit ripening?
- Gibberellin
- Ethene (correct)
- Cytokinin
- Auxin
Which of the following best defines geotropism?
Which of the following best defines geotropism?
What is the primary role of plant promoters?
What is the primary role of plant promoters?
Which structural defense mechanism does a plant employ against herbivores?
Which structural defense mechanism does a plant employ against herbivores?
What is thigmotropism primarily associated with?
What is thigmotropism primarily associated with?
What defines the combined effect of plant growth regulators?
What defines the combined effect of plant growth regulators?
Which of the following is a chemical defense mechanism of plants?
Which of the following is a chemical defense mechanism of plants?
Plants primarily produce growth regulators in which part?
Plants primarily produce growth regulators in which part?
Flashcards
Soil pH (in plant growth)
Soil pH (in plant growth)
Acidity or alkalinity in soil that does NOT affect a plant's development.
Hydrotropism
Hydrotropism
A plant's directional growth response towards a water concentration.
Ethene (Ethylene)
Ethene (Ethylene)
A gaseous plant hormone that promotes fruit ripening, senescence, and abscission.
Geotropism
Geotropism
Signup and view all the flashcards
Plant Promoters
Plant Promoters
Signup and view all the flashcards
Thick Bark
Thick Bark
Signup and view all the flashcards
Thigmotropism
Thigmotropism
Signup and view all the flashcards
Combined effect of Plant Growth Regulators
Combined effect of Plant Growth Regulators
Signup and view all the flashcards
Tannin production in plant defense
Tannin production in plant defense
Signup and view all the flashcards
Meristem
Meristem
Signup and view all the flashcards
Study Notes
External Factors Regulating Plant Growth
- Light intensity and day length impact photosynthesis and growth patterns.
- Gravity directs root and shoot orientation, essential for nutrient and water uptake.
- Temperature influences metabolic rates and seasonal growth cycles.
Tropisms
- Tropism refers to directional growth responses of plants to external stimuli.
- Phototropism: growth towards light to enhance photosynthesis.
- Geotropism: roots grow downward in response to gravity, while shoots grow upward.
- Hydrotropism: roots grow towards areas of higher water availability.
- Thigmotropism: plants like vines respond to touch, enabling support through wrapping.
- Chemotropism: growth in response to chemical signals in the environment.
Plant Growth Regulators (PGRs)
- PGRs are chemicals that influence plant growth processes.
- They are produced in meristematic tissues, the regions of active cell division.
- The combined effect of different PGRs alters growth patterns efficiently.
- Promoters stimulate various growth processes within plants.
Applications of Plant Growth Regulators
- Ethene is used to ripen fruit, enhancing marketability and shelf life.
- Auxin is effective in weed control, disrupting the normal growth of unwanted plants.
Plant Defensive Mechanisms
- Plants must protect against water loss, overheating, infection, and herbivore attacks.
- Structural defenses: Bark acts as a barrier against pathogens, while stinging cells deter herbivores.
- Chemical defenses: Tannins render leaves unpalatable, and toxic chemicals prevent larval development.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
