Plant Growth and Development
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A.
Growth towards light
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B.
Growth away from light
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C.
Growth in response to gravity
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D.
Growth in response to water
Solution
Phototropism is the growth of a plant towards light, driven by auxin distribution.
Correct Answer: A — Growth towards light
Q. What is the main function of the cambium in plants?
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A.
Photosynthesis
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B.
Water transport
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C.
Growth in thickness
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D.
Nutrient storage
Solution
The cambium is responsible for secondary growth, allowing plants to increase in thickness.
Correct Answer: C — Growth in thickness
Q. What is the primary function of root hairs?
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A.
Photosynthesis
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B.
Water absorption
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C.
Nutrient storage
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D.
Support
Solution
Root hairs increase the surface area for water and nutrient absorption from the soil.
Correct Answer: B — Water absorption
Q. What is the primary function of stomata in plants?
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A.
Nutrient storage
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B.
Gas exchange
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C.
Water storage
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D.
Support
Solution
Stomata facilitate gas exchange, allowing carbon dioxide in and oxygen out.
Correct Answer: B — Gas exchange
Q. What is the primary function of the cambium in plants?
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A.
Photosynthesis
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B.
Water transport
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C.
Growth in thickness
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D.
Nutrient storage
Solution
The cambium is responsible for secondary growth, allowing plants to increase in thickness.
Correct Answer: C — Growth in thickness
Q. What is the primary hormone responsible for promoting cell elongation in plants?
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A.
Gibberellins
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B.
Auxins
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C.
Cytokinins
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D.
Ethylene
Solution
Auxins are the primary hormones that promote cell elongation, particularly in stems.
Correct Answer: B — Auxins
Q. What is the role of cytokinins in plant growth?
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A.
Promote root growth
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B.
Stimulate cell division
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C.
Inhibit leaf senescence
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D.
All of the above
Solution
Cytokinins stimulate cell division, promote root growth, and inhibit leaf senescence.
Correct Answer: D — All of the above
Q. What is the role of mycorrhizae in plant growth?
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A.
Water storage
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B.
Nutrient absorption
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C.
Photosynthesis
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D.
Gas exchange
Solution
Mycorrhizae enhance nutrient absorption, particularly phosphorus, from the soil.
Correct Answer: B — Nutrient absorption
Q. What is the role of mycorrhizal fungi in plant growth?
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A.
Photosynthesis
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B.
Nutrient absorption
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C.
Water storage
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D.
Pollination
Solution
Mycorrhizal fungi enhance nutrient absorption, particularly phosphorus, for plants.
Correct Answer: B — Nutrient absorption
Q. What is the role of the apical meristem in plants?
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A.
Photosynthesis
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B.
Cell division and growth
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C.
Water absorption
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D.
Nutrient storage
Solution
The apical meristem is responsible for cell division and growth at the tips of roots and shoots.
Correct Answer: B — Cell division and growth
Q. What is the term for the growth response of a plant to light?
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A.
Thigmotropism
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B.
Phototropism
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C.
Hydrotropism
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D.
Gravitropism
Solution
Phototropism is the growth response of a plant to light, typically resulting in bending towards the light source.
Correct Answer: B — Phototropism
Q. What is the term for the process by which plants lose water vapor through small openings in their leaves?
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A.
Transpiration
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B.
Respiration
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C.
Photosynthesis
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D.
Germination
Solution
Transpiration is the process of water vapor loss from plant leaves through stomata.
Correct Answer: A — Transpiration
Q. Which environmental factor is most critical for seed germination?
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A.
Light
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B.
Temperature
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C.
Soil type
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D.
Humidity
Solution
Temperature is a critical factor for seed germination, as it affects metabolic processes.
Correct Answer: B — Temperature
Q. Which of the following is NOT a macronutrient essential for plant growth?
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A.
Nitrogen
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B.
Phosphorus
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C.
Potassium
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D.
Iron
Solution
Iron is a micronutrient, while nitrogen, phosphorus, and potassium are macronutrients.
Correct Answer: D — Iron
Q. Which of the following is NOT a phase of plant growth?
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A.
Maturation
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B.
Germination
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C.
Juvenile
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D.
Reproductive
Solution
Maturation is not a recognized phase of plant growth; the main phases are germination, juvenile, and reproductive.
Correct Answer: A — Maturation
Q. Which phase of the plant life cycle is characterized by the formation of gametes?
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A.
Sporophyte
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B.
Gametophyte
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C.
Seedling
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D.
Mature plant
Solution
The gametophyte phase is where gametes are produced in the plant life cycle.
Correct Answer: B — Gametophyte
Q. Which plant structure is primarily responsible for anchoring the plant and absorbing water and nutrients?
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A.
Stem
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B.
Leaf
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C.
Root
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D.
Flower
Solution
Roots anchor the plant and are responsible for water and nutrient absorption.
Correct Answer: C — Root
Q. Which plant structure is primarily responsible for nutrient storage?
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A.
Roots
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B.
Leaves
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C.
Stems
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D.
Flowers
Solution
Roots are primarily responsible for nutrient storage in many plants.
Correct Answer: A — Roots
Q. Which plant structure is primarily responsible for reproduction?
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A.
Roots
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B.
Leaves
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C.
Flowers
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D.
Stems
Solution
Flowers are the reproductive structures of angiosperms, facilitating pollination and seed formation.
Correct Answer: C — Flowers
Q. Which process involves the conversion of light energy into chemical energy in plants?
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A.
Respiration
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B.
Photosynthesis
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C.
Transpiration
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D.
Fermentation
Solution
Photosynthesis is the process that converts light energy into chemical energy in the form of glucose.
Correct Answer: B — Photosynthesis
Q. Which stage of the plant life cycle is characterized by the formation of gametes?
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A.
Sporophyte
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B.
Gametophyte
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C.
Seedling
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D.
Mature plant
Solution
The gametophyte stage is where gametes are produced in the plant life cycle.
Correct Answer: B — Gametophyte
Q. Which structure is responsible for the production of pollen in flowering plants?
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A.
Stigma
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B.
Anther
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C.
Ovary
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D.
Style
Solution
The anther is the part of the stamen that produces pollen in flowering plants.
Correct Answer: B — Anther
Q. Which type of plant growth occurs at the tips of roots and shoots?
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A.
Lateral growth
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B.
Primary growth
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C.
Secondary growth
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D.
Apical growth
Solution
Primary growth occurs at the tips of roots and shoots, leading to an increase in length.
Correct Answer: B — Primary growth
Q. Which type of plant growth occurs in response to environmental stimuli?
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A.
Primary growth
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B.
Secondary growth
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C.
Tropic growth
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D.
Lateral growth
Solution
Tropic growth refers to directional growth in response to environmental stimuli, such as light or gravity.
Correct Answer: C — Tropic growth
Q. Which type of plant is characterized by having a vascular system?
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A.
Mosses
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B.
Ferns
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C.
Liverworts
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D.
Algae
Solution
Ferns are vascular plants, possessing a vascular system for transporting water and nutrients.
Correct Answer: B — Ferns
Q. Which type of plant reproduction involves the use of spores?
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A.
Asexual reproduction
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B.
Sexual reproduction
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C.
Vegetative reproduction
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D.
Grafting
Solution
Sexual reproduction in plants often involves the production of spores, especially in ferns and mosses.
Correct Answer: B — Sexual reproduction
Q. Which type of plant tissue is responsible for the transport of water and minerals?
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A.
Phloem
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B.
Xylem
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C.
Cortex
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D.
Pith
Solution
Xylem is the tissue responsible for transporting water and minerals from roots to other parts of the plant.
Correct Answer: B — Xylem
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