MCQ 91:
Which of the following plant hormones is primarily involved in stem elongation?
A) Gibberellin
B) Ethylene
C) Auxin
D) Cytokinin
Answer: A) Gibberellin
Explanation: Gibberellins promote stem elongation and growth by stimulating cell division and elongation.
MCQ 92:
Which of the following structures in plants is involved in gas exchange?
A) Stomata
B) Xylem
C) Phloem
D) Meristem
Answer: A) Stomata
Explanation: Stomata are small openings on the leaf surface that facilitate gas exchange (oxygen and carbon dioxide).
MCQ 93:
Which of the following types of plants can be described as having a thick cuticle and reduced leaf surface area?
A) Mesophytes
B) Xerophytes
C) Hydrophytes
D) Halophytes
Answer: B) Xerophytes
Explanation: Xerophytes are adapted to conserve water in arid environments, often featuring a thick cuticle and reduced leaf surface area.
MCQ 94:
Which part of the plant is primarily involved in nutrient transport?
A) Xylem
B) Phloem
C) Roots
D) Leaves
Answer: B) Phloem
Explanation: Phloem is responsible for the transport of nutrients, particularly sugars produced during photosynthesis.
MCQ 95:
Which plant structure is responsible for producing seeds?
A) Stamen
B) Ovary
C) Petal
D) Sepal
Answer: B) Ovary
Explanation: The ovary contains ovules, which develop into seeds after fertilization.
MCQ 96:
Which of the following is a function of chlorophyll in plants?
A) Absorb sunlight
B) Store energy
C) Conduct water
D) Produce oxygen
Answer: A) Absorb sunlight
Explanation: Chlorophyll is the pigment that absorbs sunlight, enabling photosynthesis.
MCQ 97:
Which of the following plant groups does not produce seeds?
A) Angiosperms
B) Gymnosperms
C) Pteridophytes
D) Both B and C
Answer: D) Both B and C
Explanation: Both gymnosperms and pteridophytes (ferns) do not produce seeds; gymnosperms produce naked seeds, while pteridophytes reproduce via spores.
MCQ 98:
Which of the following structures in a flower is typically involved in pollen transfer?
A) Ovule
B) Stigma
C) Anther
D) Petal
Answer: C) Anther
Explanation: The anther produces pollen, which is transferred to the stigma during pollination.
MCQ 99:
Which part of the flower is responsible for receiving pollen?
A) Stamen
B) Pistil
C) Sepal
D) Petal
Answer: B) Pistil
Explanation: The pistil, which includes the stigma, is responsible for receiving pollen during fertilization.
MCQ 100:
Which part of the plant is primarily involved in nutrient absorption?
A) Leaves
B) Stems
C) Roots
D) Flowers
Answer: C) Roots
Explanation: Roots are the main structures for nutrient absorption from the soil.
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