Q41. Which plant division includes plants commonly used for their nectar as a food source for pollinators?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Angiosperms commonly produce nectar, a sugary fluid, as a reward for pollinators such as bees, butterflies, and birds, thus facilitating pollination.
Q42. Which plant division includes plants that often have specialized structures called “stomata” for gas exchange?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Angiosperms have specialized structures called stomata on their leaves and stems, which regulate gas exchange by controlling the passage of carbon dioxide, oxygen, and water vapor.
Q43. Which plant division includes plants that reproduce via seeds enclosed within a hard, woody cone?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: c) Gymnosperms
Explanation: Gymnosperms reproduce via seeds that are not enclosed within a fruit. Instead, they are typically found on the surface of cone-like structures, as seen in conifers like pine trees.
Q44. Which plant division includes plants that often have leaves with parallel venation?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Angiosperms commonly have leaves with parallel venation, where the veins run parallel to each other along the length of the leaf blade, as observed in grasses like maize and wheat.
Q45. Which plant division includes plants that often have flowers with bilateral symmetry?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Angiosperms exhibit a wide range of flower morphologies, including bilateral symmetry, where a single plane divides the flower into mirror-image halves, as seen in many orchids and irises.
Q46. Which plant division includes plants that commonly form associations with nitrogen-fixing bacteria in root nodules?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Certain angiosperms, such as legumes like peas and beans, form symbiotic relationships with nitrogen-fixing bacteria (e.g., Rhizobium spp.) in specialized root nodules, enabling them to convert atmospheric nitrogen into a usable form for plant growth.
Q47. Which plant division includes plants that often exhibit secondary growth, resulting in the formation of woody stems?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Angiosperms frequently exhibit secondary growth, characterized by the production of woody tissues such as xylem and phloem, resulting in the formation of thick, woody stems and trunks.
Q48. Which plant division includes plants that often have specialized reproductive structures called “sporangia” for spore production?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: b) Pteridophyta
Explanation: Pteridophyta, or ferns and their allies, have specialized reproductive structures called sporangia, which are typically found on the undersides of fronds and produce spores for reproduction.
Q49. Which plant division includes plants that commonly form mycorrhizal associations with fungi to enhance nutrient uptake?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Many angiosperms form symbiotic relationships with fungi called mycorrhizae, which colonize the plant roots and enhance nutrient uptake, particularly phosphorus and nitrogen, from the soil.
Q50. Which plant division includes plants that often have flowers with radial symmetry?
a) Bryophyta
b) Pteridophyta
c) Gymnosperms
d) Angiosperms
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Correct Answer: d) Angiosperms
Explanation: Angiosperms exhibit a wide range of flower morphologies, including radial symmetry, where multiple planes can divide the flower into equal halves, as observed in many roses and daisies.