GS Biology Questions and Answers

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Q221
Mesophyll tissue is well differentiated into spongy tissue and palisade tissue in
  • A Dicot leaves
  • B Ophytic stem
  • C Hydrophytic stem
  • D Monocot leaves
Answer: Option A
Explanation: Dicot leaves have distinct layers of spongy and palisade mesophyll for efficient photosynthesis.
Q222
Lateral meristem is responsible for
  • A Growth in parenchyma
  • B Growth in thickness
  • C Growth in cortex
  • D Growth in length
Answer: Option B
Explanation: Lateral meristem causes secondary growth, increasing thickness of stems and roots.
Q223
As a tree grows older, which increases more rapidly in thickness?
  • A Sapwood
  • B Cortex
  • C Phloem
  • D Heartwood
Answer: Option D
Explanation: Heartwood or inner dead wood increases with age, making up the bulk of older trees.
Q224
What is the other name for cork tissue?
  • A Phellogen
  • B Phelloderm
  • C Phellem
  • D Periderm
Answer: Option C
Explanation: Cork tissue or phellem forms the protective outer layer on stems and roots.
Q225
Commercial cork is obtained from the species of
  • A Berberis
  • B Quercus
  • C Salix
  • D Betula
Answer: Option B
Explanation: Cork oak (Quercus species) is the primary commercial source of cork.
Q226
The cross-section of a trunk of a tree showed 50 annual rings. The age of tree is
  • A 50 years
  • B 50 months
  • C 100 years
  • D 25 years
Answer: Option A
Explanation: Each annual ring represents one year of growth in trees.
Q227
Trees at seashore do not have annual rings because
  • A There is climatic variation
  • B There is no marked climatic variation
  • C There is enough moisture in the atmosphere
  • D Soil is sandy
Answer: Option B
Explanation: Lack of significant seasonal changes at seashores prevents distinct ring formation.
Q228
Grafting is not possible in monocots because they
  • A Have scattered vascular bundles
  • B Have parallel venation
  • C Are herbaceous
  • D Lack cambium
Answer: Option D
Explanation: Monocots lack vascular cambium, which is essential for grafting success.
Q229
A tissue is a
  • A A group of separate organs that are coordinated in their activities
  • B Group of similar cells that function together in a specialized activity
  • C Layer of cells surrounding an organ
  • D Sheet of cells, one layer thick
Answer: Option B
Explanation: A tissue is an organized group of similar cells performing a specific function.
Q230
Which type of tissue forms the inner lining of a blood vessel?
  • A Epithelial
  • B Connective
  • C Muscle
  • D Nervous
Answer: Option A
Explanation: Epithelial tissue lines blood vessels providing a smooth surface for blood flow.

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