GS Biology Questions and Answers

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Q271
Bulliform cells are present
  • A In upper epidermis of dicot leaves
  • B In lower epidermis of monocot leaves
  • C In upper epidermis of monocot leaves
  • D In dicot stem
Answer: Option C
Explanation: Bulliform cells help in leaf folding and are found in monocot upper epidermis.
Q272
The youngest layer of secondary phloem in woody dicot stem is located
  • A Just outside the vascular cambium
  • B Just on the inner side of cambium
  • C Between periderm and primary cortex
  • D Just outside pith
Answer: Option A
Explanation: Secondary phloem forms just outside the vascular cambium.
Q273
The wall of cork cells is mostly impregnated with
  • A Cutin
  • B Suberin
  • C Lignin
  • D Hemicellulose
Answer: Option B
Explanation: Cork cell walls contain suberin making them waterproof.
Q274
Cork cells are
  • A Photosynthetic
  • B Elongated and participate in movement
  • C Meristematic
  • D Dead
Answer: Option D
Explanation: Cork cells are dead at maturity providing protection.
Q275
Dendrochronology is the study of
  • A Height of a tree
  • B Age of a tree by counting annual rings
  • C Diameter of a tree
  • D Number of leaves in a tree
Answer: Option B
Explanation: Dendrochronology determines age through tree rings analysis.
Q276
The best method to determine the age of a tree is
  • A To measure its diameter
  • B To count the number of leaves
  • C To count the number of annual rings at the base
  • D To measure its height
Answer: Option C
Explanation: Counting annual growth rings provides precise tree age.
Q277
If a sign was nailed 5 feet above ground in 1997, and tree grows 4 inches annually, how high will the sign be in 2007?
  • A 5 feet
  • B 8 feet
  • C 4 feet 8 inches
  • D 9 feet 4 inches
Answer: Option A
Explanation: The sign’s height remains fixed on the tree trunk.
Q278
Safranin stains which element of tissues?
  • A Starch elements
  • B Lignified elements
  • C Bast
  • D Protein elements
Answer: Option B
Explanation: Safranin stains lignified cell walls red.
Q279
Which tissue forms the thin surface for gas exchange in lungs?
  • A Epithelial
  • B Connective
  • C Nervous
  • D Muscle
Answer: Option A
Explanation: Epithelial tissue forms thin layers for gas exchange.
Q280
Endothelium of the inner surface of blood vessels is
  • A Simple squamous epithelium
  • B Columnar epithelium
  • C Cuboidal epithelium
  • D Ciliated cells
Answer: Option A
Explanation: Simple squamous epithelium provides smooth lining for vessels.

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