Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
The bulliform cells in the leaves of certain grasses play a crucial role in:
Increasing the photosynthetic surface area.
Secreting resinous substances for protection.
Leaf rolling and unfolding in response to water availability.
Storing water for use during drought.
A mutation in a plant affects the development of its palisade parenchyma, significantly reducing the number and length of these cells. Which of the following would be the MOST DIRECT consequence of this mutation on photosynthesis?
Increased rate of photorespiration due to higher oxygen concentration.
Reduced CO2 fixation by RuBisCO in the mesophyll cells.
Decreased light absorption and reduced efficiency of the light-dependent reactions.
Impaired transport of sugars from the source to the sink.
Which structural feature of guard cells facilitates their function in stomatal regulation MOST effectively?
Uniformly thickened cell walls.
Radially oriented cellulose microfibrils in the cell walls.
Large central vacuole for water storage.
Presence of chloroplasts for photosynthesis.
The main function of bulliform cells in grasses is:
To roll the leaf during water stress
Photosynthesis
Gaseous exchange
Storage of water
In a dorsiventral leaf, the location of the palisade parenchyma is:
Towards the adaxial surface
Towards the abaxial surface
Scattered throughout the mesophyll
Absent in dorsiventral leaves
In a monocot leaf, the bulliform cells are primarily responsible for which of the following adaptations?
Increasing the surface area for photosynthesis
Providing structural support to the leaf blade
Storing water for use during drought conditions
Rolling of the leaf during water stress
Which of the following features is NOT directly associated with the parallel venation pattern observed in monocot leaves?
Uniform distribution of vascular bundles throughout the leaf blade
Structural support provided by interconnected veins
Efficient water transport to all parts of the leaf
Enhanced transport of photosynthates via companion cells
The specialized arrangement of mesophyll cells in a typical monocot leaf contributes significantly to its photosynthetic efficiency. How does this arrangement differ from that of a dicot leaf, and what is its primary advantage?
Monocots have tightly packed palisade mesophyll, maximizing light absorption at the upper surface.
Monocots have spongy mesophyll throughout the leaf, enhancing gas exchange.
Monocots typically lack palisade mesophyll, allowing for more uniform light penetration throughout the leaf.
Monocots have a distinct layer of air spaces below the palisade mesophyll, facilitating CO2 diffusion.
Considering the isobilateral nature of most monocot leaves, how does the distribution of stomata differ from that of a typical dorsiventral dicot leaf?
Stomata are absent in monocot leaves.
Stomata are only present on the upper surface in monocots.
Stomata are relatively evenly distributed on both surfaces in monocots, while they are predominantly on the lower surface in dicots.
Stomata are clustered around the vascular bundles in monocots.
The bulliform cells in a dicot leaf primarily contribute to:
Increased photosynthetic efficiency.
Enhanced gaseous exchange.
Leaf rolling or folding during water stress.
Protection against herbivores.
