Prepare for NEET Biology Morphology of Flowering Plants with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert explanations of plant structures.
Which of the following statements regarding the anomalous secondary growth in Boerhaavia is INCORRECT?
A variant of cambium outside the vascular bundles
Concentric rings of secondary vascular bundles
Presence of medullary bundles
Inverted vascular bundles
In a dicot stem undergoing secondary growth, which tissue is primarily responsible for the increase in girth?
Cork Cambium
Vascular Cambium
Apical Meristem
Intercalary Meristem
The 'open' vascular bundles found in dicot stems are characterized by:
Scattered arrangement of xylem and phloem with no cambium.
The presence of cambium between xylem and phloem, allowing for secondary growth.
Joint, collateral arrangement of xylem and phloem with no cambium.
Concentric arrangement of xylem and phloem.
In which of the following plants does the stem perform the primary function of photosynthesis?
Ficus
Opuntia
Hibiscus
Mangifera
Which of the following is NOT a function of lenticels?
Gaseous exchange
Transport of water and minerals
Transpiration
Removal of excess water in some plants
The arrangement of vascular bundles in a monocot stem is best described as:
Arranged in a ring
Scattered
Bicollateral
Amphicribral
A plant exhibiting Kranz anatomy experiences a sudden drop in atmospheric CO2 levels. Which of the following is the MOST LIKELY immediate consequence on its photosynthetic efficiency?
Reduced initial fixation of CO2 by PEP carboxylase in mesophyll cells.
Increased oxygenation of RuBisCO in bundle sheath cells.
Immediate cessation of the Calvin cycle in bundle sheath cells.
Enhanced activity of photorespiration in mesophyll cells.
Which specific adaptation in the leaves of submerged hydrophytes contributes MOST significantly to their buoyancy and flexibility in water currents?
Highly dissected leaves
Absence of stomata
Presence of extensive aerenchyma
Thin cuticle
In a CAM plant undergoing a prolonged drought, which physiological change would be MOST prominent in its leaves during the daytime?
Stomata open, and CO2 is directly fixed by RuBisCO.
Stomata remain closed, and malate is decarboxylated to release CO2.
Stomata partially open, and PEP carboxylase fixes atmospheric CO2.
Stomata remain closed, and the Calvin cycle ceases completely.
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.
