Prepare for NEET Biology Plant Growth and Development with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert insights on plant hormones and growth regulators.
The process of organogenesis in vertebrate embryos is heavily influenced by epithelial-mesenchymal transitions (EMTs). Which of the following is NOT a characteristic feature of EMT during organogenesis?
Loss of cell adhesion molecules.
Increased cell motility.
Increased cell proliferation within the epithelium.
Degradation of the extracellular matrix.
Which of the following combinations of plant growth regulators are antagonistic in their action on apical dominance?
Auxin and Gibberellin
Cytokinin and Ethylene
Gibberellin and Abscisic Acid
Auxin and Cytokinin
The ratio of ABA to GA in a dormant seed is typically high. Which of the following changes during seed germination is MOST directly responsible for shifting this balance and promoting growth?
Increased ABA degradation and decreased GA degradation.
Increased GA biosynthesis and decreased ABA biosynthesis.
Transport of ABA out of the embryo and GA into the embryo.
Inactivation of ABA receptors and activation of GA receptors.
A researcher observes that a batch of dormant seeds fails to germinate even after scarification and exposure to favorable conditions. Suspecting the presence of a volatile inhibitor, which experimental setup is MOST appropriate to confirm this hypothesis?
Grind the dormant seeds and apply the extract to non-dormant seeds.
Place the dormant seeds in a closed container with non-dormant seeds of a different species and observe germination rates.
Expose the dormant seeds to high concentrations of ethylene gas.
Soak the dormant seeds in a solution of gibberellic acid.
Which of the following best describes the relationship between arithmetic growth and geometric growth in a typical organism's life cycle?
Arithmetic growth and geometric growth occur simultaneously.
Geometric growth always precedes arithmetic growth.
Arithmetic growth always precedes geometric growth.
Arithmetic growth often precedes or follows a period of geometric growth.
The stable change in the plant brought about by vernalisation is believed to be:
Genetic
Physiological
Epigenetic
Morphological
If a vernalised plant is grafted onto a non-vernalised plant, and the latter subsequently flowers, this suggests that:
Vernalisation is not necessary for flowering.
The grafting process itself induces flowering.
A transmissible floral stimulus is produced during vernalisation.
Low temperatures are transmitted through the graft.
If a plant's leaves were covered, preventing light exposure, which process related to flowering would be most directly affected?
Photoperiodism
Photosynthesis
Transpiration
Respiration
If a plant exhibits minimal changes in its physical characteristics despite significant changes in nutrient levels in the soil, it can be said to have low:
Plasticity
Adaptability
Resilience
Tolerance
A scientist is culturing leaf mesophyll cells. The cells lose their specialized features and form an unorganized mass. This is NOT an example of:
Dedifferentiation
Callus formation
Cellular totipotency
Differentiation
