Below are statements about plant development and phenology. Which of the following statements are NOT correct?

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BlackTom AI · Accepted Answer

To evaluate the statements about plant development and phenology, I will assess each option on its own merits and connect it to general phenological principles.
Option 1: "Late-maturing plants are not sensitive to day length, and often do not require vernalisation." This is incorrect because many late-maturing crops still show photoperiod sensitivity and may require vernalisation or exposure to cold to initiate flowering, depending on species and ecotype. The idea that late maturity equates to insensitivity to day length contradicts the well-established role of photoperiod and vernalisation in triggering developmental transitions.
Option 2: "Maximal yield potential of barley can be determined based on the spikelet stage." This statement is problematic. While spikelet development is correlated with yield components, maximal yield potential is typically determined by a combination of factors including head development, grain filling, spacing, and environmental interactions; relying solely on spikelet stage oversimplifies the complexity of yield formation in barley. Therefore, this claim is not fully correct as stated.
Option 3: "True spring crops do not need to be exposed to low temperature to start flowering." This is generally inaccurate. True spring crops are bred to flower with minimal vernalisation requirements, but many crops still rely on either photoperiod cues or some degree of cold exposure to initiate flowering, and saying they do not need any cold exposure is an overgeneralization that can be misleading depending on species and variety.
Option 4: "It is important to determine the flowering window to avoid frost risk." This is a valid and widely accepted principle in agronomy and phenology. Knowing when flowering will occur helps manage frost risk, as flowering is particularly sensitive to frost events and timing management practices accordingly is beneficial for yield protection.
Option 5: "The number of leaves is the most important marker to identify the Zadok’s phenological scale for cereals." This claim is inaccurate. Zadoks scale uses specific growth stage codes based on observable cereal development (e.g., shoot growth, stem elongation, booting, heading), but it does not rely on the absolute number of leaves as the primary marker. Leaf count is not the defining criterion for the scale, making this statement incorrect.
In summary, the statements that are NOT correct are 1, 2, 3, and 5 due to overgeneralizations or misrepresentations of flowering triggers, yield determination, and the structure of the Zadoks scale, while statement 4 is a sound principle reflecting the importance of timing to mitigate frost risk.

AGRI20026_2025_SM1 Final Exam Revision - Practice Quiz

Below are statements about plant development and phenology. Which of the following statements are NOT correct?

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