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

Question

BlackTom AI · Accepted Answer

Exploring the statements about plant development and phenology, we assess each item for accuracy and identify which are not correct.
Option 1: 'Late-maturing plants are not sensitive to day length, and often do not require vernalisation.' This claim contradicts common knowledge about cereal and other temperate crops, where vernalisation requirements and photoperiod sensitivity often influence developmental timing, especially for winter or late-maturing varieties. In many species, vernalisation and day-length cues are important triggers for transitions to flowering, so asserting a lack of sensitivity is misleading and generally incorrect.
Option 2: 'The number of leaves is the most important marker to identify the Zadok’s phenological scale for cereals.' The Zadok’s scale is a detailed, standardized framework describing growth stages from emergence to ripening, with stages defined by a combination of leaf appearance, stem and spike development, and reproductive milestones. While leaf number is one aspect of early development, it is not the single most important marker for identifying the full Zadoks scale; several stages rely on stem elongation, ear/inflorescence development, and reproductive transitions. Therefore, this statement overemphasizes leaves and is not correct.
Option 3: 'True spring crops do not need to be exposed to low temperature to start flowering.' This reflects a general distinction: true spring crops typically do not require vernalisation (exposure to prolonged cold) to initiate flowering, unlike winter crops that do require cold exposure. If interpreted in a typical agronomic context, this statement is correct and aligns with the behavior of true spring varieties. Since the task is to identify NOT correct statements, this option is not one of them.
Option 4: 'It is important to determine the flowering window to avoid frost risk.' This is a sound agronomic principle: knowing when flowering occurs helps manage frost risk, mobility of temperature fluctuations, and crop protection measures. It is a correct and practical statement.
Option 5: 'Maximal yield potential of barley can be determined based on the spikelet stage.' In barley and similar cereals, spikelet development and resulting grain number strongly influence yield potential, so linking maximal yield to spikelet stage is a valid concept. This is a correct statement.

Summary of the evaluation: Options 1 and 3 are inconsistent with the premise that some crops rely on vernalisation and photoperiod cues (making 1 not correct), and that leaf number alone does not define the Zadoks scale (making 3 not correct).

AGRI20026_2025_SM1 Practice Quiz for Final Exam 2025

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

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