Below are statements about plant development and phenology. Which of the following statements are NOT correct? Select 2 answers.

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Question restatement: You’re evaluating five statements about plant development and phenology to identify which two are NOT correct.
Option 1: 'True spring crops do not need to be exposed to low temperature to start flowering.' This aligns with the definition of spring-sown or spring cereal varieties, which are bred to bypass vernalization requirements; as a result, the statement is generally correct and reflects that spring crops can initiate flowering without cold exposure. Therefore, this option is not one of the NOT-correct statements.
Option 2: 'Late-maturing plants are not sensitive to day length, and often do not require vernalisation.' This claim goes against common phenological understanding. In many crops, late-maturing types still exhibit photoperiod sensitivity and may require vernalization or specific day-length cues to transition to flowering. Claiming no photoperiod sensitivity and no vernalisation need is misleading and incorrect. Hence, this option is NOT correct.
Option 3: 'It is important to determine the flowering window to avoid frost risk.' This reflects a practical agronomic consideration: knowing when flowering occurs helps managers reduce frost damage and align agricultural practices, so the statement is correct and not a NOT-correct choice.
Option 4: 'The number of leaves is the most important marker to identify the Zadok’s phenological scale for cereals.' The Zadoks scale describes growth stages primarily through specific developmental landmarks such as leaf emergence, stem elongation, booting, heading, flowering, and grain development. While leaf appearance is part of the scale, saying the 'number of leaves' is the most important marker overstates its role and oversimplifies the scale. This makes the statement inaccurate. Therefore, this option is NOT correct.
Option 5: 'Maximal yield potential of barley can be determined based on the spikelet stage.' Spikelet formation and its progression are closely tied to potential yield components in cereals; assessing spikelet development can inform yield potential, so this statement is correct.
In summary, option 2 is incorrect because it falsely dismisses photoperiod sensitivity and vernalisation needs in late-maturing plants, option 4 is incorrect because it overemphasizes leaf count as the primary marker of the Zadoks scale. The remaining statements (1, 3, and 5) describe widely accepted concepts in cereal phenology and yield prediction. The two NOT-correct statements, by this reasoning, are 2 and 4.

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? Select 2 answers.

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