Essential Conditions for Plant Growth — NEET Biology
📚 Practice ConceptWhy do you not try to write down what you think are necessary conditions for growth? This list may have water, oxygen and nutrients as very essential elements for growth. The plant cells grow in size by cell enlargement which in turn requires water. Turgidity of cells helps in extension growth. Thus, plant growth and further development is intimately linked to the water status of the plant. Water also provides the medium for enzymatic activities needed for growth. Oxygen helps in releasing metabolic energy essential for growth activities. Nutrients (macro and micro essential elements) are required by plants for the synthesis of protoplasm and act as source of energy.
Which of the following statements correctly describe the essential conditions and influencing factors for plant growth and development? S1: Water provides the medium for enzymatic activities and contributes to cell turgidity for extension growth. S2: Oxygen is critical for releasing metabolic energy required for various growth activities within the plant. S3: Both macro and micronutrients are required for protoplasm synthesis and serve as primary energy sources for plant growth. S4: Environmental factors such as light and gravity primarily act as direct metabolic inhibitors, restricting overall plant development. S5: Every plant species possesses an optimum temperature range, deviation from which can be detrimental to its survival and growth. S6: Intrinsic factors like plant growth regulators operate independently of external environmental signals, solely governing internal developmental processes.
View solution & NCERT explanation
Correct answer: C — S1, S2, S3, and S5 only
Let's evaluate each statement based on the NCERT text: S1: "Turgidity of cells helps in extension growth. Thus, plant growth and further development is intimately linked to the water status of the plant. Water also provides the medium for enzymatic activities needed for growth." This statement is correct. S2: "Oxygen helps in releasing metabolic energy essential for growth activities." This statement is correct. S3: "Nutrients (macro and micro essential elements) are required by plants for the synthesis of protoplasm and act as source of energy." This statement is correct. S4: "Environmental signals such as light and gravity also affect certain phases/stages of growth." They influence growth directions and patterns (e.g., tropisms), but are not primarily direct metabolic inhibitors. This statement is incorrect. S5: "every plant organism has an optimum temperature range best suited for its growth. Any deviation from this range could be detrimental to its survival." This statement is correct. S6: "Many of the extrinsic factors such as temperature and light, control plant growth and development via PGR." This indicates PGRs do not operate independently of environmental signals. This statement is incorrect. Therefore, statements S1, S2, S3, and S5 are correct. Final Answer: The final answer is C because S1, S2, S3, and S5 are correct.
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