NEET Biology: Conditions of growth Practice Questions
13 free multiple-choice questions on Conditions of growth (Plant Growth and Development) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. The turgidity of a plant cell is primarily maintained by which process involving the movement of water?
Show answer & explanation
Correct answer: D — Osmosis
Turgidity is maintained when water moves into the cell across a selectively permeable membrane, which is the definition of osmosis.
Q2. Deficiency in which nutrient leads to stunted growth and yellowing of leaves (chlorosis) in plants?
Show answer & explanation
Correct answer: B — Nitrogen
Nitrogen deficiency is a common cause of poor growth and yellowing (chlorosis) because nitrogen is vital for building proteins and chlorophyll.
Q3. Etiolation is the excessive growth of plants in the absence of sufficient light. This condition occurs because the plant is trying to reach:
Show answer & explanation
Correct answer: D — Light
Etiolation is the stretching of stems in the absence of light, where the plant attempts to grow towards the light source.
Q4. Which nutrient is essential for the formation of chlorophyll and is primarily involved in photosynthesis?
Show answer & explanation
Correct answer: D — Nitrogen
Nitrogen is a crucial component of the amino acids and chlorophyll molecules, making it essential for the synthesis of chlorophyll and overall growth.
Q5. The process by which plants regulate their flowering time in response to day length is known as:
Show answer & explanation
Correct answer: C — Photoperiodism
Photoperiodism is the physiological response of plants to the duration of light and darkness, which controls flowering.
Q6. Which factor primarily determines the rate of photosynthesis in plants under ideal conditions?
Show answer & explanation
Correct answer: A — Atmospheric CO₂ concentration
Under ideal conditions (light and temperature permitting), the concentration of atmospheric carbon dioxide (CO₂) is the most direct limiting factor for the rate of photosynthesis.
Q7. Which gaseous factor is essential for the synthesis of food (glucose) during photosynthesis?
Show answer & explanation
Correct answer: C — Carbon Dioxide (CO₂)
Carbon dioxide (CO₂) is the primary raw material fixed by plants during the light-dependent and light-independent reactions to synthesize glucose.
Q8. Which plant hormone is primarily responsible for promoting cell elongation and phototropism in plants?
Show answer & explanation
Correct answer: D — Auxin
Auxin is the primary growth hormone in plants, regulating cell elongation and guiding growth responses like phototropism.
Q9. The process by which plants grow towards a source of light is called:
Show answer & explanation
Correct answer: C — Phototropism
Phototropism is the directional growth movement of a plant in response to a light stimulus (bending towards light).
Q10. The bending of a shoot towards a light source is known as:
Show answer & explanation
Correct answer: B — Phototropism
Phototropism is the directional growth in response to light. This is the classic example of growth response to light direction.
Q11. Which condition is essential for the optimal growth and development of a plant?
Show answer & explanation
Correct answer: D — Optimal temperature, adequate water, and proper nutrients
Optimal growth requires the proper balance of all necessary conditions, including appropriate temperature, sufficient water, and adequate mineral nutrients.
Q12. Which of the following is the primary source of energy for the growth of plants?
Show answer & explanation
Correct answer: B — Sunlight
Sunlight provides the energy necessary for photosynthesis, which is the foundation for all plant growth and development.
Q13. The availability of water to the plant is crucial for which specific aspect of plant development?
Show answer & explanation
Correct answer: A — Cell expansion and turgor
Water is essential for cell expansion, as changes in cell volume and turgor pressure directly dictate the growth and development processes of the plant.
Keep going — practice on Padhai Karlo
Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.
Get the free Android app →