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AP Intermediate 1st Year Plant Growth and Development — practice questions

Explore 50 free Plant Growth and Development questions in AP Intermediate 1st Year Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Plant Growth and Development questions and exercises with answers

Showing questions 1–30 of 50.

Apical meristems are responsible forRead the answer and worked solution →The typical growth curve of a plant or organ isRead the answer and worked solution →Which is the most reliable measure of plant growth?Read the answer and worked solution →Differentiation in plants refers toRead the answer and worked solution →Dedifferentiation is best illustrated byRead the answer and worked solution →Heterophylly in coriander or aquatic buttercup demonstratesRead the answer and worked solution →Auxin is produced primarily atRead the answer and worked solution →Gibberellins are best known for inducingRead the answer and worked solution →In tissue culture, a HIGH auxin to LOW cytokinin ratio in the medium favoursRead the answer and worked solution →Ethylene is unique among plant hormones because it isRead the answer and worked solution →Wheat is a long-day plant, which means it flowers whenRead the answer and worked solution →Vernalisation refers toRead the answer and worked solution →NEET · Biology · Photoperiodism ↔ PlantRead the answer and worked solution →NEET · Biology · Plant Hormone ↔ FunctionRead the answer and worked solution →A leaf unfolds and expands. Is this growth?Read the answer and worked solution →Plants can keep growing all their lives because they have:Read the answer and worked solution →A tree trunk gets thicker every year. This increase in girth is:Read the answer and worked solution →At the cell level, growth is mainly an increase in the amount of:Read the answer and worked solution →One maize root tip can make more than ___ new cells per hour.Read the answer and worked solution →The three phases of growth are meristematic, elongation and:Read the answer and worked solution →A cell forming a tracheary element loses its protoplasm. This maturing for a job is:Read the answer and worked solution →Mature parenchyma cells start dividing again to form cork cambium. This is:Read the answer and worked solution →Auxins, gibberellins and cytokinins are grouped as plant growth:Read the answer and worked solution →Darwin and his son saw canary grass coleoptiles bend towards light. This response is:Read the answer and worked solution →Kurosawa found rice seedlings grew foolishly tall after fungal filtrate. The substance was:Read the answer and worked solution →Ripe oranges gave off a gas that ripened stored bananas. The gas was:Read the answer and worked solution →A gardener dips stem cuttings in a powder to make roots grow. The powder holds:Read the answer and worked solution →The growing apical bud stops side buds from growing. This is:Read the answer and worked solution →Tea gardeners pinch off shoot tips so that:Read the answer and worked solution →2,4-D kills dicot weeds in a lawn but spares the grass because it does not affect mature:Read the answer and worked solution →

Worked practice questions

Apical meristems are responsible for

  1. increase in girth (secondary growth)
  2. regrowth after grass is grazed
  3. increase in length at root and shoot tips
  4. wound healing in old stems
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Correct answer: C. increase in length at root and shoot tips

Apical meristems sit at the tips of roots and shoots and drive primary growth, lengthening the plant. Lateral meristems (vascular cambium) add girth (secondary growth). Intercalary meristems handle regrowth in grasses after grazing or cutting.

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The typical growth curve of a plant or organ is

  1. linear throughout life
  2. sigmoid: lag, log, and stationary phases
  3. step-wise, only at night
  4. purely exponential, never plateauing
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Correct answer: B. sigmoid: lag, log, and stationary phases

Most growth in plants follows an S-shaped (sigmoid) curve: a slow lag phase, a rapid logarithmic phase then a stationary plateau when resources or hormones limit further growth. Pure linear or pure exponential growth doesn't account for the final slow-down.

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Which is the most reliable measure of plant growth?

  1. fresh weight, which is easy to record
  2. leaf colour intensity at noon
  3. stem diameter at the base only
  4. dry weight, which excludes water content
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Correct answer: D. dry weight, which excludes water content

Fresh weight varies with how much water the plant has absorbed in the last few hours. Dry weight, measured after oven-drying, reflects actual organic matter accumulated. Length, area, and volume are also used but dry weight is the most reliable.

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More Biology topics

The Living World & Biological ClassificationPhotosynthesis in Higher PlantsAnimal KingdomBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionLocomotion and MovementNeural Control and Chemical Coordination