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PUCET (Punjab) Plant Water Relations — practice questions

Explore 16 free Plant Water Relations questions in PUCET (Punjab) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Plant Water Relations questions and exercises with answers

Showing questions 1–16 of 16.

The form of soil water that is **available** to plants for absorption is:Read the answer and worked solution →**Water potential ($\psi$)** of pure water is:Read the answer and worked solution →**Transpiration** is the loss of water from the plant in the form of:Read the answer and worked solution →**Guttation** is:Read the answer and worked solution →**Stomatal transpiration** accounts for what fraction of total transpiration?Read the answer and worked solution →The translocation of water and minerals **upward** from roots to leaves is called:Read the answer and worked solution →**Macronutrients** (required in large quantities) for plants include:Read the answer and worked solution →**Diffusion Pressure Deficit (DPD)** of a fully turgid plant cell is:Read the answer and worked solution →**Root pressure** can account for ascent of sap up to approximately:Read the answer and worked solution →In a plant cell at flaccid state (TP = 0), the relationship between OP and DPD is:Read the answer and worked solution →When a plant cell is placed in **isotonic** solution:Read the answer and worked solution →The **major channel** for translocation of food (sucrose) in plants is:Read the answer and worked solution →**Aquaporins** are:Read the answer and worked solution →If a plant cell has OP = 12 atm and TP = 4 atm, its **DPD** is:Read the answer and worked solution →Loss of water as **vapour** (transpiration) is highest in which type of tissue/structure on a typical dicot leaf?Read the answer and worked solution →Spot the trait Mendel never usedRead the answer and worked solution →

Worked practice questions

The form of soil water that is **available** to plants for absorption is:

  1. Gravitational water
  2. Hygroscopic water
  3. Capillary water
  4. Combined water
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Correct answer: C. Capillary water

Capillary water (held between soil particles by capillarity) is the form plants can absorb. Gravitational (percolates away), hygroscopic (tightly adsorbed on particles) and combined water (in mineral hydrates) are not available.

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**Water potential ($\psi$)** of pure water is:

  1. Zero (and adding solutes makes it negative)
  2. Always positive
  3. Equal to 1 atm
  4. Cannot be determined
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Correct answer: A. Zero (and adding solutes makes it negative)

Water potential of pure water at STP = 0 by convention. Solutes lower it (more negative). Pressure (turgor) raises it. Water flows from high (less negative) to low (more negative) water potential.

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**Transpiration** is the loss of water from the plant in the form of:

  1. Liquid (through hydathodes)
  2. Vapour, mainly through stomata, cuticle and lenticels
  3. Both A and B equally
  4. Only through roots
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Correct answer: B. Vapour, mainly through stomata, cuticle and lenticels

Transpiration = evaporative water loss (vapour). 90–93% via stomata; 8–10% via cuticle; 0.1–1% via lenticels. Loss as liquid through hydathodes is called guttation (a separate process).

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