Plant Physiology – Transport in Plants Quiz - ICSE Class 11 Biology

Free practice quiz: Plant Physiology – Transport in Plants (ICSE Class 11 Biology). 36 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 11 Biology practice quiz has 36 multiple-choice questions on Plant Physiology – Transport in Plants, and 36 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. The opening and closing of stomata are primarily regulated by the movement of which ion?

   1. Sodium (Na+)
   2. Potassium (K+)
   3. Calcium (Ca2+)
   4. Magnesium (Mg2+)
   Show answer

   Answer: B. Potassium (K+)

   The influx of potassium ions into guard cells leads to an increase in turgor pressure, causing stomatal opening. Efflux of potassium ions leads to a decrease in turgor pressure and stomatal closure.

2. The movement of water into root hairs is primarily driven by:

   1. Active transport of water molecules
   2. Bulk flow due to wind action
   3. A difference in water potential between the soil solution and the root hair cytoplasm
   4. Evaporation from the root surface
   Show answer

   Answer: C. A difference in water potential between the soil solution and the root hair cytoplasm

   Water moves from an area of higher water potential (usually the soil) to an area of lower water potential (the root hair cytoplasm, which has a more negative water potential due to dissolved solutes). This movement is passive, driven by osmosis.

3. Which of the following conditions would MOST likely lead to reduced transpiration?

   1. High humidity, low temperature
   2. Low humidity, high wind
   3. High temperature, low humidity
   4. High light intensity, low CO2
   Show answer

   Answer: A. High humidity, low temperature

   High humidity reduces the water potential gradient between the leaf interior and the atmosphere, slowing down evaporation. Low temperatures also generally reduce the rate of evaporation. Conversely, low humidity, high wind, and high temperature all increase the rate of transpiration.

4. Root pressure is most significant in plants under conditions of:

   1. High transpiration and low humidity
   2. Low transpiration and high humidity
   3. High wind speed and high temperature
   4. Low soil water potential
   Show answer

   Answer: B. Low transpiration and high humidity

   When transpiration is low, water absorption by roots can continue, building up positive hydrostatic pressure in the xylem, known as root pressure. This is more pronounced when the atmosphere is humid, reducing the transpiration pull.

5. Which of the following factors is LEAST likely to affect the rate of transpiration?

   1. Wind speed
   2. Light intensity
   3. Soil pH
   4. Atmospheric humidity
   Show answer

   Answer: C. Soil pH

   Soil pH primarily affects nutrient availability and absorption. While severe nutrient deficiency can indirectly impact plant health and transpiration, soil pH itself does not directly influence the physical process of water evaporation from leaves. Wind speed, light intensity, and humidity directly affect the rate of transpiration.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Guttation, the loss of water in the form of droplets from the margins of leaves, is most likely to occur under which condition?
2. The pressure potential in a plant cell is also known as:
3. Which of the following statements accurately describes the cohesion-tension theory of water transport in xylem?
4. The 'source' in phloem transport refers to:
5. The process by which sugars are loaded into the phloem sieve tube elements is called:
6. The 'sink' in phloem transport refers to:
7. Which component of water potential is responsible for the osmotic movement of water across a semipermeable membrane?
8. The movement of mineral ions from the soil into the root hairs often occurs against their concentration gradient. This process requires:
9. When a plant cell is placed in a hypertonic solution, what happens to its protoplast?
10. Water movement from a leaf cell into the intercellular air spaces within the leaf is primarily driven by:
11. What is the primary driving force for the upward movement of water in the xylem of tall trees, as described by the cohesion-tension theory?
12. The selectivity of mineral ion uptake by root cells is primarily due to:
13. Water potential (Ψw) is defined as:
14. Which of the following is a characteristic of the symplastic pathway for water movement in plants?
15. Leaf abscission (dropping of leaves) is often associated with:
16. Which of the following is the primary site of water absorption in most plants?
17. The movement of sugars from mesophyll cells to sieve tube elements involves:
18. An increase in the concentration of abscisic acid (ABA) in guard cells typically leads to:
19. The movement of water into the xylem from the surrounding parenchyma cells is driven by:
20. When a plant is experiencing water stress (drought), the production of which hormone is generally increased, leading to stomatal closure?
21. Which of the following best describes the role of companion cells in phloem transport?
22. The movement of water across the root endodermis is often predominantly through the symplastic pathway because:
23. Which of the following is a property of water that is crucial for its upward transport in plants via the cohesion-tension theory?
24. When sugars are loaded into the phloem at a source, the solute potential (Ψs) of the sieve tube elements:
25. The process by which water moves from a region of higher water potential to a region of lower water potential across a selectively permeable membrane is known as:
26. Water molecules are pulled up the xylem due to transpiration. The force that pulls the water column is:
27. Phloem unloading in storage sinks (like potato tubers) is often characterized by:
28. The rate of water movement through the stomatal pore is directly influenced by:
29. During the day, under normal conditions, the stomata of most plants are:
30. In phloem transport, sucrose is typically moved from source to sink. Which of the following is generally considered a primary source in a photosynthesizing plant?
31. The movement of water through the xylem is considered a passive process because it is driven by:

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