Plant Physiology Quiz - CBSE Class 11 Science

Free practice quiz: Plant Physiology (CBSE Class 11 Science). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a primary function of the root system?

   1. Absorption of water and minerals
   2. Anchorage of the plant
   3. Photosynthesis
   4. Storage of food
   Show answer

   Answer: C. Photosynthesis

   Photosynthesis is primarily carried out by leaves, not roots. Roots are responsible for absorption, anchorage, and sometimes storage.

2. What is the primary pigment involved in photosynthesis?

   1. Chlorophyll a
   2. Chlorophyll b
   3. Carotene
   4. Xanthophyll
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   Answer: A. Chlorophyll a

   Chlorophyll a is the primary pigment that absorbs light energy for photosynthesis. Chlorophylls b, carotene, and xanthophyll are accessory pigments.

3. What are the factors affecting the rate of transpiration?

   1. Temperature and humidity only
   2. Light intensity only
   3. Humidity and wind speed only
   4. Temperature, humidity, light intensity, and wind speed
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   Answer: D. Temperature, humidity, light intensity, and wind speed

   All these factors influence the rate of transpiration. Higher temperature, light intensity and wind speed increase transpiration while higher humidity reduces it.

4. What is the role of potassium ions (K+) in stomatal regulation?

   1. Potassium ions have no role in stomatal regulation
   2. Potassium ions increase turgor pressure in guard cells, causing opening
   3. Potassium ions decrease turgor pressure in guard cells, causing opening
   4. Potassium ions have an indirect role via other ions
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   Answer: B. Potassium ions increase turgor pressure in guard cells, causing opening

   Influx of potassium ions into guard cells increases their turgor pressure, leading to stomatal opening.

5. Discuss the different types of plant movements and their mechanisms.

   1. Only nastic movements exist
   2. Only tropic movements exist
   3. Nastic and tropic movements exist, driven by different stimuli
   4. Plants don't show any movement
   Show answer

   Answer: C. Nastic and tropic movements exist, driven by different stimuli

   Plants exhibit both nastic (non-directional) and tropic (directional) movements in response to various stimuli.

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