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AP Intermediate 1st Year Environmental Science — practice by topic

Browse 35 questions across 3 Environmental Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Environmental Science topics

Unit 2A: Ecosystem Services, Succession and Biodiversity (13)Unit 5A: Cellular Transport, Osmoregulation and Membrane Biology (12)Unit 6A: Toxicology, Infectious Diseases and Environmental Hazards (10)

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Stomata are MORE numerous on which leaf surface in a dicot?Read the answer and worked solution →The conjuctive tissue in a dicot root liesRead the answer and worked solution →All tissues inside the endodermis of a root collectively form theRead the answer and worked solution →Sclerenchymatous bundle sheaths surround vascular bundles inRead the answer and worked solution →

Worked practice questions

Stomata are MORE numerous on which leaf surface in a dicot?

  1. Adaxial (upper) surface of leaf
  2. Both surfaces in equal numbers
  3. Petiole and not lamina at all
  4. Abaxial (lower) surface of leaf
Show answer and solution

Correct answer: D. Abaxial (lower) surface of leaf

Dicot (dorsiventral) leaves bear most stomata on the abaxial (lower) surface the adaxial surface may have few or none. Monocot (isobilateral) leaves bear stomata on both surfaces equally.

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The conjuctive tissue in a dicot root lies

  1. Between epidermis and hypodermis
  2. Between bundle sheath and mesophyll
  3. Between xylem and phloem patches
  4. Between cortex and endodermis layer
Show answer and solution

Correct answer: C. Between xylem and phloem patches

In a dicot root, parenchymatous cells between alternating xylem and phloem patches are called conjuctive tissue. Later, the cambium ring forms within this zone, initiating secondary growth.

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All tissues inside the endodermis of a root collectively form the

  1. Stele containing pericycle and bundles
  2. Cortex with parenchymatous cells
  3. Epiblema with root hair cells
  4. Casparian zone of suberin
Show answer and solution

Correct answer: A. Stele containing pericycle and bundles

Stele = everything inside the endodermis: pericycle + vascular bundles + pith (if present) + conjuctive tissue. Cortex sits outside the endodermis. Epiblema is the root epidermis.

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How to practise

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  2. Open the question to check the correct answer and read its worked solution.
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