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AP Intermediate 1st Year Unit 8N: Ecosystem Services, Succession & Global Change — practice questions

Explore 13 free Unit 8N: Ecosystem Services, Succession & Global Change 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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Unit 8N: Ecosystem Services, Succession & Global Change questions and exercises with answers

Showing questions 1–13 of 13.

Stomata are MORE numerous on which leaf surface in a dicot?Read the answer and worked solution →The endarch protoxylem position is seen inRead the answer and worked solution →The conjuctive tissue in a dicot root liesRead the answer and worked solution →Pericycle in the dicot root gives rise toRead 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 →In a dicot stem cross section, medullary rays areRead the answer and worked solution →Which feature is CHARACTERISTIC of an isobilateral (monocot) leaf?Read the answer and worked solution →Phloem parenchyma is GENERALLY ABSENT inRead the answer and worked solution →Conjoint, open and endarch vascular bundles arranged in a ring are diagnostic ofRead the answer and worked solution →The cuticle is generally ABSENT inRead the answer and worked solution →The cells next to phloem on the inner side of dicot stem endodermis formRead the answer and worked solution →Vasa recta is the structural analog (functional, not anatomical) in PLANTS ofRead 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
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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 endarch protoxylem position is seen in

  1. The stems of dicot flowering plants
  2. The roots of dicot flowering plants
  3. The leaves of monocot grass species
  4. The thalli of brown marine algae
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Correct answer: A. The stems of dicot flowering plants

ENDARCH = protoxylem toward the centre, metaxylem outward; seen in STEMS. EXARCH = protoxylem peripheral; seen in ROOTS. Dicot stems are endarch with bundles in a ring dicot roots are exarch with radial bundles.

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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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