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AP Biology Unit 8N: Ecosystem Services, Succession & Global Change — practice questions

Explore 75 free Unit 8N: Ecosystem Services, Succession & Global Change questions in AP Biology 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 1–30 of 75.

**Auxins** were first isolated from:Read the answer and worked solution →Which hormone is gaseous and promotes **fruit ripening**?Read the answer and worked solution →**Photoperiodism** refers to:Read the answer and worked solution →**Cytokinins** are best known for promoting:Read the answer and worked solution →The **Richmond-Lang effect** describes the action of:Read the answer and worked solution →**Hydroponics** is:Read the answer and worked solution →Asexual buds called gemmae are formed inRead the answer and worked solution →The protonema is a stage seen in the life cycle ofRead the answer and worked solution →Heterospory, the production of two types of spores (microspores and megaspores), is seen inRead the answer and worked solution →Coralloid roots, with associated nitrogen-fixing cyanobacteria, are seen inRead the answer and worked solution →In gymnosperms, the leaves are typically adapted toRead the answer and worked solution →Algin and carrageen are commercial hydrocolloids obtained fromRead the answer and worked solution →Compared to liverworts, the sporophyte of mosses isRead the answer and worked solution →Mosses are ecologically important because theyRead the answer and worked solution →Which feature is NOT characteristic of red algae (Rhodophyceae)?Read the answer and worked solution →Why do bryophytes need water for sexual reproduction?Read the answer and worked solution →Which of the following gymnosperms is the giant redwood, among the tallest tree species on Earth?Read the answer and worked solution →Which statement about algal cell walls is CORRECT?Read the answer and worked solution →Identify the CORRECT match of class, pigment and stored food.Read the answer and worked solution →Which feature is shared by ALL pteridophytes but ABSENT in bryophytes?Read the answer and worked solution →Twisted aestivation is characteristic ofRead the answer and worked solution →Coconut fruit is BEST described as aRead the answer and worked solution →Marginal placentation, with ovules in two rows along the ventral suture, is seen inRead the answer and worked solution →Apocarpous and syncarpous gynoecia differ in thatRead the answer and worked solution →A typical floral formula uses the symbol Br forRead the answer and worked solution →In the seed of castor, the food storing tissue isRead the answer and worked solution →The outermost layer of the primary plant body is theRead the answer and worked solution →Stomata are bordered by a pair of cells calledRead the answer and worked solution →In grasses, the guard cells areRead the answer and worked solution →Root hairs areRead the answer and worked solution →

Worked practice questions

**Auxins** were first isolated from:

  1. Coleoptile tips of oat (Avena sativa)
  2. Pea seeds
  3. Coconut milk
  4. Rice husk
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Correct answer: A. Coleoptile tips of oat (Avena sativa)

F.W. Went (1928) isolated auxin from oat (Avena) coleoptile tips. Indole-3-acetic acid (IAA) is the most common natural auxin. Promotes cell elongation, apical dominance, root initiation.

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Which hormone is gaseous and promotes **fruit ripening**?

  1. Auxin
  2. Cytokinin
  3. Ethylene (the 'ripening hormone')
  4. ABA
Show answer and solution

Correct answer: C. Ethylene (the 'ripening hormone')

Ethylene (C₂H₄) — only gaseous plant hormone. Triggers fruit ripening (especially climacteric fruits like banana, mango, tomato), leaf abscission, flower senescence. Commercial banana ripening uses ethephon (releases ethylene).

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**Photoperiodism** refers to:

  1. Response of plants to gravity
  2. Response of plants to **day length** (light duration) — affecting flowering
  3. Response to soil temperature
  4. Response to water stress
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Correct answer: B. Response of plants to **day length** (light duration) — affecting flowering

**Photoperiodism:** plants flower in response to the relative duration of light and dark (day length). Garner & Allard (1920). **Three classes:** short-day plants (e.g. tobacco), long-day plants (e.g. spinach), day-neutral (e.g. tomato).

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More Biology topics

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