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NEET UG Unit 8N: Ecosystem Services, Succession & Global Change — practice questions

Explore 61 free Unit 8N: Ecosystem Services, Succession & Global Change questions in NEET UG 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 61.

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 →Trichomes on the stem are usuallyRead the answer and worked solution →Parenchyma, collenchyma and sclerenchyma collectively form theRead the answer and worked solution →Vascular bundles in roots have xylem and phloem arrangedRead the answer and worked solution →In dicot stems, the cambium between xylem and phloem makes the vascular bundleRead the answer and worked solution →Casparian strips are found in theRead the answer and worked solution →Bulliform cells are found inRead the answer and worked solution →

Worked practice questions

Asexual buds called gemmae are formed in

  1. Liverworts inside gemma cups on thalli
  2. Mosses inside the spore capsule mouth
  3. Brown algae inside the holdfast structure
  4. Gymnosperms inside the ovuliferous cone
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Correct answer: A. Liverworts inside gemma cups on thalli

Gemmae are green multicellular asexual buds in receptacles called gemma cups on the thallus of liverworts (Marchantia). On detachment they germinate into new thalli. Mosses use protonemata and budding.

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The protonema is a stage seen in the life cycle of

  1. The sporophyte of liverworts
  2. The gametophyte of mosses
  3. The sporophyte of mosses
  4. The gametophyte of ferns
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Correct answer: B. The gametophyte of mosses

**Moss gametophyte has two stages:** a creeping, filamentous protonema (first stage) and an upright leafy stage (second stage). The leafy stage bears the sex organs.

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Heterospory, the production of two types of spores (microspores and megaspores), is seen in

  1. All algae regardless of class
  2. All liverwort genera without exception
  3. Most homosporous true ferns
  4. Selaginella and Salvinia among pteridophytes
Show answer and solution

Correct answer: D. Selaginella and Salvinia among pteridophytes

Selaginella and Salvinia produce micro- and megaspores. Most ferns are homosporous. Heterospory is regarded as a precursor to the seed habit (the gametophyte is retained on the parent sporophyte).

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