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NEET UG Unit 2A: Ecosystem Services, Succession and Biodiversity — practice questions

Explore 61 free Unit 2A: Ecosystem Services, Succession and Biodiversity questions in NEET UG Environmental Science. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 2A: Ecosystem Services, Succession and Biodiversity questions and exercises with answers

Showing questions 1–30 of 61.

Twisted aestivation is characteristic ofRead the answer and worked solution →Compared to liverworts, the sporophyte of mosses isRead the answer and worked solution →Which option correctly matches symmetry in echinoderms at different life stages?Read the answer and worked solution →Which of the following is mentioned as an exception among sponges because it exhibits radial symmetry?Read the answer and worked solution →According to the content provided, animals from Aschelminthes up to Chordata generally show which level of organisation?Read the answer and worked solution →Which pair of phyla is correctly matched with tissue level of organisation?Read the answer and worked solution →In the basis of animal classification, members of Porifera show which level of organisation?Read the answer and worked solution →The true coelom in many animals is formed by splitting of the mesoderm. This type of coelom formation is called:Read the answer and worked solution →Coelom is best defined as:Read the answer and worked solution →At which embryonic stage are the primary germ layers first clearly established in animals?Read the answer and worked solution →Which feature is NOT characteristic of red algae (Rhodophyceae)?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 →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 →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 →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 →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 →Parenchyma, collenchyma and sclerenchyma collectively form theRead the answer and worked solution →Bulliform cells are found inRead the answer and worked solution →

Worked practice questions

Twisted aestivation is characteristic of

  1. Pea with vexillary arrangement
  2. Calotropis with sepals just touching
  3. China rose with overlapping margins
  4. Cassia with random overlap orientation
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Correct answer: C. China rose with overlapping margins

**Twisted:** one margin of each appendage overlaps the next in a consistent direction (china rose, cotton, lady's finger). **Valvate:** just touching (Calotropis). **Imbricate:** irregular overlap (Cassia, gulmohur). Vexillary: pea, bean.

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Compared to liverworts, the sporophyte of mosses is

  1. Less elaborate with no foot or seta
  2. More elaborate with foot, seta and capsule
  3. Identical with no real structural difference
  4. Absent and replaced by gametophyte tissue
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Correct answer: B. More elaborate with foot, seta and capsule

Both moss and liverwort sporophytes have foot, seta and capsule, but the moss sporophyte is more elaborate and has a more elaborate mechanism of spore dispersal.

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Which option correctly matches symmetry in echinoderms at different life stages?

  1. Adult bilateral, larva radial
  2. Adult asymmetrical, larva bilateral
  3. Adult radial, larva bilateral
  4. Adult radial, larva asymmetrical
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Correct answer: C. Adult radial, larva bilateral

The principle is that echinoderms are an exception across life stages: adults are radially symmetrical, whereas larvae are bilaterally symmetrical. This is important because symmetry here changes with development. Option A reverses the stages. Options B and D are incorrect because neither adult nor larval echinoderms are typically described as asymmetrical in this context.

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More Environmental Science topics

Unit 1A: Biomes, Primary Productivity and Trophic LevelsUnit 7A: Genetic Diversity and Mendelian Transmission in PopulationsUnit 3A: Population Growth, Carrying Capacity and Reproductive StrategiesUnit 6A: Toxicology, Infectious Diseases and Environmental HazardsUnit 5A: Cellular Transport, Osmoregulation and Membrane Biology