In holozoic nutrition, the first essential step for complex organisms is ______

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 05 Jun, 2025 Shift 2)
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  1. egestion
  2. absorption
  3. ingestion
  4. assimilation

Answer (Detailed Solution Below)

Option 3 : ingestion
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RRB NTPC Graduate Level Full Test - 01
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Detailed Solution

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The correct answer is Ingestion.

Key Points

  • Ingestion is the first step in holozoic nutrition, where food is taken into the body for further processng.
  • It involves the intake of solid or liquid food through specialized structures such as the mouth or oral cavity in complex organisms.
  • Ingestion enables organisms to acquire nutrients essential for their survival and growth.
  • Holozoic nutrition is characteristic of most animals, including humans, and consists of multiple stages such as ingestion, digestion, absorption, assimilation, and egestion.
  • This step is critical for initiating the process of converting complex organic substances into simpler, absorbable forms for energy and cellular function.

Additional Information

  • Holozoic Nutrition: A mode of nutrition where organisms ingest solid food, digest it internally, and absorb nutrients.
  • Digestion: The biochemical process that breaks down complex food molecules into simpler substances using enzymes.
  • Absorption: The process where digested nutrients are absorbed into the bloodstream or cells for distribution throughout the body.
  • Assimilation: The utilization of absorbed nutrients by cells to produce energy and build cellular structures.
  • Egestion: The expulsion of undigested food and waste materials from the body after the completion of digestion.

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