Q12
3 marksShort AnswerSection A

Explain budding in hydra with the help of labelled diagrams only.

How do Organisms Reproduce?
Modes of Reproduction Used by Single Organisms
Official Answer

As the question specifies "with the help of labelled diagrams only", the step-by-step process of budding in Hydra is illustrated below:



GrowthDetachmentStage 1: Parent Hydra (Showing Bud initiation due to repeated cell division at a specific site)Stage 2: Developing Bud (Bud grows larger, develops tiny tentacles and mouth)Stage 3: New Individual (Fully mature bud detaches from parent to become independent)


Key Stages to Draw in the Exam:

  1. Parent Hydra with Bud: Draw a mature Hydra with a small bulge (bud) near its base.
  2. Developing Bud: Draw the bud growing larger with tiny tentacles starting to sprout at its tip.
  3. New Hydra Detaching: Draw the fully formed young Hydra separating from the parent body to live as an independent organism.
budregenerative cellstentaclesdetachesparent bodyindependent

Marking Scheme

  • 11 mark for drawing the initial stage showing the parent Hydra with a small bud.
  • 21 mark for drawing the developing bud with tentacles.
  • 31 mark for drawing the fully mature bud detaching from the parent body.
  • 4Note: All diagrams must be clearly labelled (Parent, Bud, Tentacles, New Individual).

Hint

Draw three sequential diagrams: first showing a small bulge on the parent body, second showing the bulge growing tentacles, and third showing the fully formed young Hydra separating.

Quick Oral Answer

In Hydra, budding occurs when repeated cell division at a specific site creates an outgrowth called a bud. This bud develops tentacles and a mouth, matures, and eventually detaches to become a new independent individual.

Analysis & Explanation

Budding in Hydra is a form of asexual reproduction. It relies on regenerative cells located at a specific site on the parent body. Repeated cell division at this site produces an outgrowth called a bud. This bud gradually develops tentacles and a mouth. Once it is fully mature, it constricts at the base, detaches from the parent body, and becomes a self-sustaining independent organism.

Common Mistakes

  1. 1Forgetting to label the 'tentacles' or the 'bud'.
  2. 2Not showing the final detachment stage where the young Hydra becomes independent.

Interesting Facts

Hydra uses regenerative cells for both healing/regeneration and active reproduction (budding) under favorable conditions.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2015?

This question carries 3 marks in the CBSE Class 10 Science 2015 examination.

Which chapter does this question come from in Science?

This question is from the chapter "How do Organisms Reproduce?" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Modes of Reproduction Used by Single Organisms" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2015 paper?

This is a Short Answer question from Section A in the CBSE Class 10 Science 2015 paper.