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Biology · PLANT KINGDOM

हिन्दी

In mosses, the secondary protonema differs fundamental from the primary protonema in that the secondary protonema:

  1. Is diploid and develops directly from the zygote upon fertilization.
  2. Is a non-photosynthetic underground storage structure bearing unicellular rhizoids.
  3. Develops from structures other than spores and gives rise to leafy shoots as lateral buds.
  4. Produces spores directly through meiotic division without forming sex organs.

Correct answer · Option 3

Develops from structures other than spores and gives rise to leafy shoots as lateral buds.

Explanation

Primary protonema develops directly from a haploid spore. Secondary protonema arises vegetatively from other gametophytic tissue and develops lateral buds that grow into upright leafy gametophytic shoots.
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