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The diagram below depicts the relationship of land plants with some of the major apomorphies indicated.Below is a list of apomorphies that have not be
Question

The diagram below depicts the relationship of land plants with some of the major apomorphies indicated.

Below is a list of apomorphies that have not been labeled on the tree above:

i. Intercalary growth of sporophyte

ii. Oil bodies

iii. Archegonium

iv. Leptoids

which one of the following options correctly matches the apomorphies with their positions on the tree?

A.

A-III, B-II, C-IV, D-I

B.

A-I, B-III, C-II, D-IV

C.

A-I, B-II, C-III, D-IV

D.

A-II, B-I, C-IV, D-III

Correct option is A

Correct Answer: (1) A-iii, B-ii, C-iv, D-i

Explanation:

  • A. Cuticle: The cuticle is a waxy layer that helps prevent water loss in plants, which is a key feature for terrestrial adaptation. This corresponds to apomorphy (iii): Morphological changes that take place with plant development. The cuticle is an important adaptation for plant survival on land, which is why it is linked to morphological development in plants.

  • B. Liverworts: Liverworts are characterized by the presence of oil bodies, which are specialized cells for storing hydrophobic substances like oils. This corresponds to apomorphy (ii): Oil bodies, which are typical of liverworts.

  • C. Mosses: Mosses possess pseudo-elaters, which help in the dispersal of spores. These are unique to mosses and related plants. This corresponds to apomorphy (iv): Organism with both male and female sex organs in the same flower. This matches the reproduction strategy of mosses, where both gametes are produced in the same structure.

  • D. Polysporangiophytes: Polysporangiophytes are advanced plants characterized by intercalary growth of the sporophyte, which allows for a more complex growth form. This corresponds to apomorphy (i): Intercalary growth of sporophyte, which reflects the advanced, branched growth seen in this group.

Information Booster:

  • Cuticle (A): The development of the cuticle allows plants to conserve water, which was crucial for their survival as they adapted to life on land. This trait marked a significant morphological change in plant development.

  • Oil bodies (B): Liverworts are known for having oil bodies, which help with the storage of lipids and other compounds. These oil bodies are characteristic of liverworts and some other non-vascular plants.

  • Pseudo-elaters (C): Mosses produce pseudo-elaters, which help with the dispersal of spores. These cells are distinct from true elaters found in some other plants and assist in spore release during wet conditions.

  • Intercalary growth of sporophyte (D): Polysporangiophytes have the capacity for intercalary growth, which enables the sporophyte to grow in a way that supports more complex structures, including the production of multiple sporangia.

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