Question:

Heterosporous pteridophytes show certain characteristics, which are precursor to the 'seed habit' in gymnosperms, One of such characteristics is

Updated On: Jun 23, 2023

presence of vascular tissues
external water required for fertilisation
presence of embryo stage
development of embryo inside the female gametophyte

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The Correct Option is D

Solution and Explanation

Genera like Selaginella and Salvinia which produce two kinds of spores, are known as heterosporous. The megaspores and microspores germinate and give rise to female and male gametophytes, respectively. The female gametophytes in these plants are retained on the parent sporophytes for variable periods. The development of the zygotes into young embryos take place within the female gametophytes. This event is the precursor to the seed habit which is considered as an important step in evolution.

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Notes on Kingdom Plant

Concepts Used:

Plant Kingdom

The Plant Kingdom comprises all the plants that have some shared characteristics. These are bacteria (prokaryotes), photosynthetic plants, fungi, and several non-photosynthetic plants.

Read Also: Two Kingdom Classification

Several features of Kingdom Plantae are as follows:

They are stationary. They are static and usually remain in one place only.
They have branches that expanded and green leaves due to the presence of chlorophyll.
They are an autotrophic mode of nutrition that simply means they prepare their food with the help of water, sunlight and carbon dioxide. It is further known as self-nutrition.
They indulge in photosynthesis during the day and therefore more carbon dioxide is needed during the day and at night it is released.
They secure their food in the form of starch-like algae.
They have an inelastic wall around their cell known as a cell wall comprised of cellulose.
There is an absence of the nervous system and excretory system.
Reproduction is entirely dependent on air, insects and water. Asexual and vegetative method of reproduction is noticed or detected.
The non-photosynthetic plants acquire their food through parasitism, i.e through their host like Indian pipe.

Read More: Classification of Plants