Question

Examples of tenuinucellate and crassinucellate

Answer 1

The body of the ovule consists of a mass of parenchymatous cells named nucellus. It is equivalent to mega sporangium. Nucellus is the central part in ovule in which embryo sac develops.
Nucellus may be quite massive (crassinucellate ovule) or thin (tenuinucellate ovule). It is surrounded by one (unitegmic ovule, e.g., higher dicots) or two (bitegmic ovule, e.g., monocots and primitive dicots) multicellular integuments. Rarely an ovule may be surrounded by three integuments (tritegmic, e.g., Asphodelus) or the integuments are absent (ategmic, e.g., Santalum). Free surfaces of nucellus and integuments are covered by cuticle.

Answer 2

Examples of tenuinucellate and crassinucellate:

• These are the types of ovule in different organisms.
• A parenchymatous cell is present inside the nucleus of the ovum.
• This cell is known as the nucellus.
• While development this nucellus results in the formation of the embryo sac.
• The nucellus may have thin layer of a wall for protection of the inner structure. This is known as tenuinucellate.
• Of the wall surrounding the nucellus is very hard and rigid, it is known as the crassinucellate.

To know:

Difference between tenuinucellate and crassinucellate ovule

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What are tenuinucellate and crassinucellate?

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