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In which type of placentation, the ovary is unilocularwith a single ovule?
- a)Axile placentation
- b)Marginal placentation
- c)Free central placentation
- d)Basal placentation
Correct answer is option 'D'. Can you explain this answer?
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In which type of placentation, the ovary is unilocularwith a single ov...
In basalplacentation, the placenta develops at the base of ovary and a single ovule is attached to it,
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In which type of placentation, the ovary is unilocularwith a single ov...
In basal placentation, the ovary is unilocular and a single ovule is borne at the base of ovary.
For example :- Marigold, Sunflower.
For example :- Marigold, Sunflower.
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In which type of placentation, the ovary is unilocularwith a single ov...
Basal placentation is the type of placentation in which the ovary is unilocular with a single ovule. In this type of placentation, the ovule is attached to the base or bottom of the ovary. Let's understand this in more detail.
Explanation:
1. Definition of Placentation:
Placentation refers to the arrangement and attachment of ovules within the ovary. It plays a crucial role in the development of seeds and fruits.
2. Basal Placentation:
- In basal placentation, the ovary is unilocular, meaning it is divided into a single chamber or compartment.
- There is only one ovule present in the ovary, which is attached to the base or bottom of the ovary.
- The ovule is usually erect and attached at the basal part of the ovary.
- Examples of plants with basal placentation include marigold (Tagetes) and sunflower (Helianthus).
3. Other Types of Placentation:
a) Axile Placentation:
- In axile placentation, the ovary is divided into several chambers called locules, which are arranged around a central axis.
- The ovules are attached to the inner walls of the locules.
- Examples of plants with axile placentation include tomato (Solanum lycopersicum) and pea (Pisum sativum).
b) Marginal Placentation:
- In marginal placentation, the ovules are attached along the margin or edge of the ovary.
- The ovary may be unilocular or multilocular.
- Examples of plants with marginal placentation include poppy (Papaver) and primrose (Primula).
c) Free Central Placentation:
- In free central placentation, the ovules are attached to a central column or pillar within a unilocular ovary.
- The ovules are not attached to the walls of the ovary.
- Examples of plants with free central placentation include Dianthus and Malva.
In conclusion, the correct answer is option 'D', which states that basal placentation is the type of placentation where the ovary is unilocular with a single ovule attached to the base or bottom of the ovary.
Explanation:
1. Definition of Placentation:
Placentation refers to the arrangement and attachment of ovules within the ovary. It plays a crucial role in the development of seeds and fruits.
2. Basal Placentation:
- In basal placentation, the ovary is unilocular, meaning it is divided into a single chamber or compartment.
- There is only one ovule present in the ovary, which is attached to the base or bottom of the ovary.
- The ovule is usually erect and attached at the basal part of the ovary.
- Examples of plants with basal placentation include marigold (Tagetes) and sunflower (Helianthus).
3. Other Types of Placentation:
a) Axile Placentation:
- In axile placentation, the ovary is divided into several chambers called locules, which are arranged around a central axis.
- The ovules are attached to the inner walls of the locules.
- Examples of plants with axile placentation include tomato (Solanum lycopersicum) and pea (Pisum sativum).
b) Marginal Placentation:
- In marginal placentation, the ovules are attached along the margin or edge of the ovary.
- The ovary may be unilocular or multilocular.
- Examples of plants with marginal placentation include poppy (Papaver) and primrose (Primula).
c) Free Central Placentation:
- In free central placentation, the ovules are attached to a central column or pillar within a unilocular ovary.
- The ovules are not attached to the walls of the ovary.
- Examples of plants with free central placentation include Dianthus and Malva.
In conclusion, the correct answer is option 'D', which states that basal placentation is the type of placentation where the ovary is unilocular with a single ovule attached to the base or bottom of the ovary.
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In which type of placentation, the ovary is unilocularwith a single ovule?a)Axile placentationb)Marginal placentationc)Free central placentationd)Basal placentationCorrect answer is option 'D'. Can you explain this answer?
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