Which type of placentation is characterized by ovules developing on the inner peripheral wall of a unilocular ovary, which may become two-chambered due to the formation of a false septum (replum)?
Answer and explanation
Correct answer: A. Parietal placentation
- Step 1: In parietal placentation, the ovules develop along the inner wall or peripheral part of the ovary.
- Step 2: The ovary is initially unilocular, but in the Brassicaceae family (mustard) and Argemone, it becomes bilocular due to the development of a false septum called the replum.
Answer
Parietal placentation (e.g., mustard and Argemone)
Why not the others: 'Axile placentation...' features ovules attached to a central axis in a multilocular ovary with true septa; 'Marginal placentation...' features ovules borne along the ventral suture of a monocarpellary ovary; 'Free-central placentation...' features ovules on a central column in a unilocular ovary lacking septa.
Practise more Morphology and Anatomy of Flowering Plants.
Free questions with an explanation for every one, and full timed NEET UG mock tests.
More Morphology and Anatomy of Flowering Plants questions
- Which plant species produces specialized respiratory roots (pneumatophores) that grow vertically upward with negative geotropism to obtain o…
- In which plants are the axillary buds modified into woody, straight, pointed thorns that protect the plant against browsing herbivores?
- Which xerophytic adaptation is characterized by a green, flattened, succulent stem that carries out photosynthesis while leaves are reduced…
- What type of phyllotaxy is observed when a single leaf arises at each node in an alternating fashion, as seen in China rose, mustard, and su…
- Which type of inflorescence is characterized by an indeterminate main floral axis that continues to grow while producing flowers laterally i…
- Which of the following flowers displays zygomorphic (bilateral) floral symmetry, meaning it can be divided into two similar halves in only o…