In biology, placentation refers to the formation, type and structure, or arrangement of the placenta. The function of placentation is to transfer nutrients, respiratory gases, and water from maternal tissue to a growing embryo, and in some instances to remove waste from the embryo.
What is placentation Class 11?
Placentation is defined as the arrangement of the placenta in the ovary of a flower. The placenta connects the ovules with the wall of the ovary. The types of Placentation are- 1.
What is placentation in biology?
The placentation, or arrangement of ovules within the ovary, is frequently of taxonomic value. Placentation is usually submarginal in a simple pistil (female sex organ). In a compound pistil, two or more carpels are used in various ways, placentation being parietal, with carpels united by their… In angiosperm: Seeds.
What is placentation and types of placentation?
Placentation is the arrangement of ovules in the ovary of a plant. The given diagram shows the types of placentation such as basal, apical, parietal, marginal, axial, and free central.
What are four types of placentation?
Describe the various types of placentations found in flowering plants.
(1) Marginal placentation.(2) Axile placentation.(3) Parietal placentation.(4) Basal placentation.(5) Free central placentation.
What is the example of Axile placentation?
In marigold of asteraceae the ovary is superior, 2 or 3 locular, placentation is axile,ovules 1 to many per locule, style 1, stigma 2 or 3 lobed.
What is placenta class 10th?
Answer: Placenta is a special tissue connection between embryo and uterine wall. It acts as an endocrine gland. Role of placenta: It possesses villi that increase the surface area for absorption of nutrients.
What is marginal placentation Class 12?
The arrangement of placenta and ovules within the ovary is called placentation. There are different kinds of placentation namely, marginal, parietal, axile, free central, basal and superficial placentation. In marginal placentation, placenta bearing ovules develop along the junction of the two margins of the carpel.
What is placentation Class 9?
Placentation is defined as the arrangement of the placenta or placentae in the ovary of a flower. Six type of placentation were observed in plants. They are. 1. Marginal- The ovules develop in rows near the margin on the placenta e.g., Leguminosae.
What are two types of inflorescence?
As defined by a botanical dictionary, an inflorescence is a cluster of flowers arranged along a floral axis. Inflorescences come in two types: Racemose and Cymose.
What is the difference between inflorescence and placentation?
Explanation: An inflorescence is categorized on the basis of the arrangement of flowers on a main axis (peduncle) and by the timing of its flowering (determinate and indeterminate). Placentation is the arrangements of ovules within the ovary.
Where is placenta located in a flower?
The placenta is usually located in a region corresponding somewhat to the margins of a leaf but is actually submarginal in position. The placentation, or arrangement of ovules within the ovary, is frequently of taxonomic value. Placentation is usually submarginal in a simple pistil (female sex organ).
What are the three layers of the placenta?
Amniotic layer is composed of a single-celled epithelial layer and a deeper mesodermal layer. Chorionic layer is composed of a mesodermal layer and a trophoblast layer.
What is inflorescence Class 11?
A flower is a modified shoot wherein the shoot apical meristem changes to floral meristem. The arrangement of flowers on thefloral axis is termed as inflorescence.
What are the five types of placentation?
There are five types of placentation that occurs in flowering plants i.e. axile, marginal, parietal, basal, superficial placentation.
Which placentation is in lemon?
Axile type of placentation is seen in lemon and tomato. In this type of placentation, the ovary is partitioned into two or more chambers by septa.
What type of placentation is banana?
Gynoecium. Ovary inferior, tricarpellary, syncarpous, trilocular, numerous ovules on axile placentation. The style is simple and filiform. The stigma is three lobed.
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