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Sia ? 4 years, 7 months ago
Taxon :
- Taxon represents to a group of organisms.
- It is only of one type.
Category :
- Category refers to rank or status of taxon.
- Category is of two types :
(a) Major ranks : Kingdom, Divison and Class etc.
(b) Minor ranks : Genus and species etc.
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Meghna Thapar 5 years, 4 months ago
The floral axis is the area of the flower upon which the reproductive organs and other ancillary organs are attached. It is also the point at the center of a floral diagram. Many flowers in division Angiosperma appear on floral axes. The floral axis can differ in form depending on the type of plant. Floral diagram is a graphic representation of flower structure. It shows the number of floral organs, their arrangement and fusion. Different parts of the flower are represented by their respective symbols. Floral diagrams are useful for flower identification or can help in understanding angiosperm evolution.
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Yogita Ingle 7 years, 4 months ago
1. In basidomycetes, asexual spores are absent while in deutromycetes, asexual spores known as conidia is the only form of reproduction.
2. In basidomycetes, sexual reproduction takes pace by the formation of basidiospores while in deutromycetes, sexual reproduction is not known.
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Yogita Ingle 7 years, 4 months ago
(1) Primary wall : A young plant cell forms a single layer of wall material. This layer is known as the primary cell wall. The primary wall is thin, elastic and capable of expansion in a growing cell. It grows by intussusception. Meristematic and parenchymatous cells have primary cell wall only. The cells of leaves and fruits too have only primary wall. It has more hemicellulose and less cellulose.
(2) Secondary wall : In mature cell, more layers of wall material are added internal to the primary wall. These are called the secondary cell wall. Growth by addition of new wall material on the primary wall is called accretion. It has more cellulose and less hemicellulose. The secondary wall is thick and rigid. It usually consists of three layers, which are often named S1, S2 and S3. It is found in collenchyma and sclerenchyma cells, xylem vesseles.
(3) Tertiary wall : Sometimes tertiary wall is laid down on secondary wall, e.g., tracheids of gymnosperms. It is composed of cellulose and xylan.
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Meghna Thapar 5 years, 4 months ago
The bacteria is known to have the most extensive metabolic diversity because it is able to extract energy from any carbohydrate which is in its reduced form like sugar. It does that as it has different compounds which have different inorganic or organic reduced electron compounds. Metabolic diversity mainly refers to the different metabolic strategies that organisms have evolved to obtain energy. ... An interesting property of some microorganisms is their metabolic versatility, which enables them to select their metabolic mode according to environmental conditions.
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