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Meghna Thapar 5 years, 7 months ago
The records of population density 2011 of India state that the density 2011 has increased from a figure of 324 to that of 382 per square kilometer. Bihar is the most thickly populated state (1106 persons/sq km.) followed by west bengal-1028 and Kerala 860. Population density increased at the rate of 17.54 from 2001 to 2011. Density of population in India is 382 persons per sq km. Delhi (11,320) turns out to be the most densely inhabited followed by Chandigarh (9,258), among all States/UTs, both in 2001 and 2011 Census.
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Yogita Ingle 6 years, 3 months ago
A floral formula is a system of representing the structure of a flower using specific letters, numbers and symbols. It represents floral symmetry, number of parts, connation and adnation, insertion, and ovary position. Floral formulas are useful tools for remembering characteristics of the various angiosperm families. Their construction requires careful observation of individual flowers and of variation among the flowers of the same or different individuals.
A floral formula consists of five symbols indicating from left to right:
- Floral Symmetry
- Number of Sepals
- Number of Petals
- Number of Stamens
- Number of Carpels
The following symbols are used in floral formulae:
Some important points to be remembered while writing floral formulae:
- Fusion is indicated by enclosing the figure in brackets.
- Adhesion is indicated by drawing a line above the symbols of the floral parts.
- The position of the mother axis with respect to the flower is represented by drawing a dot on the top of the floral diagram.
Floral formulae of some important families of flowering plants:
Family Fabaceae:
Family Solanaceae
Family
Liliaceae
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Yogita Ingle 6 years, 3 months ago
Morphology
- Earthworms have long cylindrical body divided into 100-120 similar short segments known as metameres .
- The dorsal surface of the body is marked by a dark median mid dorsal line along the longitudinal axis of the body and the ventral surface is distinguished by the presence of genital openings.
- Anterior end consists of the mouth and the prostomium, covering the mouth.
- The first body segment is called the peristomium, which contains the mouth.
- In a mature worm, segments 14-16 are covered by a prominent dark band of glandular tissue called clitellum, thus dividing the body into preclitellar, clitellar and postclitellar segments.
- Four pairs of spermathecal apertures and a pair of male genital pores are situated on the 5th -9th segments and 18th segment, respectively.
- A single female genital pore is present in the mid-ventral line of 14th segment.
- Numerous minute pores called nephridiopores open on the surface of the body.
- Except the first, last and clitellum, there are rows of S-shaped setae in each segment, help in locomotion.
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