Hi. Please answer these questions : Main focus : Hibiscus flower.

Question : Give a comprehensive note on the given topic.

1. Give a brief summary containing information about the Hibiscus flower. ( e. g it's scientific name , where its found , its color e. t.c.)

2. What type of Placentation is found in Hibiscus flower. ?

3. What type of Ovary is found in Hibiscus flower ?( is it a superior, inferior or half Inferior ovary?)

4. What type of Flower is it ? (is it a complete or regular or perfect flower e. t.c.)

5. Adaptive features of the flower.

6. Regions where it is mainly found.

7. What type of pollination does it undergo ?

8.Any other information you think I might need.

Hibiscus Flower is mostly referred commonly as roselle. It is found in warm and tropical region of all over the world. Hibiscus grows on well-drained soils in the sunny areas. This plant is best known by its beautiful and showy flowers thus it is mostly used as ornamental plant but it is also used as human diet, natural dyes and also for various diseases in eastern regions. There are over 200 species of hibiscus flower, cultivated varieties have red, white, yellow, or orange flowers. The leaves are often lobed and may be smooth or covered in trichomes (plant hairs). It belongs to the FAMILY - MALVACEAE(MALLOW or COTTON FAMILY). Hibiscus Flowers also has fibers in their stem thus they are used Robes, Substitute for Jute, Canvas etc.

The arrangement of placenta within the ovary is known as placentation. Ovules are attached to the inner wall of special tissues which are called placenta, the ovules are attached by the small stalk called funicules. There are several type of Placentations i.e. Basal, Marginal, central, axile, parietal.

Placentation in Hibiscus is Axil. In Axil placentation the placentae are located on a central column. Partitions from the central column to the ovary wall create chambers (locules) that separate the placentae and attached ovaries from each other.

Gynoecium is a female whorl of the flower. It is composed of Carpels. Carpel is composed of Sigma, Style and Ovary.

Gynoecium in Hibiscus is Multicarpellary(Five Carpels), Syncarpous(Carpel United), Ovary Superior(Ovary attached above other floral parts) , Multilocular(Cavity of ovary divided into small compartments), One to many ovules in each locules, Style is one and long, Stigma depends on number of carpels. Seed is Non-Endospermic, Fruit is Capsule.

Flower is the reproductive organ of a plant. Morphologically it is very modified shoot. It is developed in the axil of leaf or at a.p.e.x of stem & branch. Flower is also produced in group which is called the inflorescence. If stalk called pedicel is present then flower is called pedicellate, If pedicel is absent Flower is called sessile. If small leaf or scale called bract is present then flower is called bracteate, if absent then called ebracteate.

Flower in Hibiscus is Pedicellate, bracteate, hermaphrodite, complete, actinomorphic(Radially Symmetrical), pentamerous, hypogynous.

They are widely distributed in tropical, sub-tropical, and temperate regions of the world.  The plants are less common in colder regions.

Pollination is the transfer of pollen grains from the male anther of a flower to the female stigma. Pollen grain are male micro-gametophytes of seed plants, and they produce male gametes (sperm cells).

Pollination in hibiscus is by Entomophilous. Entomophilous is the type of pollination by insects. Insects are attracted because of the showy and scented flower and nectar. Nectar is a sugar-rich liquid produced by plants in glands called nectaries. Both Cross-Pollination and Self-Pollination found.

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

the answer is c.mitochondria. glad to .