Standard 10th Science Biology Experiment 3 Study of Hibiscus flower Practical Answer Solutions.
Aim : To study flower of Hibiscus with reference to reproductive structures.
Requirements : Flowers of Hibiscus, forceps, razor or blade, slides, two needles (pointed and arrow headed),cover slips, dissecting microscope, compound microscope, paper, glycerine, etc.
Procedure :
- Take an open flower of Hibiscus and observe the different floral whorls, namely calyx, corolla, androecium and gynoecium.
- Separate out each floral whorl carefully with the help of needles and forceps.
- Arrange the members of each whorl separately on a white paper or a glass slide.
- Count the members of each whorl.
- Observe the separated members under a dissecting microscope.
- Carefully separate stigma from staminal tube by taking longitudinal section.
- Draw diagrams of the members of each whorl.
Diagram : Draw neat and labelled diagram of L.S. of Hibiscus flower.
Observation : Observe different parts of Hibiscus flower and enter your observations in the following table :
| Whorl of flower | Number/Member | Description | Functions |
| Epicalyx | 5 to 8 free bracteoles | Green in colour | To protect inner delicate parts in bud condition |
| Calyx | 5 sepals | Green in colour | Protective, keeping all the parts safely covered during bud condition. |
| Corolla | 5, large petals | Red or different coloured, bright and large petals. | To attract insects for pollination. |
| Androecium | Many stamens | Filaments of stamens are fused to form staminal tube. It bear anthers at its tip. | To produce pollen grains which form male gametes for sexual reproduction. |
| Gynoecium | 5 carpels | Consists of ovary, style and stigma. | To produce ovules which forms female gametes for sexual reproduction. |
Inference : What is the function of a flower ?
Ans. Flower is the structural unit of sexual reproduction in plants. It attracts insect for pollination.
Multiple Choice Questions
Choose the correct alternative and write its letter (A), (B), (C), (D) in the box :
1. The flower of Hibiscus is said to be the complete flower because
(A) it is big in size. (B) it is colourful and thus attracts insects.(C) it has all the four whorls. (D) it does not develop into fruit.
Answer: C
2. Which parts form gynoecium of the flower?
(A) Ovary, style and stigma (B) Ovary, seeds and fruits (C) Staminal tube and stigma (D) Calyx covering the ovary
Answer: A
3. How is androecium of the Hibiscus flower?
(A) Free stamens associated with gynoecium (B) Fused stamens on the petals (C) Stamens inserted into calyx (D) Many stamens, filaments of the stamens fused to form staminal tubef
Answer: D
4. Which part of the flower protects it in the bud condition?
(A) Corolla (B) Stamen (C) Bracts (D) Calyx
Answer: D