Find the best tutors and institutes for Class 12 Tuition
Q16:
What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.
Solution :
Step 1: Botanical Definition and Theoretical Foundation of a Bisexual Flower
In angiosperm morphology, a flower is considered a modified shoot functioning as a reproductive organ. A typical complete flower consists of four concentric whorls situated on the receptacle (thalamus):
- Non-essential (Accessory) Whorls: The Calyx (sepals) and Corolla (petals), which assist in protection and pollinator attraction.
- Essential (Reproductive) Whorls: The Androecium (male reproductive organs) and Gynoecium (female reproductive organs).
A bisexual flower (also referred to botanically as a perfect, hermaphroditic, or monoclinous flower) is defined as a flower that possesses both of the essential reproductive whorls—the androecium (stamens) and the gynoecium (carpels/pistil)—within the same floral structure. [Per the principles of plant embryology, this morphological arrangement allows both microsporogenesis (pollen formation) and megasporogenesis (ovule formation) to occur in close spatial proximity, facilitating both autogamy (self-pollination) and allogamy (cross-pollination)]. The parental sporophytic tissue is diploid ($2n$), and through meiosis, produces haploid ($n$) gametophytes within these same floral boundaries.
Step 2: Anatomical Visualization of a Bisexual Flower
The following structural diagram illustrates a longitudinal section of a typical bisexual flower. Note the simultaneous presence of the stamen (anther + filament) and the pistil (stigma, style + ovary).
Step 3: Identification and Taxonomy of Common Bisexual Flowers
Through systematic biological observation of neighborhood flora, numerous plant species manifest bisexual flowers. The binomial nomenclature strictly follows the International Code of Nomenclature for algae, fungi, and plants (ICN). Below is a precise taxonomic classification of five representative local bisexual flowers:
| Common Name | Scientific Name | Taxonomic Family | Morphological Evidence (Bisexuality) |
|---|---|---|---|
| China Rose / Hibiscus | Hibiscus rosa-sinensis | Malvaceae | Characterized by a prominent central staminal tube (monadelphous stamens) through which the style passes, terminating in a 5-lobed stigma. |
| Garden Pea | Pisum sativum | Fabaceae | Papilionaceous corolla encloses diadelphous stamens ($9 + 1$ arrangement) and a single monocarpellary superior ovary. |
| Mustard | Brassica campestris | Brassicaceae | Exhibits tetradynamous stamens (4 long inner, 2 short outer) surrounding a bicarpellary, syncarpous central pistil. |
| Rose | Rosa indica (var.) | Rosaceae | Displays multiple, unfused stamens (polyandrous condition) and numerous free carpels (apocarpous condition) on a cup-like hypanthium. |
| Lily | Lilium candidum | Liliaceae | Features 6 prominent stamens in two whorls ($3 + 3$) surrounding a single, robust tricarpellary pistil. |
Final Solution: A bisexual (perfect) flower is an anatomical structure containing both male (androecium/stamens) and female (gynoecium/pistil) reproductive whorls within the same flower. Five common neighbourhood examples, accompanied by their scientific names, are China Rose (Hibiscus rosa-sinensis), Garden Pea (Pisum sativum), Mustard (Brassica campestris), Rose (Rosa indica), and Lily (Lilium candidum).
More Questions from Class 12 Biology Reproduction in Organisms EXERCISES
- Q1: Why is reproduction essential for organisms?
- Q1: Why is reproduction essential for organisms?
- Q2: Which is a better mode of reproduction: sexual or asexual? Why?
- Q2: Which is a better mode of reproduction: sexual or asexual? Why?
- Q3: Why is the offspring formed by asexual reproduction referred to as clone?
- Q3: Why is the offspring formed by asexual reproduction referred to as clone?
- Q4: Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?
- Q4: Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?
- Q5: How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?
- Q5: How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?
- Q6: Distinguish between asexual and sexual reproduction. Why is vegetative reproduction also considered as a type of asexual reproduction?
- Q6: Distinguish between asexual and sexual reproduction. Why is vegetative reproduction also considered as a type of asexual reproduction?
- Q7: What is vegetative propagation? Give two suitable examples.
- Q7: What is vegetative propagation? Give two suitable examples.
- Q8(a): Define (a) Juvenile phase,
- Q8(a): Define (a) Juvenile phase,
- Q8(b): Define (b) Reproductive phase,
- Q8(b): Define (b) Reproductive phase,
- Q8(c): Define (c) Senescent phase.
- Q8(c): Define (c) Senescent phase.
- Q9: Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
- Q9: Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
- Q10: Explain why meiosis and gametogenesis are always interlinked?
- Q10: Explain why meiosis and gametogenesis are always interlinked?
- Q11(a): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (a) Ovary ———————————
- Q11(a): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (a) Ovary ———————————
- Q11(b): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (b) Anther ———————————
- Q11(b): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (b) Anther ———————————
- Q11(c): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (c) Egg ———————————
- Q11(c): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (c) Egg ———————————
- Q11(d): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (d) Pollen ———————————
- Q11(d): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (d) Pollen ———————————
- Q11(e): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (e) Male gamete ———————————
- Q11(e): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (e) Male gamete ———————————
- Q11(f): Identify each part in a flowering plant and write whether it is haploid (\(n\)) or diploid (\(2n\)). (f) Zygote ———————————
- Q11(f): Identify each part in a flowering plant and write whether it is haploid ((n)) or diploid ((2n)). (f ) Zygote ———————————
- Q12: Define external fertilisation. Mention its disadvantages.
- Q12: Define external fertilisation. Mention its disadvantages.
- Q13: Differentiate between a zoospore and a zygote.
- Q13: Differentiate between a zoospore and a zygote.
- Q14: Differentiate between gametogenesis from embryogenesis.
- Q14: Differentiate between gametogenesis from embryogenesis.
- Q15: Describe the post-fertilisation changes in a flower.
- Q15: Describe the post-fertilisation changes in a flower.
- Q16: What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.
- Q17: Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?
- Q17: Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?
- Q18: Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?
- Q18: Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?
CBSE Solutions for Class 12 Biology Reproduction in Organisms
Chapters in CBSE - Class 12 Biology
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
Top Tutors who teach Reproduction in Organisms
Top Tutor
Tezpur Airpur Area, Tezpur
7 yrs of
Exp
2 students
421 hrs of classes completed
450
per hour
Online Classes
Tutor's home
I am a mathematics teacher. I have been working in schools from last 6-7 years , and i was giving tutions at my home and even in an insitute in delhi from last 5-7 years. I shifted to tezpur,Assam in April 2021. my last job was in air force school hindan and I currently work at Air force school tezpur. i have a degree in msc mathematics and b.ed. i teach mathematics upto class 12. my key skills are in ms office , mathematics project, calligraphy , and can help out students in their various activities.
She is really amazing tutor you can ever have.She guides her students really well.She helps her students everytime. She motivates her students always. She supports her students always. She explains really nicely.
Top Tutor
P847+PC6 Thrissur, Thrissur
17 yrs of
Exp
10 students
501 hrs of classes completed
600
per hour
Online Classes
I believe in conceptual learning and always relate the content to real life situations. I discourage the rote learning and promote the application of the concept in daily life situation.
I have enjoyed madam's classes a lot. Her sessions are very engaging. She has helped me to understand even the difficult concepts easily.
Super Tutor
Panvel, Mumbai
12 yrs of
Exp
21 students
3283 hrs of classes completed
500
per hour
Online Classes
I provide private tuition for Physics and Mathematics for Class XI and XII (All Boards) Physics for Engineering Aspirants Physics for Medical Aspirants Class IX and X Mathematics and Science.
I am grateful that my son have been taught by you. Your dedication, knowledge, and passion for teaching make every class engaging and productive. You explain complex concepts in a simple and understandable manner. Thank you Sir .
Super Tutor
Lalpur, Ranchi
9 yrs of
Exp
8 students
3155 hrs of classes completed
600
per hour
Online Classes
I am a qualified and dedicated teacher, having 10 years of teaching and research experience across different boards including CBSE, ICSE, IGCSE, IB, GCSE, and Australian Board. I specialize in guiding students from Class 8 to Post Graduation, helping them achieve academic excellence with a tailored and engaging teaching approach. I bring in-depth knowledge and expertise to my sessions. Qualifications: • Ph. D (Science) – BIT Mesra, Ranchi • CSIR UGC NET (2011) AIR-14 • ICAR NET (2010) • ICAR NET (2018) • GATE (2009) My student-centered approach focuses on assessing individual learning needs, bridging knowledge gaps, and fostering critical thinking through interactive methods like discussions, visual aids, and hands-on activities. Regular feedback and personalized guidance empower students to excel and develop a lifelong love for learning.
Well explained and great teacher with patience, ensures we understand the concepts clearly. Well organised as well. Thank you for helping
Top Tutor
Krishnarajapura, Bangalore
10 yrs of
Exp
5 students
399 hrs of classes completed
500
per hour
Online Classes
Tutor's home
I am an IITian. Passed out from IIT Delhi. Teaching is my passion. I have seven years of teaching experience teach chemistry, Biology ,Biochemistry, Biotechnology for class 11 and 12 from different boards.I teach chemistry for entrance exams like NEET, JEE.
Anasuya mam teaches each topic in detail and giving excellent support in JEE chemistry preparations.
