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SEXUAL REPRODUCTION IN FLOWERING PLANTS
Study Material
SEXUAL REPRODUCTION IN FLOWERING PLANTS
Very Short Answer Questions
Q1. Name the component cells of the egg apparatus in an embryo sac.
Q2. Name the part of gynoectum that determines the compatible nature of pollen grain.
Q3. Name the common functions that cotyledons and nucellus perform.
Q4. Name the parts of pistil which develop into fruit and seeds.
Q5. In case of ployembryony. If an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?
Q6. Can an unfertilised, apomictic embryo sac give rise to a diploid embryo? If yes, then how?
Q7. Which are the three cells found in a pollen grain when it is shed at the three celled stage ?
Q8. What is self-incompatibility?
Q9. Name the type of pollination in self- incompatible plants.
Q10. Draw the diagram of a mature embryo sac and show its 8-nucleate, 7-celled nature. Show the following parts antipodals, synergids, egg, central cell, polar nuclei.
Q11. Which is the triploid tissue in a fertilized ovule? How is the triploid condition achieved?
Q12. Are pollination and fertilisation necessary in apomixis? Give reasons.
Q13. How is pollination carried out in water plants?
Q14. What is the function of the two male gametes produced by each pollen grain in angiosperms.
Q15. Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
Q16. What is meant by monosporté development of female gametophyte?
Q17. Mention two strategies evolved to prevent self-pollination in flowers.
Q18. Why do you think the zygote is dormant for some time in a fertilized ovule ?
Q19. If one can induce parthenocarpy through the application of growth substances.which fruits would you select to induce parthenocarpy and why?
Q20. What is meant by scutellum? In which type of seeds is it present?
Q21. Define with examples endospermic and non-endospermic seeds.
Q1. List three strategies that a bisexual chasmogamous flower can evolve to prevent self pollination (autogamy).
Q2. Given below are the events that are observed in an artificial hybridization programme Arrange them in the correct sequential order in which they are followed in the hybridization programme.(a) Re-bagging(b) Selection of parents(c) Bagging(d) Dusting
Q3. Discuss the various types of pollen tube entry into ovary with the help of diagrams.
Q4. Differentiate between micro- sporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.
Q5. What is bagging technique? How is it useful in a plant breeding programme?
Q6. What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
Q7. Diffrentiate between(a) Hypocotyl and Epicotyl (b)Coleoptile and Coleorhiza(c) Integument and testa(d) Perisperm and Pericarp
Q8. What is meant by emasculation? When and why does a plant breeder employ this technique?
Q9. What is apomixis? What is its Importance?
Q10. Write briefly about the different types of ovules.
Q1. Starting with the zygote, draw the diagrams of the different stages of embryo development in a dicot.
Q2. What are the possible types of pollinations in chasmogamous flowers? Give reasons.
Q3. With a neat, labeled diagram. describe the parts of a mature angiosperm embryo sac. Mention the role of synergids.
Q4. Draw the diagram of a microsporangium and label its wall layers. Write briefly about the wall layers.
Q5. Describe the process of Fertilization in angiosperms.
Q6. Write a brief account on agents of pollination.
Q1. Vivipary automatically limits the number of offsprings in a litter. How
Q2. Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest the method of pollination in such plants.
Q3. What is polyembryony and how can it be commercially exploited?
Q4. Are parthenocarpy and apomixis different phenomena ? Discuss their benefits.
Q5. Why does the zygote begin to divide only after the division of Primary endosperm cell (PEC)?
Q6. The generative cell of two-celled pollen divides in the pollen tube but not in a three-celled pollen. Give reasons.