Sexual Reproduction in Flowering Plants
CBSE Class 12 Biology · every board question from this chapter, 2023–2026 · 1 of them repeated across years
- Choose the option that gives the correct number of pollen grains that will be formed after 325 microspore mother cells undergo…2026asked 2×
- Perisperm present in seed of black pepper is remnant of2026
- Which part of the ovule hardens to form seed coat of a seed?2026
- Identify the plant in which emasculation is not required for artificial hybridization.2026
- The cells of endosperm have 24 chromosomes. What will be the number of chromosomes in the gametes?2026
- Filiform apparatus in the embryo sac of an angiosperm is present at the micropylar tip of:2026
- Self-incompatibility in some flowering plants is a mechanism that prevents self-fertilization. Fill in the blank with the…2026
- Given below are stages of embryo sac formation from megaspore mother cell. Identify the correct option for the cell division…2026
- Select the correct option for the pair of plants pollinated by water.2026
- Assertion: Apomixis leads to production of genetically identical off- springs. Reason (R): Apomixis involves fertilization…2026
- Assertion: Cleistogamous flowers have assured seed set. Reason (R): Cleistogamous flowers are invariably autogamous and do not…2026
- Assertion: Pollen grains have a mucilaginous covering on them in most of the water pollinating plants. Reason (R): Mucilaginous…2026
- Mention the functions of each of the following: (i) Tassels of Corn Cob (ii) Scutellum OR Farmers prefer apomictic seeds over…2026
- Write one way by which apomictic seeds can be developed. Why do farmers prefer apomictic seeds over hybrid seeds?2026
- Differentiate between wind-pollinated and insect-pollinated flowers. Give an example of each type.2026
- Do all pollen grains remain viable for the same length of time? Support your answer with two suitable examples. How are pollen…2026
- List any three outbreeding devices that flowering plants have developed for cross-pollination and explain how they help to…2026
- Chasmogamous flowers remain open and expose their reproductive parts. Explain how this structural feature supports different…2026
- Draw a neat diagram of enlarged view of one microsporangium of a Young anther of an angiosperm. Label the different layers of the…2026
- Answer the following questions: Explain the different ways by which apomictic seeds can be developed. Mention one advantage of…2026
- Draw a neat diagram of megasporangium of an angiosperm and label any six parts.2026
- Draw a neat diagram of a maize grain showing the internal structure and label any five parts.2026
- In angiosperms, the female gametophyte develops from a single cell of megasporangium. (i) Name that cell of megasporangium and…2026
- (i) Explain the role of stigma in pollen pistil interaction. (ii) Describe the post pollination events leading to double…2026
- Study the flow chart given below. Name the hormones involved at each stage and explain their functions. OR (i) Draw a diagram of…2026
- Some flowers are unisexual, this property of unisexuality of flowers prevents which kind of pollination?2025
- Given below is a diagram of T.S. of a monocot seed with parts I, II & III labelled: Choose the option where parts I, II and III…2025
- Diameter of the pollen grain generally is2025
- Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by2025
- The diagram given below shows labelling of four parts of a dicot embryo during its development as P, Q, R and S. Choose the…2025
- Select the statements that are true for a typical monocotyledonous embryo from the given options. (i) Scutellum is present…2025
- Given below are the events that are observed in an artificial hybridisation programme. Arrange them in the correct sequential…2025
- Unisexuality of flowers prevents which process?2025
- Choose the option that correctly describes the gynoecium of Michelia:2025
- Select the following statements that are true for insect pollinated flowers from the given options. (i) Majority of these flowers…2025
- Select the statements that are true for a typical dicotyledonous embryo from the given options. (i) It consists of an embryonal…2025
- Endosperm is completely consumed by the developing embryo in which of the following?2025
- Select the statements that are true for pollination mechanism in flowering plants from the given options. (i) In Vallisneria, the…2025
- Select the statements that are true for outbreeding devices in the flowering plants. (i) They discourage cross-pollination and…2025
- Select the statements that are true for a typical megasporangium of flowering plants. (i) It is attached to the placenta by…2025
- Select the statements that are true for the seed of angiosperm from the given options: (i) Non-albuminous seeds have no residual…2025
- Select the statements that are true for embryo of the flowering plants from the given options. (i) The zygote forms a proembryo…2025
- How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 50 microspore…2025
- The diagram given below shows labelling of four parts of a dicot embryo during its development as P, Q, R and S. Choose the…2025
- Assertion: Perisperm is a diploid tissue. Reason (R): Perisperm is the remains of nucellus which surrounds the embryo in certain…2025
- Assertion: In some species of asteraceae and grasses, seeds are formed without fertilization. Reason (R): Formation of fruit…2025
- Student to attempt either option or. Comment upon the mode of pollination in Vallisneria and Zostera. OR Mention any four…2025
- Student to attempt either option or: (i) Write two crucial changes, the seed undergoes while reaching maturity that enable them…2025
- Flowering plants with hermaphrodite flowers have developed many reproductive strategies to ensure cross-pollination. Study the…2025
- A bilobed dithecous anther has 200 microspore mother cells per microsporangium. How many male gametophytes can be produced by…2025
- A bilobed dithecous anther has 200 microspore mother cells per microsporangium. How many male gametophytes can be produced by…2025
- Given below is a flower with its characteristic features specialised for the most common type of abiotic pollination. Answer the…2025
- Many of the flowering plants producing hermaphrodite flowers have developed many devices to discourage self-pollination and to…2025
- The following question is based on pollination. Study the figures carefully and answer the questions that follow. Pollens Figure…2025
- (i) Explain how does double fertilisation take place in a flowering plant. (ii) Write the fate of the products of double…2025
- Student to attempt either option- or: Distinguish between the two cells enclosed in a mature male gametophyte of an angiosperm.…2025
- (i) Explain the structure of a mature embryo sac of a typical flowering plant. (ii) How is triple fusion achieved in these…2025
- What is meant by 'right' and 'wrong' type of pollen when pollen lands on the stigma. A two-celled right type pollen has landed on…2025
- (i) Explain the structure of a typical monocotyledonous embryo of a flowering plant. (ii) How are multiple embryos formed in a…2025
- In which of the following plants are both male and female flowers born on the same plant and the mode of pollination can be…2024
- An angiosperm embryo sac is located within the:2024
- In a fertilized ovule of an angiosperm, the cells in which n, 2 n and 3 n conditions respectively occur are:2024
- The ploidy of the apomictic embryos developing from the integument cells and synergids respectively would be:2024
- The part of the ovule that develops into protective coats of a seed after fertilization in a typical flowering plant is:2024
- Embryo formation without fertilization is observed in some species of:2024
- The ploidy of apomictic embryos developing from the nucellus and antipodal cells respectively would be:2024
- The mechanism to produce seeds without fertilisation has evolved in the given family of the flowering plants:2024
- In which one of the following floral plants are many embryos formed in the seeds without fertilisation of the egg cell?2024
- Study the following diagram of Transverse Section of a young anther of an angiosperm: Select the option where parts 'A', 'B' and…2024
- A phenomenon where a male insect mistakenly identified the patterns of a orchid flower as the female insect partner, and tries to…2024
- Identify the correct labellings in the figure of a fertilised embryo sac of an angiosperm given below:2024
- The functional megaspore of an angiosperm develops into:2024
- Assertion: A given fig species can be pollinated only by its partner' wasp. Reason (R): The wasp pollinates the fig inflorescence…2024
- Assertion: The zygote gives rise to heart-shaped embryo and subsequently proembryo in most angiosperms. Reason (R): The zygote is…2024
- "Farmers prefer apomictic seeds to hybrid seeds." Justify giving two reasons. OR Mention one advantage and one disadvantage of…2024
- Identify A, B, C and D in the table given below:2024
- Do you think apomixis can be compared to asexual reproduction? Justify your answer. State the benefits of apomixis to the farmers.2024
- Draw a T.S. of a mature anther of an angiosperm. Label its any three wall layers and mention their functions.2024
- Draw a longitudinal section of pistil of a flower showing growth of the pollen tube. Label the part: through which the pollen…2024
- Draw a well labelled diagram of sectional view of male gametophyte/microspore of an angiosperm and write the functions of any two…2024
- If the cells in the leaves of a maize plant contain 10 chromosomes each, write the number of chromosomes in its endosperm and…2024
- Explain how it is ensured that the orchid Ophrys is pollinated by a specific species of bee. Describe co-evolution with the help…2024
- (i) Explain the process of double fertilization in an angiosperm starting from the germination of pollen grains on the stigma,…2024
- (i) Draw a diagram of a human sperm. Label any four parts and write their functions. (ii) In a human female, probability of an…2024
- Which of the following structures is well-developed in a mature seed of black pepper?2023
- Select the option that shows the correctly identified 'U', 'X', 'Y' and 'Z' in a developing dicot embryo.2023
- Match the correct Structures given in Column I with the Fruit in Column II in the chart given below:2023
- Which of the following seeds have remained alive for the longest period?2023
- Assertion: Endosperm is completely consumed during the development of embryo in ex-albuminous seeds. Reason (R): Castor, pea and…2023
- Explain the process of the development of a male gametophyte in an angiosperm. Why is it called a male gametophyte?2023
- From which end of the ovule, and how does the pollen tube gain its entry into the embryo sac of a Hibiscus flower? State the fate…2023
- (i) Explain the monosporic development of embryo sac in the ovule of an angiosperm. (ii) Draw a diagram of the mature embryo sac…2023
- Given below is a diagrammatic representation of a human ovum. (i) Identify the parts 'a', 'b' and 'c'. (ii) This ovum is released…2023
- Study the diagram given below showing the modes of pollination. Answer the questions that follow. (i) The given diagram shows…2023
- (i) Describe the arrangement of nuclei and cells in a mature embryo sac of a typical angiosperm. (ii) Explain the devices the…2023
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