CBSE 2023 · Region 1 · Set 1 · Q18 · 2 marks
(a)From which end of the ovule, and how does the pollen tube gain its entry into the embryo sac of a Hibiscus flower ?(b)State the fate of the male nuclei present in the pollen tube.
(a)
From which end of the ovule, and how does the pollen tube gain its entry into the embryo sac of a Hibiscus flower ?
(b)
State the fate of the male nuclei present in the pollen tube.
Marking-scheme solution
(a)
From micropylar end, through the synergids (filiform apparatus)/filiform (within synergids) apparatus guides the entry of pollen tube (b) One male nucleus fuses with two polar nuclei to form Primary endosperm nucleus and termed triple fusion, other male nucleus fuses with egg cell nucleus to form zygote i.e. undergoes Syngamy
Sexual Reproduction in Flowering PlantsPre-fertilisation: Structures and EventsUnderstandvery_short_answermedium
Practice Sexual Reproduction in Flowering Plants →All Sexual Reproduction in Flowering Plants questions
More from Sexual Reproduction in Flowering Plants
- Choose the option that gives the correct number of pollen grains that will be formed after 325 microspore…2026 · asked 5×
- Explain the process of the development of a male gametophyte in an angiosperm. Why is it called a male…2023 · asked 3×
- Given below are stages of embryo sac formation from megaspore mother cell. Identify the correct option for…2026 · asked 3×
- Given below is a flower with its characteristic features specialised for the most common type of abiotic…2025 · asked 3×
- (i) Explain the structure of a typical monocotyledonous embryo of a flowering plant. (ii) How are multiple…2025 · asked 3×
- The following question is based on pollination. Study the figures carefully and answer the questions that…2025 · asked 3×
- Select the option that shows the correctly identified 'U', 'X', 'Y' and 'Z' in a developing dicot embryo.2023 · asked 3×
- "Farmers prefer apomictic seeds to hybrid seeds." Justify giving two reasons. OR Mention one advantage and…2024 · asked 3×
CBSE Class 12 Biology past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.