Question:
The total number of nuclei involved in double fertilisation in angiosperms are
The total number of nuclei involved in double fertilisation in angiosperms are
Updated On: Aug 1, 2022
- two
- three
- four
- five
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The Correct Option is D
Solution and Explanation
Double fertilisation is an event unique to angiosperms. It involves fusion of one male gamete (haploid) with egg (haploid) to form zygote (diploid) that gives rise to embryo accompained with fusion of other male gamete (haploid) with two polar nuclei (secondary nucleus) to form primary endosperm nucleus $(PEN)$ that gives rise to a nutritive tissue called endosperm. Hence total of $5$ haploid nuclei are involved in double fertilisation process.
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Concepts Used:
Angiosperms
A type of plant belonging to the kingdom Plantae is angiosperms. The term Angiosperm is acquired from two Greek words: Angio - ‘covered’ and Sperma - ‘seed’. They are the types of plants that contain flowers which is a well-defined feature and the seeds are enfolded within the fruits. Since they can bear both flowers and seeds are also called flowering plants, and also comprises around 80% of the living plants.
The Characteristics of Angiosperms are:
- The body of an angiosperm is evidently differentiated into several organs such as leaves, flowers, fruits, roots, stems, and seeds.
- Among these organs the decision of labor is well-coordinated, and each organ is peerlessly specialized for specific functions.
- Out of all angiosperms, most of them are herbs, shrubs, trees, climbers, etc.
- A vessel is the chief water and mineral that conducts Xylem elements.
- The sieve tube is the chief food that conducts Phloem elements.
- Endosperm has triploid cells.
- The angiosperms are basically divided into two groups, based on the presence of the number of cotyledons in the seed. They are
- Dicotyledonous or Dicot plants
- Monocotyledonous or Monocots Plants