Q.3. Compare and contrast between monocots and dicot plants in term of root, ste
ID: 3165816 • Letter: Q
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Q.3. Compare and contrast between monocots and dicot plants in term of root, stem and leaves. 20 Points Q.4. Describe how water absorbed from root and translocated into leaves through xylem and the exuded from leaves? 30 Points Q.5. Explain the importance of these three elements for plant growth and development Nitrogen, Phosphorus and Potassium. Provided a complete answer, for example, their absorption form, how they are translocated into cells, their main functions in the cell, the deficiency symptoms etc.. 30 Points Q.6. A farmer started his pistachio farms 4 years ago. He was expecting the first harvest this year. However, the flowers were produced, but no fertilization occurred on these flower. Explain what is the possible explanation for what happened in this field? 5 points Q.7. Describe the pollination and fertilization process in full details. 20 Points.Explanation / Answer
Pollination: The action of pollen falling on the stigma
Pollination can be aided by wind (Anemophily), water (Hydrophily) or animals (Zoophily).
In angiosperms, the pollen germinates when it falls on a receptive stigma. The intine elongates and forms a pollen tube which gets extended through the style to reach ovule. The haploid nucleus in the pollen undergoes one mitotic division to produce a vegetative cell and one reproductive cell. the reproductive cell further undergoes a mitotic division to produce two male gametes. The pollen tube enters the ovule through synergids.
The fusion of male and female gametes is known as fertilization. One male gamete fuses with the egg cell to produce a diploid zygote. The zygote undergoes mitotic divisions to produce the embryo. The second male gamete fuses with the secondary nucleus to form a triploid primary endosperm nucleus (PEN). This is a nutritive tissue that supports the growth of the developing embryo.
This process is known as double fertilization as two male gametes fuse with their respective counterparts.
Triple fusion refers to the fusion of male gamete with the secondary nucleus to produce the PEN.
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