Question

Differentiate between ‘self-pollination’ and ‘cross-pollination’. Describe double fertilisation in plants.
of class 10

please answer it fast


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Answer 1

Heya!!! Motu here is ur answer⤵⤵⤵

✴Self pollination 

◆ It is the process of transferring the pollens from anther to stigma in the same flower or between two flowers of plant.

◆ Plants in which self pollination take place may not have attractive corolla.

◆ For self pollination a plant should have both gamete i.e. Androcieum (male gamete:- pollen grains, anther, filament) and gynoecium (female gamete:- ovary, ovoules, stigma and style).

◆ Flowers do not depend on other agents like wind, water, insect, human, etc.

◆ Process of reproduction is fast in compare to cross pollination breed plants.

✴Cross pollinaation

◆It is the transfer of pollen grains from the anther of a flower to the stigma of another flower in a different plant of same or different species.

◆ Flowers ate attractive they attracts insects by their nectar or petals.

◆ For cross pollination it is not important to be a complete flower. It can only have one gamete that can be male or female.

◆Agents such as insects, water, wind, human etc are required.

◆ it's quite time taking since it needs agents and proper transfer of pollen grains from another to stigma i.e. from male to female gamete.

✴ Double fertilization 

It is a complex afertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm).

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Answer 2

Cross-pollination: The cross-pollination is defined as deposition of pollen grains from a flower to the stigma of another flower. Commonly, the process is done pollinators that are insects and wind. By insects, the process takes place in several plants like strawberries, grapes, raspberries, tulips, apples, plums, pears, daffodils, and more. While, by wind for different grasses, maple trees, dandelions, catkins, and others.

Self-pollination: In this process, the pollen grains transfer from the stigma of the same or genetically similar flower. The self-pollination can be observed in legumes such as orchids, sunflowers, peas, peanuts, oats, peaches,  potatoes, wheat, and others.

Double Fertilization: Double fertilization is a major characteristic of flowering plants. In this process, two male gametes fuse with one female gamete wherein one male gamete fertilizes the egg to form a zygote, whereas the other fuses with two polar nuclei to form an endosperm.

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