What indicates 'X' and 'Y' in the following diagram?
- X=Egg cell: Y= Synergid
- X= Synergid; Y= Filiform apparatus
- X= Filliform apparatus: Y= Synergid
- X= Egg cell; Y= Filiform apparatus
The Correct Option is C
Solution and Explanation
Synergids are present laterally in egg cells. They also have finger-like projections called filiform apparatus.
The function of synergids are:
They act as shock absorbers when there is an entry of pollen tubes.
They also secrete substances that can attract the pollen tubes
Out of two, one of the degenerates provides the entry of the pollen tubes.
The Filiform apparatus helps in guiding the pollen tube during entry.
Top Questions on sexual reproduction in flowering plants
Answer the following questions:
[(i)] Explain the structure of a mature embryo sac of a typical flowering plant.
[(ii)] How is triple fusion achieved in these plants?
OR
[(i)] Describe the changes in the ovary and the uterus as induced by the changes in the level of pituitary and ovarian hormones during menstrual cycle in a human female.
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- Which of the following types require pollinator but result is genetically similar to autogamy?
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Flowering plants with hermaphrodite flowers have developed many reproductive strategies to ensure cross-pollination. Study the given outbreeding devices adopted by certain flowering plants and answer the questions that follow.
Note : All plants belong to the same species. No pollen tube growth/inhibition of pollen germination on stigma. Pollen germination on stigma.- [(a)] Name and define the outbreeding device described in the above table.
- [(b)] Explain what would have been the disadvantage to the plant in the absence of the given strategy.
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Concepts Used:
Sexual Reproduction
Sexual reproduction takes place in both plants and animals. In sexual reproduction, genetically diverse organisms or sphinx are built this happens when two individuals of unique sex are combined.
The offspring built by sexual reproduction are genetically diverse in nature and can embrace themselves in accordance with the climate and other adaptable conditions many multicellular organisms practice sexual reproduction.
There are four types of sexual reproduction:
- Allogamy
- Internal fertilization
- External fertilization
- Autogamy