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Endosperm polyembryony is type of
- a)Adventitive polyembryony
- b)True polyembryony
- c)False polyembryony
- d)Gametophytic polyembryony
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Endosperm polyembryony is type ofa)Adventitive polyembryonyb)True poly...
The occurrence of multiple embryos in a seed is known as polyembryony. Polyembryony can be divided into two types:
1. True polyembryony: In this type, more than one embryos are formed within a single embryo sac. The extra embryos may arise from the cleavage of egg or zygote, from the synergids or antipodal cells or from the endosperm as all of these lies inside the embryo sac. When the extra embryos develop from the tissues outside the embryo sac, such as nucellus it is called adventitive polyembryony.
2. False polyembryony: When two or more embryos develop from different embryo sacs, it is called false polyembryony. The extra embryos may develop from another megaspore derived from megaspore mother cell or from a different megaspore mother cell. Polyembryony can be gametophytic and sporophytic also. When the extra embryos arise from gametophytic cells of the ovule, it is called gametophytic polyembryony and when they are derived from zygote or proembryo or from initial sporophytic cells of the embryo, it is called sporophytic polyembryony.
Thus, the correct answer is option B.
1. True polyembryony: In this type, more than one embryos are formed within a single embryo sac. The extra embryos may arise from the cleavage of egg or zygote, from the synergids or antipodal cells or from the endosperm as all of these lies inside the embryo sac. When the extra embryos develop from the tissues outside the embryo sac, such as nucellus it is called adventitive polyembryony.
2. False polyembryony: When two or more embryos develop from different embryo sacs, it is called false polyembryony. The extra embryos may develop from another megaspore derived from megaspore mother cell or from a different megaspore mother cell. Polyembryony can be gametophytic and sporophytic also. When the extra embryos arise from gametophytic cells of the ovule, it is called gametophytic polyembryony and when they are derived from zygote or proembryo or from initial sporophytic cells of the embryo, it is called sporophytic polyembryony.
Thus, the correct answer is option B.
Most Upvoted Answer
Endosperm polyembryony is type ofa)Adventitive polyembryonyb)True poly...
Endosperm polyembryony is a type of true polyembryony in which multiple embryos develop from the endosperm of a single fertilized ovule. This phenomenon is commonly observed in citrus fruits and some other plant species.
Explanation:
Endosperm polyembryony is a type of polyembryony in which multiple embryos develop from the endosperm of a single fertilized ovule. This phenomenon is commonly observed in citrus fruits and some other plant species. In endosperm polyembryony, the zygote divides to form two or more embryos, which are genetically identical.
Advantages of Endosperm Polyembryony:
1. Increases the chances of successful germination and survival of the seedlings.
2. Provides a mechanism for vegetative propagation, as multiple plantlets can be produced from a single seed.
Disadvantages of Endosperm Polyembryony:
1. Competition between the multiple embryos for resources in the endosperm can lead to reduced growth and development of the individual embryos.
2. The genetic uniformity of the multiple embryos can limit the genetic diversity of the offspring.
Conclusion:
Endosperm polyembryony is a type of true polyembryony that is observed in some plant species. While it provides advantages in terms of increased chances of successful germination and vegetative propagation, it can also have disadvantages such as competition between the embryos and limited genetic diversity.
Explanation:
Endosperm polyembryony is a type of polyembryony in which multiple embryos develop from the endosperm of a single fertilized ovule. This phenomenon is commonly observed in citrus fruits and some other plant species. In endosperm polyembryony, the zygote divides to form two or more embryos, which are genetically identical.
Advantages of Endosperm Polyembryony:
1. Increases the chances of successful germination and survival of the seedlings.
2. Provides a mechanism for vegetative propagation, as multiple plantlets can be produced from a single seed.
Disadvantages of Endosperm Polyembryony:
1. Competition between the multiple embryos for resources in the endosperm can lead to reduced growth and development of the individual embryos.
2. The genetic uniformity of the multiple embryos can limit the genetic diversity of the offspring.
Conclusion:
Endosperm polyembryony is a type of true polyembryony that is observed in some plant species. While it provides advantages in terms of increased chances of successful germination and vegetative propagation, it can also have disadvantages such as competition between the embryos and limited genetic diversity.
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Endosperm polyembryony is type ofa)Adventitive polyembryonyb)True polyembryonyc)False polyembryonyd)Gametophytic polyembryonyCorrect answer is option 'B'. Can you explain this answer?
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