Advertisements
Advertisements
Question
State what is apomixis. Comment on its significance. How can it be commercially used?
Advertisements
Solution
Apomixis is the mode of reproduction which does not involve formation of zygote through gametic fusion.
Significance of apomixis:
(i) Adventives embryos are better clones than cuttings.
(ii) Embryos formed through apomixes are generally free from infections.
Hybrid varieties provide higher and better yield. If hybrid seeds are produced ever year, they do not maintain hybrid characters because of segregation of traits. Moreover, production of hybrid seeds every year is very costly. This can be avoided by introducing apomixes in hybrid seeds.
RELATED QUESTIONS
Explain any three advantages that seeds offer to angiosperms.
Why are some seeds referred to as apomictic seeds?
How polyembryony can be commercially exploited?
Fill in the blank:
The ________contains the egg or ovum.
Fill in the blank:
The ______ is the base of the flower to which other floral parts are attached.
Match the column.
| Column - I (Structure before seed formation) |
Column - II (Structure after seed formation) |
||
| A. | Funiculus | I. | Hilum |
| B. | Scar of ovule | II. | Tegmen |
| C. | Zygote | III. | Testa |
| D. | Inner integument | IV. | Stalk of seed |
| V. | Embryo | ||
Apomixis is a type of reproduction that results is the development of a/an ______.
The polyembryony commonly occurs in ______.
In case of polyembryony, if an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?
Explain following term:
Polyembryony
