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If the haploid no. of chromosomes in gymnosperm is 12, what will be the no. of chromosomes in its root and endosperm :-
- a)12, 12
- b)12, 24
- c)24, 12
- d)24, 36
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
If the haploid no. of chromosomes in gymnosperm is 12, what will be th...
Root of gymnosperm is a diploid cell which thus has 2n equals 24 chromosomes.
Whereas, endosperm in gymnosperm is haploid in nature with 12 chromosomes.
Haploid chromosome is the characteristic feature of haploid. Triploid endosperms are seen in angiosperms, formed as a result of double fertilisation.
Reproductive organs form cones or strobilus except female organs of Cycas.
Ovule is generally orthotropous, unitegmic with three layers.
Endosperm is formed efore fertilization and is always haploid. Double fertilization is absent.
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If the haploid no. of chromosomes in gymnosperm is 12, what will be th...
The haploid number of chromosomes in gymnosperms is given as 12. To determine the number of chromosomes in the root and endosperm, we need to understand the process of fertilization and the formation of these structures.
1. Fertilization in gymnosperms:
- Gymnosperms are seed-bearing plants that include conifers, cycads, and ginkgo.
- They have separate male and female gametophytes.
- The male gametophyte produces pollen grains, which contain the male gametes (sperm).
- The female gametophyte develops in the ovule and contains the egg.
- Pollination occurs when pollen is transferred to the ovule.
2. Formation of the endosperm:
- After pollination, the pollen tube grows and delivers the sperm to the egg.
- Fertilization occurs when the sperm fuses with the egg, forming a zygote.
- In gymnosperms, the endosperm is formed as a result of double fertilization.
- The second sperm fuses with the central cell of the female gametophyte, resulting in the formation of the endosperm.
3. Chromosome number in the root:
- The root of a gymnosperm develops from the zygote, which is formed by the fusion of a sperm and an egg.
- Since the haploid number of chromosomes in gymnosperms is 12, the zygote will have a diploid number of chromosomes, which is double the haploid number.
- Therefore, the root will have 24 chromosomes.
4. Chromosome number in the endosperm:
- The endosperm is formed by the fusion of a sperm and the central cell of the female gametophyte.
- The central cell is also haploid, so the sperm will double the chromosome number.
- Therefore, the endosperm will also have 24 chromosomes.
In conclusion, the number of chromosomes in the root and endosperm of a gymnosperm is 24 and 24, respectively. Thus, the correct answer is option C) 24, 12.
1. Fertilization in gymnosperms:
- Gymnosperms are seed-bearing plants that include conifers, cycads, and ginkgo.
- They have separate male and female gametophytes.
- The male gametophyte produces pollen grains, which contain the male gametes (sperm).
- The female gametophyte develops in the ovule and contains the egg.
- Pollination occurs when pollen is transferred to the ovule.
2. Formation of the endosperm:
- After pollination, the pollen tube grows and delivers the sperm to the egg.
- Fertilization occurs when the sperm fuses with the egg, forming a zygote.
- In gymnosperms, the endosperm is formed as a result of double fertilization.
- The second sperm fuses with the central cell of the female gametophyte, resulting in the formation of the endosperm.
3. Chromosome number in the root:
- The root of a gymnosperm develops from the zygote, which is formed by the fusion of a sperm and an egg.
- Since the haploid number of chromosomes in gymnosperms is 12, the zygote will have a diploid number of chromosomes, which is double the haploid number.
- Therefore, the root will have 24 chromosomes.
4. Chromosome number in the endosperm:
- The endosperm is formed by the fusion of a sperm and the central cell of the female gametophyte.
- The central cell is also haploid, so the sperm will double the chromosome number.
- Therefore, the endosperm will also have 24 chromosomes.
In conclusion, the number of chromosomes in the root and endosperm of a gymnosperm is 24 and 24, respectively. Thus, the correct answer is option C) 24, 12.
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If the haploid no. of chromosomes in gymnosperm is 12, what will be the no. of chromosomes in its root and endosperm :-a)12, 12b)12, 24c)24, 12d)24, 36Correct answer is option 'C'. Can you explain this answer?
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