Question

How many meiotic division required for 100 seeds 50 grain 12 fruit

Answer 1

203

Answer 2

To determine the total number of meiotic divisions required, we need to calculate the divisions needed for both male gametes (pollen grains) and female gametes (eggs) for the total number of seeds/reproductive units.

Key principles:

1. For male gametes (pollen grains): In plants, one meiotic division in a microspore mother cell produces four microspores, each developing into a pollen grain. Therefore, to produce N pollen grains, N/4 meiotic divisions are required.
2. For female gametes (eggs): In plants, one meiotic division in a megaspore mother cell typically produces one functional megaspore (egg) and three degenerating megaspores. Therefore, to produce N eggs, N meiotic divisions are required.
3. Total meiotic divisions for N seeds: Since each seed results from the fusion of one pollen grain and one egg, N seeds require N pollen grains and N eggs. Total divisions = (Divisions for pollen) + (Divisions for eggs) = (N/4) + N = 5N/4.

Applying to the given problem: The question asks for meiotic divisions for "100 seeds 50 grain 12 fruit". We interpret this as needing to produce a total quantity of reproductive units:

• 100 seeds: These are explicitly stated as seeds.
• 50 grain: Grains (like cereal grains) are a type of fruit, typically single-seeded. So, 50 grains imply 50 seeds.
• 12 fruit: Fruits contain seeds. If the number of seeds per fruit is not specified, the simplest assumption for such problems is often one seed per fruit, especially when "grain" (a single-seeded fruit) is also mentioned. So, 12 fruits imply 12 seeds.

Therefore, the total number of seeds (N) required is: N = 100 (from seeds) + 50 (from grains) + 12 (from fruits) = 162 seeds.

Now, calculate the meiotic divisions for N = 162 seeds:

• Meiotic divisions for pollen grains: 162 / 4 = 40.5 divisions
• Meiotic divisions for eggs: 162 divisions

Total meiotic divisions: Total = 40.5 (for pollen) + 162 (for eggs) = 202.5 divisions.

Since meiotic divisions are discrete biological events, you cannot have a fraction of a division. To ensure that enough gametes are produced, we must round up to the next whole number. Total meiotic divisions = 203.

The final answer is $\boxed{\text{203}}$.

Explanation:

The problem requires calculating meiotic divisions for a combined total of reproductive units. Each seed requires one pollen grain and one egg. Pollen formation needs 1/4 meiotic division per pollen, while egg formation needs 1 meiotic division per egg. Summing the given quantities (100 seeds + 50 grains + 12 fruits) as total seeds (assuming 1 seed/grain and 1 seed/fruit) gives 162 seeds. The total meiotic divisions are (162/4) for pollen + 162 for eggs = 40.5 + 162 = 202.5. Rounding up, 203 meiotic divisions are needed.