Question:
Sequence the ploidy number according to the fruit crops
(A). 2n=22
(B). 2n=18
(C). 2n=38
(D). 2n=50
Choose the correct answer from the options given below:
Sequence the ploidy number according to the fruit crops
(A). 2n=22
(B). 2n=18
(C). 2n=38
(D). 2n=50
Choose the correct answer from the options given below:
(A). 2n=22
(B). 2n=18
(C). 2n=38
(D). 2n=50
Choose the correct answer from the options given below:
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Remember these standard diploid numbers:
Citrus = 18
Guava = 22
Grape = 38
Pineapple = 50
Citrus = 18
Guava = 22
Grape = 38
Pineapple = 50
Updated On: Jul 31, 2026
- Citrus - Guava - Pineapple - Grape
- Grape - Guava - Citrus - Pineapple
- Pineapple - Citrus - Guava - Grape
- Guava - Citrus - Grape - Pineapple
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Ploidy level and chromosome number (\(2n\)) are key cytogenetic characteristics that define the genetic structure and breeding behavior of fruit crops.
Most cultivated fruit species are diploids, although polyploidy is common.
Knowing the exact diploid chromosome number is essential for carrying out cytological studies, polyploidy breeding, and gene mapping.
Step 2: Detailed Explanation:
Let us identify the somatic chromosome number (\(2n\)) for each of the listed fruit crops to establish the correct sequence:
(A) \(2n = 22\) \(\rightarrow\) Guava (Psidium guajava):
The basic chromosome number of guava is \(x = 11\), and the standard cultivated commercial varieties are diploid, with a somatic chromosome number of \(2n = 2x = 22\).
(B) \(2n = 18\) \(\rightarrow\) Citrus species:
The genus Citrus has a basic chromosome number of \(x = 9\).
The vast majority of citrus species (including sweet orange, mandarin, acid lime, and lemon) are diploid, with a somatic chromosome number of \(2n = 2x = 18\).
(C) \(2n = 38\) \(\rightarrow\) Grape (Vitis vinifera):
The basic chromosome number for the genus Vitis is \(x = 19\).
Cultivated European grapes are diploid, with a somatic chromosome number of \(2n = 2x = 38\).
(D) \(2n = 50\) \(\rightarrow\) Pineapple (Ananas comosus):
The genus Ananas has a basic chromosome number of \(x = 25\).
Standard commercial cultivars like Smooth Cayenne are diploid, with a somatic chromosome number of \(2n = 2x = 50\).
Matching these crops to the sequence (A), (B), (C), (D) yields: Guava (\(2n=22\)) - Citrus (\(2n=18\)) - Grape (\(2n=38\)) - Pineapple (\(2n=50\)).
This corresponds to option (D).
Step 3: Final Answer:
Hence, the correct sequence of fruit crops is Guava - Citrus - Grape - Pineapple.
Ploidy level and chromosome number (\(2n\)) are key cytogenetic characteristics that define the genetic structure and breeding behavior of fruit crops.
Most cultivated fruit species are diploids, although polyploidy is common.
Knowing the exact diploid chromosome number is essential for carrying out cytological studies, polyploidy breeding, and gene mapping.
Step 2: Detailed Explanation:
Let us identify the somatic chromosome number (\(2n\)) for each of the listed fruit crops to establish the correct sequence:
(A) \(2n = 22\) \(\rightarrow\) Guava (Psidium guajava):
The basic chromosome number of guava is \(x = 11\), and the standard cultivated commercial varieties are diploid, with a somatic chromosome number of \(2n = 2x = 22\).
(B) \(2n = 18\) \(\rightarrow\) Citrus species:
The genus Citrus has a basic chromosome number of \(x = 9\).
The vast majority of citrus species (including sweet orange, mandarin, acid lime, and lemon) are diploid, with a somatic chromosome number of \(2n = 2x = 18\).
(C) \(2n = 38\) \(\rightarrow\) Grape (Vitis vinifera):
The basic chromosome number for the genus Vitis is \(x = 19\).
Cultivated European grapes are diploid, with a somatic chromosome number of \(2n = 2x = 38\).
(D) \(2n = 50\) \(\rightarrow\) Pineapple (Ananas comosus):
The genus Ananas has a basic chromosome number of \(x = 25\).
Standard commercial cultivars like Smooth Cayenne are diploid, with a somatic chromosome number of \(2n = 2x = 50\).
Matching these crops to the sequence (A), (B), (C), (D) yields: Guava (\(2n=22\)) - Citrus (\(2n=18\)) - Grape (\(2n=38\)) - Pineapple (\(2n=50\)).
This corresponds to option (D).
Step 3: Final Answer:
Hence, the correct sequence of fruit crops is Guava - Citrus - Grape - Pineapple.
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