Question

Match List-I with List-II:

Choose the correct answer from the options given below:

• A. (A)- (IV), (B) -(III), (C)- (II), (D)- (I)
• B. (A)- (II), (B) -(I), (C)- (IV), (D)- (III)
• C. (A)- (I), (B) -(II), (C)- (IV), (D)- (III)
• D. (A)- (III), (B) -(I), (C)- (IV), (D)- (II)

Hint:

Basic chromosome number (X) is fundamental to understanding plant genetics and polyploidy.
Carnation: X=15 (2n=30)
Chrysanthemum: X=9 (2n=6x=54)
Tuberose: X=30 (often 2n=60)
Dendrobium: X=19 is common.

Answer 1

The Correct Option is B

We need to match the flower crop with its correct basic chromosome number (X). The basic chromosome number is the number of chromosomes in a single, ancestral set.
(A) Carnation (Dianthus caryophyllus): Diploid carnations have 2n = 30 chromosomes. Therefore, the basic chromosome number X = 15. So, (A) matches with (II).
(B) Chrysanthemum (garden chrysanthemum, Chrysanthemum morifolium or C. grandiflorum): This is a complex hexaploid with 2n = 6x = 54. The basic chromosome number X = 9. So, (B) matches with (I).
(C) Tuberose (Polianthes tuberosa): Chromosome numbers can vary, with diploids having 2n = 60. This suggests a basic chromosome number X = 30 (if diploid) or X = 15 (if tetraploid). Given the option X=30, this is a likely match. So, (C) matches with (IV).
(D) Dendrobium (orchid genus): This is a large genus with diverse chromosome numbers. However, a common basic chromosome number for many Dendrobium species, particularly in important horticultural sections, is X = 19 (leading to diploid 2n=38, tetraploid 2n=76). So, (D) matches with (III). Therefore, the correct matching is: (A) - (II) (Carnation - X=15) (B) - (I) (Chrysanthemum - X=9) (C) - (IV) (Tuberose - X=30) (D) - (III) (Dendrobium - X=19) This corresponds to option (2). (A)- (II), (B) -(I), (C)- (IV), (D)- (III)

Answer 2

Using known basic chromosome numbers (x) as a reference key:
Carnation (Dianthus caryophyllus) is diploid with \( 2n = 30 \), so its basic number is \( x = 15 \) - matching (II).
Garden chrysanthemum is a natural hexaploid with \( 2n = 6x = 54 \), giving \( x = 9 \) - matching (I).
Tuberose (Polianthes tuberosa) commonly shows \( 2n = 60 \) at the diploid level, giving \( x = 30 \) - matching (IV).
Dendrobium orchids commonly carry a basic number of \( x = 19 \) (diploid \( 2n = 38 \)) - matching (III).
Reading these off against List-II in order (A, B, C, D) gives (A)-(II), (B)-(I), (C)-(IV), (D)-(III), which is option (2).