EVERYDAY SCIENCE

SCIENCE

PLANT KINGDOM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
There are twenty chromosomes in a somatic cell of maize. Compare the chromosome numbers given below with the organ of the maize plant. Endosperm 30 Pollen grains 10 Root 30 Leaf 20 Which of the above pairs are correctly matched?
A
1,2 and 3
B
1,2 and 4
C
2 and 4
D
Only 4
Explanation: 

Detailed explanation-1: -Hence, in maize, the chromosome number in the diploid meiocytes (2n) is 20. The gametes or the reproductive cells (n) have 10 chromosomes. Since a somatic cell is diploid (2n) has chromosomes from two sets of gametes inherited from each parent, the total number of chromosomes in a somatic cell is 20.

Detailed explanation-2: -Maize and sorghum (Sorghum bicolor) have the same number of chromosomes (2n = 20).

Detailed explanation-3: -So the primary endosperm cell of maize is triploid and has a total of 30 chromosomes.

Detailed explanation-4: -Diploid chromosome number of Apple is 34, Maize is 20, Rice is 24 and Potato is 48. The gametes of apple and rice have half the number of chromosomes than the sporophytic cell. Therefore, it will be 17 and 12 respectively. The meiocyte of maize undergoes meiosis but is diploid itself and will have 20 chromosomes.

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