Question

If the haploid no. of chromosomes in gymnosperm is 12, what will be no. of chromosomes in its root and endosperm?

• A. 12, 12
• B. 12, 24
• C. 24, 12
• D. 24, 36

Answer 1

Answer: (C)

24, 12

Root of gymnosperm is diploid which thus has 2n equals 24 chromosomes.

Endosperm in gymnosperm is haploid in nature with 12 chromosomes.. 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 before fertilization and is always haploid. Double fertilization is absent.

So, the correct answer is '24, 12'