Question

Use the following paragraph to answer questions 10 and 11 below. The Brazil nut tree, Bertholletia excelsa (n = 17), is native to tropical rain forests of South America. It is a hardwood tree that can grow to over 50 meters tall, is a source of high-quality lumber, and is a favorite nesting site for harpy eagles. As the rainy season ends, tough-walled fruits, each containing 8-25 seeds (Brazil nuts), fall to the forest floor. Brazil nuts are composed primarily of endosperm. About $50 million worth of nuts are harvested each year. Scientists have discovered that the pale yellow flowers of Brazil nut

Answer 1

a) Number of chromosome in yellow flowers is 34 because the flower is diploid(2n=34).

b) Microspores are haploid structures and are produced from diploid microsporocytes by meiosis in the anthredium.

c) Female gametophyte also known as megagametophyte produced from megaspores(n=17) which are haploid inside the ovule by mitosis.Thus, female gametophyte is also haploid(n=17).

d) The Brazil nut tree is diploid with total number of 34 chromosome (2n=34).

Thus, statement 1 and 2 are true.