Chapter 24, Problem 6STP

Summary Introduction

Introduction :

A fern belong to the Pterophyta Division and is characterized by flowering plants with leaves from subterranean, creeping rhizomes. The leaves are grown in tree ferns on a certain woody trunk. The diploid, leaf-bearing sporophyte is the main component of the life-cycle. Rows of brown sori are at the underside of the branches. Each sorus is composed of a sporangia cluster

Answer to Problem 6STP

Correct answer :

The correct answer is option (D) 4

Explanation of Solution

Explanation/justification for the correct answer :

Option (D) 4. The sperm comes in contact with the eggs and zygote is formed. The zygote undergoes mitosis and thus, it enter sporophyte phase where the chromosome number change from haploid to diploid. It mainly impacts fruit ripening. So, the correct answer is option (D).

Explanation for incorrect answer :

Option(A) 1. Spores are produced by meiosis and the chromosome number reduces from diploid to haploid. So, this is an incorrect answer.

Option (B) 2. Spores (n) are released from the sporangium. So, this is an incorrect answer.

Option (C) 3. Each spore germinates and becomes a heart-shaped gametophyte known as prothallus. The haploid gametophyte contains sex organs (antheridia and archegonia), both male and female. So, this is an incorrect answer.