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Chapter 25: Q. 14 (page 667)

The chromosome complement in a moss protonema is:

a. 1n

b. 2n

c. 3n

d. varies with the size of the protonema

Short Answer

Expert verified

Option (a) 1n

Step by step solution

01

Step 1. Introduction 

Chromosome compliment: It can be defined as the total number of chromosomes present in a species of any living organism.

Protonema: It is the prime thalloid stage of the gametophyte. It is filamentous and affluent in chlorophyll.

02

Step 2. Explanation for correct option.

  • The protonema is a structure which is extensively found in moss.
  • The spores present in moss are of haploid nature i.e., contains only half number of chromosomes.

Hence, 1n is the ploidy of a moss protonema.

03

Step 3. Explanation for incorrect answer.

  • Since, the spore of a moss is haploid in nature and not diploid so 2n is an incorrect ploidy.
  • 3n ploidy is invalid as no living organism consist such number of chromosomes.
  • The size of any living organism does not affect its chromosome ploidy

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Most popular questions from this chapter

A botanist travels to an area that has experienced a long, severe drought. While examining the bryophytes in the area, he notices that many are in the same life-cycle stage. Which life-cycle stage should be the most common?

a. zygote

b. gametophyte

c. sporophyte

d. archegonium

Stomata appear in which group of plants?

a. Charales

b. liverworts

c. hornworts

d. mosses

Which of the the following statements about plant divisions is false?

a. Lycophytes and pterophytes are seedless vascular plants.

b. All vascular plants produce seeds.

c. All non-vascular embryophytes are bryophytes.

d. Seed plants include angiosperms and gymnosperms.

Which of the following statements of the fern life cycle is false?

a. Sporangia produce haploid spores.

b. The sporophyte grows from a gametophyte.

c. The sporophyte is diploid and the gametophyte is haploid.

d. Sporangia form on the underside of the gametophyte.

Bryophytes form a monophyletic group that transitions between green algae and vascular plants. Describe atleast one similarity and one difference between bryophyte reproduction and green algae reproduction.
See all solutions

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