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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

The dominant organism in fern is the ________.

a. sperm

b. spore

c. gamete

d. sporophyte

Which one of these characteristics is present in land plants and not in Charales?

a. alternation of generations

b. flagellated sperm

c. phragmoplasts

d. plasmodesmata

Which of the following traits of land plants allows them to grow in height?

a. alternation of generations

b. waxy cuticle

c. tracheid

d. sporopollenin

Stomata appear in which group of plants?

a. Charales

b. liverworts

c. hornworts

d. mosses

Alternation of generations means that plants produce:

a. only haploid multicellular organisms

b. only diploid multicellular organisms

c. only diploid multicellular organisms with single celled haploid gametes

d. both haploid and diploid multicellular organisms
See all solutions

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