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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

What is the difference between extant and extinct?

Why do mosses grow well in the Arctic tundra?

a. They grow better at cold temperatures.

b. They do not require moisture.

c. They do not have true roots and can grow on hard surfaces.

d. There are no herbivores in the tundra

The dominant organism in fern is the ________.

a. sperm

b. spore

c. gamete

d. sporophyte

The following structures are found on the underside of fern leaves and contain sporangia:

  1. sori

  2. rhizomes

  3. megaphylls
  4. microphylls

How did the development of a vascular system contribute to the increase in size of plants?
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