Chapter 32, Problem 1U

Summary Introduction

Introduction:

Fungi constitute a group of eukaryotic organisms that include yeasts, molds, mushroom and smuts.

Answer to Problem 1U

Correct answer:

Ability to conduct photosynthesis is not a characteristic of a fungus. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

Fungi lack chloroplasts and hence they cannot conduct photosynthesis. They are heterotrophs that obtain food from their surroundings by secreting digestive enzymes and then absorbing the organic molecules produced as a result of external digestion.

Option c. is given as “ability to conduct photosynthesis”.

As, “Fungus cannot conduct photosynthesis”, is the right answer.

Hence, option c. is correct.

Reason for the incorrect statements:

Option a. is given as “Cell wall made of chitin”.

Fungus has cell wall made up of polysaccharide called chitin, so, it is a wrong answer.

Option b. is given as “A form of mitosis different from plants and animals”.

Fungus undergoes a different form of mitosis in which the nuclear envelope does not breakdown and reform, and the spindle apparatus is formed within the nucleus, so, it is a wrong answer.

Option d. is given as “Filamentous structure”.

Fungus may be either unicellular or filamentous structure, so, it is a wrong answer.

Hence, options a, b, and d are incorrect.

Conclusion

Fungus is heterotroph that obtains food from their surroundings by external digestion.