Text Chapter 12: Fungi Flashcards Preview

Biology 3 > Text Chapter 12: Fungi > Flashcards

Flashcards in Text Chapter 12: Fungi Deck (14):
1

Unique Properties of Fungi

eukaryotic, most are multicellular, filamentous body plan, heterotrophic by absorption, produce spores by sexual and asexual reproduction, haploid for part or most of life cycle, cell wall made of chitin, no movement- change location by growth of body or dispersion of spores

2

Body Plan of Fungi

mycelium, hypha, septum, reproductive structure extends from main body, produces spores

3

Mycelium

network or filaments

4

Hypha

individual filaments

5

Septum

partition dividing cells, has pore for distribution of nutrients

6

General Mode of Nutrition for Fungi

heterotrophic by absorption- secrete digestive enzymes, digest macromolecules outside the body, absorb digested nutrients

7

Three Types of Interactions

saprophytic, parasitic, mutualistic

8

Saprophytic

digestion of dead organisms, act as decomposers

9

Parasitic

digestion of live organisms, causing disease

10

Mutualistic

beneficial relationship for two independent organisms

11

The process of sexual reproduction in fungi

hypha from mycelia of opposite mating types fuse, fusion of two haploid nuclei form diploid zygote, zygote produces haploid spores by meiosis, each spore germinates to form a haploid mycelium

12

Three Mutualistic Relationships Involving Fungi

algae and fungus, plant roots and fungus, leaf cutter ants and fungus

13

Beneficial Effects of Fungi

act as decomposers in ecosystems, can break down pollutants, produce antibiotics, assist in plant growth, pioneer species allowing colonization of soil-poor areas, provide food for other organisms

14

Key events in the interaction between Cordyceps fungus and ants

-hyphae fungus enters the ant
-mycelium grows within the body of the ant
-interferes with pheromones which cause the ant to climb a plant and attach to a leaf
-fruiting body grows from the ant’s head
-uninfected ants carry infected ants away
-spores are produced first by mitosis, them by meiosis
-beneficial in controlling the size of the population and for possible pharmaceutical uses