Biology Chapter 11

True or False: All algae have roots, stems, and leaves.

False: For example, algae do not have roots, stems, or leaves.

True or False: All protists are multicellular.

False: Most protists are single-celled. Some are multicellular.

True or False: Protists are prokaryotes.

False: Protists are the simplest eukaryotes.

True or False: Protists cannot reproduce sexually.

False: Protists have complex life cycles that may include both sexual and asexual reproduction.

True or False: Protists have no way of moving on their own; they must hitch a ride with a motile organism.

False: Some protists, like protozoans can move on their own.

True or False: Malaria is caused by algae that live in protozoa.

False: There are also parasitic protozoa that live in or on living hosts. For example, the protozoan that causes malaria lives inside a human host.

True or False: Sporozoan protozoa are those that move only when they are adults.

False:

True or False: All algae reproduce only by sexual reproduction.

False: Algae have varied life cycles. Both cycles include phases of asexual reproduction (haploid) and sexual reproduction (diploid).

True or False: Protozoa are fungus-like protists.

False: Animal-like protists are commonly called protozoa (singular, protozoan).

True or False: Diatoms are a type of protozoa.

False: Diatoms are plant-like protists.

Describe cilia.

Cilia are similar to flagella, except they are shorter and there are more of them. They may completely cover the surface of the protist cell.

True or False: Kelp are multicellular organisms that live in the ocean.

Multicellular seaweeds called kelp may grow as large as trees. They are the food base of ecosystems called kelp forests. Kelp forests are found throughout the ocean in temperate and arctic climates. They are highly productive ecosystems. 64.hh

Protozoa can get their food by a. eating dead organic material. b. preying on other organisms and engulfing and digesting them. c. eating algae. d. all of the above.

Protozoa generally feed by engulfing and digesting other organisms. As consumers, they have various roles in food chains and webs. Some are predators. They prey upon other single-celled organisms, such as bacteria. In fact, protozoa predators keep many bacterial populations in check. Other protozoa are herbivores. They graze on algae. Still others are decomposers.

When will slime molds will start to swarm?

Slime molds are fungus-like protists commonly found on rotting logs and compost. They move very slowly in search of decaying matter to eat. When food is scarce, individual cells swarm together to form a blob-like mass, like the "dog vomit" slime mold. The mass glides along on its own secretions, engulfing decaying organic matter as it moves over it.

True or False: protists require a watery environment in which to live. True

True

True or False: Algae are protists.

True: An example is a protist called Spirogyra, a type of algae

True or False: Spores can be produced by some protists as a response to harsh conditions in their environment.

True: In a stressful environment, such as one that is very dry, Spirogyra may produce tough spores that can withstand harsh conditions. Spores are reproductive cells produced by protists (and other organisms).

True or False: Protists contain organelles.

True: Like all other eukaryotes, protists have a nucleus containing their DNA. They also have other membrane-bound organelles, such as mitochondria.

True or False: Many protozoa are single-celled organisms.

True: Most protozoa consist of a single cell.

True or False: Some protists eat algae.

True: Other protozoa are herbivores. They graze on algae.

True or False: Some protists are multicellular organisms.

True: Plant-like protists are called algae (singular, alga). They are a large and diverse group. Some algae, diatoms, are single-celled. Others, such as seaweed, are multicellular.

True or False: Protists are often classified based on how similar they are to animals, fungi, or plants.

True: Protists are often classified based on how similar they are to other eukaryotes—animals, plants, and fungi.

True or False: Some protists can carry out photosynthesis.

True: Protists have complex life cycles that may include both sexual and asexual reproduction. They get food through ingestion, absorption, or photosynthesis.

True or False: Some protozoa eat bacteria.

True: Protozoa generally feed by engulfing and digesting other organisms. As consumers, they have various roles in food chains and webs. Some are predators. They prey upon other single-celled organisms, such as bacteria. In fact, protozoa predators keep many bacterial populations in check.

True or False: On rotting logs, one may find slime molds

True: Slime molds are fungus-like protists commonly found on rotting logs and compost.

True or False: Fish may have parasites called water molds.

True: Some water molds are parasites of fish and other aquatic organisms.

The type of protozoan that uses psuedopods (false feet) to move is a. an amoeboid protozoan. b. an algae. c. a ciliate protozoan. d. a sporozoan

a. an amoeboid protozoan

Which of the following is not a type of protozoa? a. bacteria b. flagellate c. amoeboid d. sporozoan

a. bacteria

Fungus-like protists have a. cell walls made of cellulose. b. chloroplasts for photosynthesis. c. cell walls made of chitin. d. none of the above.

a. cell walls made of celluose

Ingestive protists obtain food by a. engulfing the food. b. diffusion. c. osmosis. d. photosynthesis.

a. engulfing the food Ingestive protists ingest, or engulf, bacteria and other small particles.

Photosynthesis is a. the process of transforming light energy into chemical energy (food). b. a type of cell movement. c. the process of engulfing food particles. d. none of the above.

a. the process of transforming light energy into chemical energy (food). The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthetic protists use light energy to make food.

Water molds are a. a type of animal-like protist. b. found only in the ocean. c. a type of fungus-like protist. d. found only in Australia.

c. a type of fungus-like protist. Two major types of fungus-like protists are slime molds and water molds.

The common feature shared by dinoflagellates, euglenids, green algae, and red algae is that they a. never carry out photosynthesis. b. all are multicelluar organisms. c. all have chlorophyll. d. all of the above

c. all have chlorophy.

The fusion of two Spirogyra spores to form a diploid zygote is an example of a. binary fission. b. triploid fission. c. sexual reproduction. d. asexual reproduction.

c. sexual reproduction

Algae are considered plant-like because a. they eat dead organic matter. b. they have roots, stems, and leaves. c. they have chloroplasts and carry out photosynthesis. d. they are often unicellular.

c. they have chloroplasts and carry

Which location is least likely to have a population of protists? a. damp soil b. ocean c. lake d. desert

d. desert Most protists are aquatic organisms. They need a moist environment to survive. They are found mainly in damp soil, marshes, puddles, lakes, and the ocean.