Câu hỏi:

11/09/2023 880

(1) The protozoans, minute, aquatic creatures each of which consists of a single cell of protoplasm, constitute a classification of the most primitive forms of animal life. They are fantastically diverse, but three major groups may be identified on the basis of their motility. The Mastigophora have one or more long tails, which they use to project themselves forward. The Ciliata, which use the same basic means for locomotion as the Mastigophora, have a larger number of short tails. The Sarcodina, which include amoebae, float or row themselves about on their crusted bodies.

(2) In addition to their form of movement, several other features discriminate among the three groups of protozoans. For example, at least two nuclei per cell have been identified in the Ciliata, usually a large nucleus that regulates growth but decomposes during reproduction, and a smaller one that contains the genetic code necessary to generate the large nucleus.

(3) Protozoans are considered animals because, unlike pigmented plants to which some protozoans are otherwise almost identical, they do not live on simple organic compounds. Their cell demonstrates all of the major characteristics of the cells of higher animals.

(4) Many species of protozoans collect into colonies, physically connected to each other and responding uniformly to outside stimulate. Current research into this phenomenon, along with investigations carried out with advanced microscopes may necessitate a redefinition of what constitutes protozoans, even calling into question the basic premise that they have only one cell. Nevertheless, with the current data available, almost 40,000 species of protozoans have been identified. No doubt, as the technology improves our methods of observation, better models of classification will be proposed.

Where do protozoans probably live?

(A) Water

(B) Sand

(C) Grass

(D) Wood

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Câu hỏi trong đề: 32000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án !!

Bắt đầu thi

Trả lời:

Giải bởi Vietjack

Đáp án A

(1) The protozoans, minute, aquatic creatures each of which consists

Aquatic: sống ở nước

Câu hỏi cùng đoạn

Câu 2:

What is protoplasm?

(A) A class of protozoan

(B) The substance that forms the cell of a protozoan

(C) A primitive animal similar to a protozoan

(D) An animal that developed from a protozoan

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Lời giải của GV VietJack

Đáp án B

(1) The protozoans, minute, aquatic creatures each of which consists of a single cell of protoplasm

Câu 3:

To which class of protozoans do the amoebae belong?

(A) Mastigophora

(B) Ciliata

(C) Sarcodina

(D) Motility

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Lời giải của GV VietJack

Đáp án C

(1) The Sarcodina, which include amoebae, float or row themselves about on their crusted bodies.

Câu 4:

What is the purpose of the large nucleus in the Ciliata?

(A) It generates the other nucleus.

(B) It contains the genetic code for the small nucleus.

(C) It regulates growth.

(D) It reproduces itself.

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Lời giải của GV VietJack

Đáp án C

(1) usually a large nucleus that regulates growth but decomposes during reproduction

Câu 5:

Why are protozoans classified as animals?

(A) They do not live on simple organic compounds.

(B) They collect in colonies.

(C) They respond uniformly to outside stimulate.

(D) They may have more than one cell.

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Lời giải của GV VietJack

Đáp án A

(1) Protozoans are considered animals because, unlike pigmented plants to which some protozoans are otherwise almost identical, they do not live on simple organic compounds

Câu 6:

The word “uniformly” in paragraph 4 is closest in meaning to

(A) in the same way

(B) once in a while

(C) all of a sudden

(D) in the long run

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Lời giải của GV VietJack

Đáp án A

Uniformly -> in the same way: theo cùng một cách

once in a while: thỉnh thoảng

all of a sudden: một cách bất ngờ

in the long run: sau cùng, rốt cuộc là

Câu 7:

The word “they” in paragraph 3 refers to

(A) protozoans

(B) microscopes

(C) investigations

(D) colonies

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Lời giải của GV VietJack

Đáp án A

(1) Protozoans are considered animals because, unlike pigmented plants to which some protozoans are otherwise almost identical, they (protozoans) do not live on simple organic compounds

Câu 8:

Which of the following statements are NOT true of protozoans?

(A) There are approximately 40,000 species.

(B) They are the most primitive forms of animal life.

(C) They have a large cell and a smaller cell.

(D) They are difficult to observe.

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Lời giải của GV VietJack

Đáp án C

A: (4) Nevertheless, with the current data available, almost 40,000 species of protozoans have been identified.

B: (1) The protozoans, minute, aquatic creatures each of which consists of a single cell of protoplasm, constitute a classification of the most primitive forms of animal life

D: (4) No doubt, as the technology improves our methods of observation, better models of classification will be proposed.

Bình luận

Câu 1:

It can be inferred from the passage that the Sun ___.

A. has been in existence for 10 billion years

B. is approximately halfway through its life as a yellow dwarf

C. will continue to be a yellow dwarf for another 10 billion years

D. is rapidly changing in size and brightness

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Câu 2:

With which of the following topics is the passage primarily concerned?

A. The Paleolithic period

B. Subsistence farming

C. Hunter-gatherers

D. Marginal environment

Xem đáp án » 11/09/2023 2,117

Câu 3:

What does the passage mainly discuss?

A. Advances in iron processing in the eighteenth and nineteenth centuries.

B. The effects of the Industrial Revolution on traditional architectural styles.

C. Advantages of stone and timber over steel as a building material.

D. The evolution of the use of iron in architecture during the 1800’s.

Xem đáp án » 09/05/2025 2,071

Câu 4:

What is the author’s main purpose in the passage?

A. To explain how Grace Bedell took a photograph of Abraham Lincoln

B. To explain why Abraham Lincoln wore a beard

C. To explain why the first photographs were significant in American life

D. To explain why Westfield is an important city

Xem đáp án » 11/09/2023 1,139

Câu 5:

Reading aloud was more common in the medieval world because .

A. few people could read to themselves

B. there were few places available for private reading

C. silent reading had not been discovered

D. people relied on reading for entertainment

Xem đáp án » 11/09/2023 1,008

Câu 6:

With what topic is this passage primarily concerned?

(A) Profits

(B) Rate

(C) Interest

(D) Principal

Xem đáp án » 11/09/2023 747