有关生态系统结构的叙述正确的是()。

2023-08-04

A.硝化细菌是自养生物，但不能进行光合作用
B.河流中所有生物和底泥共同组成河流生态系统
C.食物链中营养级越高的生物，其体型必然越大
D.我国南方热带雨林中分解者的代谢活动比北方森林中的弱

参考答案：A

硝化细菌为自养生物，不含叶绿素等光合色素，不能进行光合作用．但可以利用硝化作用合成有机物，A项正确。在一定区域内，生物与环境所形成的统一整体叫生态系统．而河流生态系统的环境组成不仅仅是底泥，还有水、空气等，B项错误。食物链中营养级越高的生物，体型不一定越大．如人的营养级比猪高，但体型比猪小，C项错误。我国南方热带雨林温度较高，分解者的代谢活动比北方森林中的强．D项错误。

相关推荐

To teach students writing effectively, teachers may guide students through the writing process as follows:① mapping② editing ③outlining④ brainstorming⑤free writing⑥drafting

2023-08-04 从业资格教师从业资格

In English teaching, teachers should NOT pay attention to__________.

2023-08-04 从业资格教师从业资格

Much of the debate on an ongoing society in China has focused on the extended families__________ the number of "empty-nets" is growing by the millions every year.

2023-08-04 从业资格教师从业资格

The ambiguity in "My friend drove me to the bank." is caused by__________.

2023-08-04 从业资格教师从业资格

When a lady customer intends to buy a coat with white stripes, what is she supposed to_______place an emphasis on if she says to the shop assistant?

2023-08-04 从业资格教师从业资格

Which of the following can NOT be regarded as a feature of successful English teacher?

2023-08-04 从业资格教师从业资格

Decide on the correct stress pattern of the answer to the question:Where did he go next?_______

2023-08-04 从业资格教师从业资格

When a student has made a sentence "I borrowed a paper from Miss Li", the teacher says," Do you mean 'a piece of paper'?" Here the teacher is playing the role of a(n)

2023-08-04 从业资格教师从业资格

At a higher level of writing, which of the following cognitive skills should NOT be encouraged?

2023-08-04 从业资格教师从业资格

When checking students' understanding of a certain language point in class, which of the following utterances is a teacher expected to make?

2023-08-04 从业资格教师从业资格

热门标签