Prokaryotes are the most primitive organisms on Earth. They do not have a proper nucleus. The genetic material is not enclosed within a nuclear membrane. The genetic materials lie in the cytoplasm to form a region called nucleoid (nucleus-like).Hence, the correct option is B.

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Biological Classification

Q: In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea?

The archaebacteria are placed in a different kingdom from the plants and animals. The archaebacteria are the organisms that have certain properties which are not common to the organisms placed in bacteria and eukarya. The group contains methanogens that can produce methane gas. The DNA of these organisms is generally present in a relaxed state or as positively coiled. The cell wall of these organisms does not contain lipids, peptidoglycan, etc. Thus, the correct answer is option D.

Q: When a bacterium is provided with flagella arising from two opposite ends, it is called

The flagella is an elongated filament-like structure which allows the bacteria to move or show locomotion. There are different types of bacteria which are classified on the basis of the presence and number of flagella around the cell. When the flagella is present at both the opposite ends of the bacterium, they are known as amphitrichous. Thus, the correct answer is option C.

Q: Association in a lichen is _______.

Lichens are formed due to a kind of symbiotic relationship between fungi and cyanobacterium (blue-green algae). The relationship is obligatory in nature they produce their own food by photosynthesis (algal partner helps in this process) but also use the plant or other substance on which they grow as the substrate for other nutrients (fungal partner helps in this process of collection of moisture and nutrients). An obligatory relationship is one in which one or both the partners get benefits. So, the correct answer is 'obligatory'.

Q: An example of iron oxidizing bacteria is

Ferrobacillus oxidizes ferrous ions to ferric ions for producing energy.Hence the correct option is C.

Q: Organisms called methanogens are most abundant in a

A) Correct option C B) Explanation for the correct option:Methanogens can be found in the intestines of ruminants such as cows and buffaloes, and they generate methane from their dung. These bacteria have the ability to produce methane, marshland gas, or biogas. Thus, they are found abundantly in cattle yards.

Q: The algal component of lichen is known as:

The algal component of a lichen is known as photobiont or phycobiont. The fungal component is known as mycobiont. Lichens are composite organisms that show the symbiotic association between algae and fungi.So, the correct answer is 'Phycobiont and Photobiont'.

Q: The scientist who created the group Protista for both unicellular plants and animals is:

Protista was first observed by John Hogg in 1860. This kingdom was known as Kingdom 'Protoctista' at that time and consisted of unicellular plants and animals. In 1866 Ernst Haeckel coined the term 'Protista' for them.Thus, the correct answer is option A.

Q: Which of the following scientist has made a significant contribution in the field of classification?

Linnaeus

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Biological Classification

Biology 4214 Views

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea?

Prokaryotes have:

When a bacterium is provided with flagella arising from two opposite ends, it is called

Association in a lichen is _______.

An example of iron oxidizing bacteria is

Organisms called methanogens are most abundant in a

Which of the following is considered as neither prokaryotes nor eukaryotes?

The algal component of lichen is known as:

The scientist who created the group Protista for both unicellular plants and animals is:

Which of the following scientist has made a significant contribution in the field of classification?

Biology
4214 Views