Select the correct combinations or statements w.r.t. characteristics of certain organisms.
(A) Methanogens are archaebacteria which produce methane in marshy areas.
(B) Nostoc is a filamentous green algae which fixes atmospheric nitrogen.
(C) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(D) Mycoplasma lacks a cell wall and pathogenic to plant as well as animal.
a)
A, B, C and D
b)
A, B and D
c)
C and D
d)
A and D
Correct answer is option 'D'. Can you explain this answer?

Question

Select the correct combinations or statements w.r.t. characteristics of certain organisms.

(A) Methanogens are archaebacteria which produce methane in marshy areas.
(B) Nostoc is a filamentous green algae which fixes atmospheric nitrogen.
(C) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(D) Mycoplasma lacks a cell wall and pathogenic to plant as well as animal.

a)
A, B, C and D
b)
A, B and D
c)
C and D
d)
A and D

Correct answer is option 'D'. Can you explain this answer?

Answer

Refer ncert you will better understand if you read all ncert lines thoroughly.

Answer

Before  implantation  fertilisation required,  when  CuT used  increased phagocytes of the sperm, decreased motility there for  decreased fertilisation capacity of sperm so prevent fertilisation  ,no implantation

Answer

The correct combination of statements with respect to characteristics of certain organisms is option 'D', which includes statements A and D. Let's understand each statement in detail:

(A) Methanogens are archaebacteria which produce methane in marshy areas:
Methanogens are a group of microorganisms belonging to the domain Archaea. They are anaerobic bacteria that produce methane as a metabolic byproduct during their energy production process. Methanogens are commonly found in anaerobic environments, such as marshy areas, swamps, and the digestive systems of animals like cows and termites. They play an essential role in the carbon cycle by converting organic matter into methane gas.

(D) Mycoplasma lacks a cell wall and is pathogenic to plants as well as animals:
Mycoplasma is a genus of bacteria that are unique in that they lack a cell wall. The absence of a cell wall gives them a pleomorphic shape, allowing them to take on various forms. Mycoplasma species can be pathogenic to both plants and animals, causing diseases such as pneumonia, urinary tract infections, and respiratory infections. They are known for their small size and ability to pass through filters that can capture most bacteria.

Statement B is incorrect:
(B) Nostoc is a filamentous green algae that fixes atmospheric nitrogen:
Nostoc is not a green algae, but a type of cyanobacteria. Cyanobacteria are often referred to as blue-green algae, but they are not true algae. Nostoc is a filamentous cyanobacterium that forms colonies or mats in various environments like soil, freshwater, and marine habitats. It is capable of nitrogen fixation, which means it can convert atmospheric nitrogen into a form that can be used by plants and other organisms. Nitrogen fixation is an important ecological process that contributes to the availability of nitrogen in the soil.

Statement C is incorrect:
(C) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose:
Chemosynthetic autotrophic bacteria are capable of synthesizing organic compounds using energy derived from chemical reactions instead of sunlight. However, they do not synthesize cellulose from glucose. Cellulose is a complex carbohydrate that serves as a structural component in the cell walls of plants and some other organisms. The synthesis of cellulose is primarily carried out by plants, algae, and some bacteria, but not by chemosynthetic autotrophic bacteria.

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