Free living nitrogen fixing takes place as shown in the following;

             TYPE                                                                                       N-FIXING GENERA

A) Cyanobacteria (blue-green algae)                                        i) Bacillus

B) Aerobic                                                                                     ii) Clostridium

C) Facultative                                                                              iii) Anabaena

D) Anaerobic nonphotosynthetic                                            iv) Rhodospirillum

E) Anaerobic photosynthetic                                                     v) Azospirillum

 Which of the following combination of free living nitrogen fixing bacteria is correct?

TLS Online TPP Program

#Question id: 40541

#Environmental Science

ASSERTION–REASON 

Assertion (A):Biomagnification is more pronounced in aquatic ecosystems.

Reason (R):Persistent organic pollutants are fat-soluble and resistant to biodegradation.

TLS Online TPP Program

#Question id: 40542

#Environmental Science

ASSERTION–REASON QUESTION

Assertion (A):Eutrophication leads to hypoxic conditions in water bodies.

Reason (R):Decomposition of algal biomass consumes dissolved oxygen.

TLS Online TPP Program

#Question id: 40543

#Environmental Science

ASSERTION–REASON QUESTION

Assertion (A):Ozone in the troposphere acts as a greenhouse gas.

Reason (R):Tropospheric ozone absorbs longwave radiation emitted by Earth.

TLS Online TPP Program

#Question id: 40544

#Environmental Science

Which of the following statements about noise pollution are correct?

1.Noise above 85 dB can cause permanent hearing loss

2.Traffic noise is categorized as occupational noise

3.Noise pollution can lead to hypertension

4.WHO recommends 55 dB as acceptable daytime noise level

TLS Online TPP Program

#Question id: 40545

#Environmental Science

Consider the following statements regarding thermal pollution:

1.It reduces dissolved oxygen levels

2.It accelerates metabolic rate of aquatic organisms

3.It always increases species diversity

4.It may cause thermal shock

TLS Online TPP Program

#Question id: 40546

#Environmental Science

Which statements are correct regarding particulate matter (PM2.5)?

1.Can penetrate deep into alveoli

2.Mainly emitted from natural forest fires only

3.Associated with cardiovascular diseases

4.Diameter is less than 2.5 µm

Choose the correct option: