Match the specialized structures/enzymes with the corresponding nitrogen fixer:

List-I (Structure/Enzyme)	List-II (Microorganism)
(A). Heterocyst	(I). Rhizobium
(B). Leghaemoglobin	(II). Anabaena
(C). Respiratory Protection	(III). Clostridium
(D). Anaerobic N-fixation	(IV). Azotobacter

TLS Online TPP Program

#Question id: 40518

#Environmental Science

Which statements are true about taxonomic hierarchy?

1.Kingdom is highest rank

2.Genus contains related species

3.Family includes multiple genera

4.Species is broadest rank

TLS Online TPP Program

#Question id: 40519

#Environmental Science

Identify correct statements about species concept:

1.Biological species concept uses reproductive isolation

2.Morphological species concept relies on appearance

3.All species concepts give identical results

4.Species are evolutionary units

TLS Online TPP Program

#Question id: 40520

#Environmental Science

Which statements about phylogenetic classification are correct?

1.Based on evolutionary history

2.Uses molecular data

3.Ignores morphology

4.Reflects common ancestry

TLS Online TPP Program

#Question id: 40521

#Environmental Science

ASSERTION–REASON

Assertion (A): Numerical taxonomy uses many observable characters.

Reason (R): It reduces subjectivity in classification.

TLS Online TPP Program

#Question id: 40522

#Environmental Science

ASSERTION–REASON

Assertion (A): Cytotaxonomy helps identify evolutionary relationships.

Reason (R): Chromosome number and structure vary among taxa.

TLS Online TPP Program

#Question id: 40523

#Environmental Science

Match the classification approach with its core principle

Column I	Column II
A. Cladistics	1. Shared derived characters
B. Phenetics	2. Overall similarity scoring
C. Evolutionary taxonomy	3. Ancestry + degree of divergence
D. Biosystematics	4. Population-level variation