Question

20
are important decomposers that cause decay and decomposition of dead bodies of plants and animals.
(d) Both (a) and (b)
(a) Saprotrophic bacteria (b) Saprotrophic fungi (@) Earthworm
21. Which of the following statements is incorrect?
(a) Pathogenic bacteria cause 90% of human diseases.
(b) A large number of antibiotics are produced by Actinomycetes (e.g, Streptomyces), which are a class of Fungi.
(C) Ny-fixing bacteria pick up free N, from soil atmosphere and convert it into nitrogenous compounds.
(d) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible to
in extreme conditions.
22.
(d)
all of these.
Photosynthetic pigments of Cyanobacteria (blue green algae) include
(a) chlorophylla (b) carotenes
(c) xanthophylls
23 Cyanobacteria are used in agricultural fields for crop improvement because they cause
(a) N2 fixation
(b) algal blooms
(c) photosynthesis
(d)
all of these.
Select the correct statement regarding heterocysts.
(a) These are present in some filamentous cyanobacteria such as Nostoc and Anabaena.
(b) These cells are specialized to perform N2-fixation.
(c) These cells contain enzyme nitrogenase.
(d) All of these.
25. Select the correct option that correctly identifies the different genera (A, B, C and D) of kingdom Fungi shown in
B
D
(a) Mucor
Saccharomyces
Morchella
Amanita​

Answer 1

Answer:

2O saprotrophic bacteria