(c) Viruses cannot be grown in culture medium.
(d) Prions possess only nucleoid and no protein.- Select the mismatched pair.
(a) Polio virus – Enders
(b) Crystallised TMV – Stanley
(c) Prions – Diener
(d) Retrovirus – Temin
Match The Columns - Match Column I with Column II.
Column I Column II
A. Nostoc (i) Pleomorphic
B. Alternaria (ii) Drosophila of Plant Kingdom
C. Mycoplasma (iii) Star jelly
D. Neurospora (iv) Imperfect fungi - Match Column I with Column II. (There can be more than
one match for items in Column I).
Column I Column II
A. Purple bacteria (i) Thiopedia
B. Pathogenic bacteria (ii) Cleaning agents in
tooth paste
C. Diatomite (iii) Industrial catalyst
D. Antibiotics (iv) Xanthomonas citri
(v) Streptomyces
(vi) Rhodopseudomonas
(vii) Agrobacterium
tumefaciens
(viii) Bacillus
Passage Based Questions
18.(A) Complete the given passage with appropriate words or
phrases.
Mycoplasmas are the simplest and (i) of the free living
prokaryotes classified under Kingdom (ii). They were
discovered in (iii) of cattle suffering from (iv). The size
ranges from (v) disease. The genetic material is represented
by (vi) which is naked because of absence of (vii). They
are (viii) in their nutrition. They mostly cause (ix) disease
in humans and (x) disease in brinjal plant.
(B) Read the given passage and correct the errors, wherever
present.
Sclerotia and rhizomorphs are the means of sexual
reproduction in fungi. Rhizomorphs are perennating bodies
made up of compact masses of hyphae whereas sclerotia are
rope-like twisted subterranean masses of hyphae. Vegetative
reproduction in fungi occurs through spores. The sexually
produced spores are called mitospores,e.g., basidiospores,
conidia, etc. The phenomenon of having two genetically
similar and compatible sexual strains in same thalli is known
as heterothallism.
Assertion & Reason
In each of the following questions, a statement of Assertion (A)
is given and a corresponding statement of Reason (R) is given
just below it. Of the statements, mark the correct answer as :
(a) if both A and R are true and R is the correct explanation of A
(b) if both A and R are true but R is not the correct explanation
of A
(c) if A is true but R is false
(d) if both A and R are false.- Assertion : Deuteromycetes is commonly called imperfect
fungi.
Reason : In deuteromycetes, only asexual or vegetative
phase is known. - Assertion : Archaebacteria are able to survive in harsh
habitats.
Reason : Presence of peptidoglycan in cell wall helps
archaebacteria to survive in extreme conditions. - Assertion : Diatoms are called ‘jewels of the plant
kingdom’.
Reason : Silica wall of diatoms is characterised by fine
ridges, lines, pores etc. - Assertion : Individuals of Subphylum Sporozoa lack
locomotory organelles.
Reason : All sporozoa are parasites. - Assertion : Viroids are small infectious RNA particles
which are devoid of protein coat.
Reason : Viroids contain more than 900 nucleotides
and do not contain any genes. - Assertion : Euglenoids pile up at the bottom of water
reservoirs and form big heaps called diatomite.
Reason : The reserve food material of euglenoids is in
the form of volutin globules. - Assertion : Hopanoids are pentacyclic sterols found in
plasma membrane of some bacteria.
Reason : Hopanoids stabilise the plasma membrane. - Assertion : Ascomycetes are commonly known as sac-
fungi.
Reason : Sexual spores of ascomycetes are produced
endogenously in sac-like asci. - Assertion : In lichens, mycobiont and phycobiont are
symbiotically associated with each other.
Reason : Mycobiont provides food and phycobiont
provides anchorage and absorption of water and minerals. - Assertion : Some dinoflagellates such as Gymnodinium
cause red tide.
Reason : Dinoflagellates are photosynthetic protists and
mostly marine.