CBSE Class 11 Biology Biological Classification Worksheet Set A

Question. The symbiotic relationship of algae and fungus is found in 
(a) lichen
(b) mycorrhiza
(c) pneumatophore
(d) bacteriophage
Answer. A

Question. The virus that infects bacteria is called 
(a) cyanophage
(b) mycophage
(c) bacteriophage
(d) none of these
Answer. C

Question. Citrus canker is caused by 
(a) bacterium
(b) fungus
(c) alga
(d) virus
Answer. A

Question. Which of the following is a cyanobacterium ?
(a) Nostoc
(b) Chara 
(c) E. coli
(d) Polysiphonia
Answer. A

Question. Virus has
(a) DNA
(b) RNA
(c) both (a) and (b)
(d) either DNA or RNA
Answer. D

Question. Hormogonia are vegetative reproductive structure of 
(a) Spirogyra
(b) Ulothrix
(c) Oscillatoria
(d) Yeast
Answer. C

Question. Which is a unicellular fungus ?
(a) Yeast
(b) E.coli
(c) Nostoc
(d) Albugo
Answer. A

Question. Bacterial cell wall is made up of 
(a) xylan
(b) chitin
(c) cellulose
(d) murein
Answer. D

Question. Cell wall is absent in 
(a) Amoeba
(b) Chara
(c) yeast
(d) E. coli
Answer. A

Question. Which of the following is a fungus? 
(a) Nostoc
(b) E. coli
(c) Yeast
(d) Chara
Answer. C

Question. Powdery mildews of crops are caused by
(a) bacteria
(b) ascomycetes
(c) basidiomycetes
(d) phycomycetes
Answer. B

Question. Pullorum disease of poultry is caused by 
(a) Mycobacterium
(b) Salmonella
(c) Clostridium
(d) Haemophilus
Answer. B

Question. Viroids have 
(a) single stranded RNA not enclosed by protein coat.
(b) single stranded DNA not enclosed by protein coat.
(c) double stranded DNA enclosed by protein coat.
(d) double stranded RNA enclosed by protein coat.
Answer. A

Question. Myxomycetes are 
(a) saprobes or parasites, having mycelia,asexual reproduction by fragmentation.
(b) slimy mass of multinucleate protoplasm, having pseudopodia like structures for engulfing food, reproduction through fragmentation or zoospores.
(c) prokaryotic organisms, cellular or acellular, saprobes or autotrophic, reproduce by binary fission.
(d) eukaryotic, single-celled or filamentous, saprobes or autotrophic, asexual reproduction by division of haploid individuals, sexual reproduction by fusion of two cells or their nuclei.
Answer. B

Question. Among rust, smut and mushroom all the three
(a) are pathogens
(b) are saprobes
(c) bear ascocarps
(d) bear basidiocarps
Answer. D

Question. "Fairy rings" in lawns result from outward,spreading circles of mycelia of mushrooms producing, at their periphery, fruiting bodies called 
(a) ascocarps
(b) basidiocarps
(c) sorocarps
(d) pseudocarps
Answer. B

Question. Which one of the following statements is correct? 
(a) Prions are the smallest free-living cells.
(b) The cell wall of Mycoplasmas is made up of amino sugars.
(c) Viroids consist of single-stranded RNA molecule.
(d) Rickettsiae lack cell wall.
Answer. C

Question. Bacterial cell wall is composed of peptidoglycan, a complex of oligosaccharides and proteins. The oligosaccharide component consist of [2010]
(a) linear chain of alternating NAG and NAM linked by α (1 – 4) linkage.
(b) linear chains of alternating NAG and NAM linked by β (1 – 4) linkage.
(c) linear chain of glucose linked by β (1 – 4) linkage.
(d) linear chain of glucose linked by α (1 – 4) likage
Answer. B

Question. Which pair of the following belongs to Basidiomycetes?
(a) Puffballs and Claviceps
(b) Peziza and Alternaria
(c) Morchella and mushrooms
(d) Birds nest fungi and puffballs
Answer. D

Question. Match column-I with column-II and select the option . 
Column-I                          Column-II
(Classes of fungi)       (Common name)
A. Phycomycetes        I. Sac fungi
B. Ascomycetes         II. Algal fungi
C. Basidiomycetes     III. Fungi imperfecti
D. Deuteromycetes    IV. Club fungi
The correct combination is –
(a) A – II; B – I; C – IV; D – III
(b) A – II; B – IV; C – I; D – III
(c) A – IV; B – I; C – II; D – III
(d) A – IV; B – III; C – II; D – I
Answer. A

Question. Which of the following is correct about the slime mould ? 
(i) Its thalloid body, Plasmodium has pseudopodia for locomotion and engulfing organic matter.
(ii) During unfavourable conditions Plasmodium differentiates and produces fruiting bodies, sporangium.
(iii) Spores posses no true cell wall.
(iv) They are dispersed by air current.
(v) Being extremely resistant, spores survive for many years.
(vi) Plasmodium can grow upto several feet.
Choose the answer from the following options
(a) (i),(ii), (iv), (v) and (vi)
(b) (i),(ii) and (iii)
(c) (i),(ii), (iii) and (vi)
(d) (ii),(iii) and (vi)
Answer. A

Question. (i) Green algae occur in fresh water, brackish water, salt water.
(ii) Habitat of Brown algae-fresh water (rare), brackish water, salt water
(iii) Some red algae are found in fresh water, mostly occur in salt water, some are in brackish water.
(iv) Most of the red algae are multicellular.
(v) Red alga may occur in both well lighted regions close to water-surface and also at great depths in oceans where light penetration is little. (vi) Cell wall of red algae consists of cellulose + agar.
(vii) 2 – 8, equal and apical flagella in green algae 
(a) All are correct
(b) All are false
(c) (i) and (vi) are correct
(d) (ii), (iii) and (v) are correct
Answer. A

Question. Fungi are filamentous with the exception of "X" which is unicellular. Identify X.
(a) Yeast
(b) Albugo
(c) Mucor
(d) Lichen
Answer. A

Question. Which of the following statements is not correct for viruses? 
(a) Viruses are obligate parasites.
(b) Viruses can multiply only when they are inside the living cells.
(c) Viruses cannot pass through bacterial filters.
(d) Viruses are made up of protein and DNA or RNA (never both DNA and RNA).
Answer. C

Question. Which of the following statements regarding cyanobacteria is incorrect? 
(a) It is also called blue green algae.
(b) They are chemosynthetic heterotrophs.
(c) It forms blooms in polluted water bodies.
(d) It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Answer. B