Match the type of viruses in Column I with their typical genetic material in Column II.
Column I
Column II
A. Plant viruses
1. Free RNA of low molecular weight, lacking a protein coat
B. Animal viruses
2. Usually double-stranded DNA
C. Bacteriophages
3. Single-stranded RNA
D. Viroids
4. Single/double-stranded RNA or double-stranded DNA
Plant viruses usually possess ssRNA. Animal viruses may possess ssRNA, dsRNA or dsDNA. Bacteriophages are usually dsDNA viruses. Viroids are free low molecular weight RNA without a protein coat.
Question 262 of 300
📘 CLASS XI
Match the specific biological structures in Column I with their functions/descriptions in Column II.
Column I
Column II
A. Heterocyst
1. Small subunit that makes up the viral capsid
B. Gullet
2. A network of long, thread-like fungal hyphae
C. Capsomere
3. Specialised cell in cyanobacteria for fixing nitrogen
D. Mycelium
4. A cavity in ciliated protozoans to steer food-laden water
Heterocysts fix atmospheric nitrogen. The gullet directs food into Paramoecium. Capsomeres form the capsid. Mycelium is a network of fungal hyphae.
Question 263 of 300
📘 CLASS XI
Match the steps of the fungal sexual cycle in Column I with their definitions in Column II.
Column I
Column II
A. Plasmogamy
1. Fusion of two nuclei
B. Karyogamy
2. Fusion of protoplasms between two gametes
C. Meiosis
3. An intervening stage containing two nuclei per cell (n+n)
D. Dikaryophase
4. Reduction division in the zygote resulting in haploid spores
Plasmogamy is fusion of protoplasm, karyogamy is fusion of nuclei, meiosis produces haploid spores and dikaryophase contains two nuclei per cell.
Question 264 of 300
📘 CLASS XI
Match the Kingdoms in Column I with their cellular features in Column II according to Whittaker's classification.
Column I
Column II
A. Kingdom Monera
1. Cell wall mainly made of cellulose
B. Kingdom Protista
2. Cell wall composed of chitin and polysaccharides
C. Kingdom Fungi
3. Prokaryotic cells with noncellulosic cell walls
D. Kingdom Plantae
4. Eukaryotic, completely single-celled organisms
Match the Kingdoms in Column I with their cellular features in Column II according to Whittaker's classification. Column I
Monera are prokaryotic, Protista are unicellular eukaryotes, fungi possess chitinous cell walls and plants possess cellulosic cell walls.
Question 265 of 300
📘 CLASS XI
Match the specific fungi in Column I with their respective classes/features in Column II.
Column I
Column II
A. Albugo
1. Deuteromycetes (Imperfect fungi)
B. Saccharomyces
2. Basidiomycetes (Mushroom)
C. Agaricus
3. Unicellular Ascomycetes (Yeast)
D. Colletotrichum
4. Phycomycetes (Parasitic fungus on mustard)
Match the specific fungi in Column I with their respective classes/features in Column II.
Albugo is a phycomycete, Saccharomyces is a unicellular ascomycete, Agaricus is a basidiomycete and Colletotrichum belongs to Deuteromycetes.
Question 266 of 300
📘 CLASS XI
Match the symbiotic terms in Column I with their correct descriptions in Column II.
Column I
Column II
A. Phycobiont
1. The heterotrophic fungal component that provides shelter
B. Mycobiont
2. The autotrophic algal component that prepares food
C. Lichens
3. Fungal association with the roots of higher plants
D. Mycorrhiza
4. Excellent environmental pollution indicators
Phycobiont is the algal partner, mycobiont is the fungal partner, lichens indicate pollution and mycorrhiza is a root-fungus association.
Question 267 of 300
📘 CLASS XI
Match the Kingdom characteristics in Column I with their associations in Column II.
Column I
Column II
A. Alternation of generations
1. Stored food reserve in Animalia
B. Glycogen or fat
2. Cycle of sporophytic and gametophytic phases in Plantae
C. Coenocytic hyphae
3. Formed by indestructible cell walls of Chrysophytes
D. Diatomaceous earth
4. Continuous tubes filled with multinucleated cytoplasm in Fungi
Alternation of generations occurs in plants, glycogen/fat is stored in animals, coenocytic hyphae are multinucleate fungal hyphae and diatomaceous earth is formed from diatoms.
Question 268 of 300
📘 CLASS XI
Match the type of fungal spores in Column I with their production methods in Column II.
Column I
Column II
A. Zoospores
1. Asexual spores produced exogenously
B. Conidia
2. Sexual spores produced exogenously
C. Ascospores
3. Sexual spores produced endogenously in sac-like structures
D. Basidiospores
4. Asexual spores that are motile
Zoospores are motile, conidia are exogenous asexual spores, ascospores are endogenous sexual spores and basidiospores are exogenous sexual spores.
Question 269 of 300
📘 CLASS XI
Match the organisms in Column I with the structural nature of their outer covering in Column II.
Column I
Column II
A. Diatoms
1. Stiff cellulose plates on the outer surface
B. Dinoflagellates
2. Overlapping shells embedded with indestructible silica
C. Euglenoids
3. Completely lack a cell wall
D. Kingdom Animalia
4. Protein-rich layer (pellicle) making the body flexible
Diatoms possess silica walls, dinoflagellates have cellulose plates, euglenoids lack a cell wall and possess a pellicle, while animal cells lack cell walls.
Question 270 of 300
📘 CLASS XI
Match the ecological/economic roles in Column I with the correct organisms in Column II.
Column I
Column II
A. Methanogens
1. Chief producers in the oceans
B. Chemosynthetic autotrophic bacteria
2. Decomposers of litter that help in mineral cycling
C. Diatoms
3. Production of biogas from dung
D. Deuteromycetes
4. Recycling crucial nutrients like nitrogen, phosphorous, iron and sulphur
Methanogens produce biogas. Chemosynthetic bacteria recycle nutrients. Diatoms are chief producers in oceans. Deuteromycetes are important decomposers.
