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Question 31 Mark
What are the modes of locomotion found in protists?
Answer
Wriggling, cilia, mucilage propulsion, pseudopodia.
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Question 61 Mark
Which bacteria live inside human body without causing any harm?
Answer
Treponema denticola, Torale, Staphylococcus aureus and Escherichia coll. They are called coliforms.
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Question 71 Mark
Name the domains in the three-domain classification, which include prokaryotes.
Answer
Archaea and Bacteria.
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Question 81 Mark
How the Aristotle divided animals into two groups?
Answer
Aristotle divided animals in two groups. These are Enaima (with red blood) and Anaima (without red blood).
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Question 111 Mark
Who proposed the two kingdom classification?
Answer
Linnaeus proposed the two kingdom classification in 1758.
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Question 131 Mark
Name the sexual spores produced by the sac fungi. Name the structure in which they are formed.
Answer
Ascospores; they are formed in asci (ascus-singular).
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Question 141 Mark
Give the name of a fungus which causes rust diseases.
Answer
Puccinia graminis tritici causes black stem rust of wheat.
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Question 151 Mark
Mention any two types of each of:
  1. Asexual spores.
  2. Sexual spores, produced by fungi.
Answer
  1. Aplanospores.
  2. Conidia.
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Question 161 Mark
Fill in the blanks (A) and (B) Classification proposed by Whittaker includes:.Monera,
  1. Fungi.
  2. Animalia.
Answer
  1. Protista.
  2. Plantae.
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Question 171 Mark
Differentiate between chrysophytes and dinoflagellates.
Answer
S.No.
Chrysophytes
Dinoflagellates
1.
They are the planktons that passively float on the surface of water.
They have two flagella for locomotion.
2.
Silica is deposited on the cellulosic cell wall
Silica is not found in the cell walls.
3.
Cell wall occurs as two thin overlapping shells that fit together as in a soap box.
Cell wall occurs as stiff plates on the outer surface.
4.
They do not release any toxins.
They release some toxin, which kill fish populations.
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Question 181 Mark
What is retting of fibres? Name a bacterium involved in it.
Answer
The separation of fibres from soft tissue is called retting of fibres, e.g., jute, flax. Bacterium used for this is Pseudomonas fluoroscens.
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Question 191 Mark
Mention two features in which the slime moulds resemble animals.
Answer
  1. They have no cell wall.
  2. They engulf/ingest organic food material.
  3. They exhibit amoeboid movement.
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Question 201 Mark
What is capsid and how is it useful for viruses?
Answer
Capsid is a proteinaceous covering around the virus. It protects the nucleoid from damage from physical and chemical agents.
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Question 211 Mark
List two important features of Gonyaulax.
Answer
Gonyaulax are important because:
  1. They have red coloured pigments present in their cells make the sea glow red. They are called red tides.
  2. They produce toxins such as saxitoxin that kills the fish.
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Question 221 Mark
Name the scientist who showed that
  1. viruses could be crystallised.
  2. viruses are smaller than bacteria.
Answer
  1. W.M. Stanley.
  2. M.W. Beijerinek.
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Question 231 Mark
What technical term is given to the symbiotic association of fungi with:
  1. Algae.
  2. Roots of higher plants, respectively?
Answer
  1. Lichen.
  2. Mycorrhizae.
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Question 241 Mark
What is a dikaryon?
Answer
It is a cell in certain fungi in which two genetically different nuclei are present after plasmogamy.
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Question 251 Mark
What is diatomaceous earth? Mention any two economic uses of it.
Answer
Diatomaceous earth refers to the deposits of the nearly indestructible siliceous cell wall of diatoms in the ocean floor.
  • It is used in filtration of oils and syrups.
  • It is used in polishing of metals.
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Question 261 Mark
Why two kingdom classification continued to be used for a long time?
Answer
Classification of organisms into plants and animals was easily done and was easy to understand.
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Question 271 Mark
Write one similarity and one difference between zoospores and aplanospores.
Answer
  • Both are formed within the sporangia.
  • Zoospores are motile and aplanospores are non motile.
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Question 291 Mark
Which are the most advanced group of fungi?
Answer
Basidiomycetes (the club fungi) are the most advanced and most commonly seen fungi.
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Question 311 Mark
In which kingdom of five kingdom classification, nuclear membrane is not present?
Answer
Bacteria are prokaryotes which belong to kingdom-Monera. Monerans do not have nuclear membrane enclosing the nucleus of the cell.
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Question 331 Mark
Mention any two cellular structures absent in kingdom-Animalia of four kingdom classification system of organisms that are present in kingdom-Protista.
Answer
Cell wall and chloroplasts are absent in cells of members of kingdom-Animalia.
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Question 341 Mark
Why are viruses called nucleoproteins?
Answer
Because viruses are composed of a nucleic acid (either DNA or RNA) and a protein coat capsid.
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Question 351 Mark
Who is credited with the discovery of viruses? Name the virus he discovered.
Answer
D.I. Ivanowsky discovered tobacoo mosaic virus.
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Question 361 Mark
Which enzyme is present in bacteriophages?
Answer
Lysozyme is present in the region that comes in contact with host cell.
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Question 381 Mark
How the saprotrophic Basidiomycetes are able to decompose plant matter?
Answer
The saprotrophic Basidiomycetes can decompose plant matter because they have enzymes for metabolising both cellulose and lignin.
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Question 391 Mark
Why the pseudoparenchyma fungal tissue is called false parenchyma?
Answer
This is because pseudoparenchyma is formed by close packing, and fusion of hyphae. Individual hyphae are not distinguishable.
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Question 411 Mark
Give the name of causative agents of these diseases.
  1. Cholera.
  2. Typhoid.
Answer
  1. Cholera: Vibrio cholerae.
  2. Typhoid: Salmonella typhii.
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Question 441 Mark
Flagellar locomotion can be observed in which protistans?
Answer
Euglena, dinoflagellates and zooflagellates.
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Question 471 Mark
As per the three-domain system of classification, human can be kept under which domain?
Answer
Eukaryota.
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Question 481 Mark
What are the types of mycorrhiza?
Answer
Mycorrhiza can be of two types:
  1. Ectomycorrhiza.
  2. Endomycorrhiza.
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Question 491 Mark
Mention two features in which deuteromycetes resemble ascomycetes.
Answer
  1. Members of both the classes have septate and branched mycelia.
  2. They reproduce asexually by conidia formation.
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Question 501 Mark
Mention the two events which occur in a basidium, as soon as it is formed.
Answer
Karyogamy and meiosis occur in a basidium, as soon as it is formed.
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1 Marks Question - BIOLOGY STD 11 Science Questions - Vidyadip