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BIOLOGY 1 Marks Question

Biological Classification · MP Board (MPBSE) STD 11 Science (Madhya Pradesh - English Medium). 122 questions.

Questions · Page 3 of 3

1 Marks Question

Question 1011 Mark
Gamete formation and fusion are absent in bacteria. How do then bacteria undergo sexual reproduction?
Answer
It occurs by conjugation. It involves transfer of genetic material from one bacterium to another through cell to cell contact.
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Question 1031 Mark
Name the kingdom under which cyanobacteria have been classified.
Answer
Cyanobacteria are prokaryotic organisms belonging to kingdom-Monera.
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Question 1041 Mark
Why are most fungi referred to as saprotrophs?
Answer
They are referred to as saprotrophs because they are heterotrophs and absorb soluble organic matter from the dead and decaying organic substrates.
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Question 1061 Mark
A fungal cell with two genetically different nuclei formed after is called a dikaryon.
Answer
Plasmogamy.
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Question 1071 Mark
What do you understand by three domains of life?
Answer
As per three-domain system; living beings are divided into three domains, viz. Archaea, Bacteria and Eukaryota.
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Question 1081 Mark
Which of the organisms are called jewels of the plant world? Elaborate about them.
Answer
Diatoms are called the jewels of the plant kingdom because of cell wall ornamentation and presence of golden brown chromatophores. There are two types of diatoms, i.e., the pennate diatom and centric diatom. Pennate diatoms are like small rectangular soap boxes. Centric diatoms are circular.
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Question 1091 Mark
Why are cysts formed in protistans?
Answer
Cysts formation helps to overcome unfavourable condition for reproduction.
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Question 1101 Mark
Give one evidence to show that viruses are smaller than bacteria.
Answer
Viruses pass through the bacteria-proof filters.
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Question 1121 Mark
What is the body organisation in members of Kingdom-Animalia?
Answer
Body organisation in members of Kingdom-Animalia is cellular, tissue, organ and organ system level.
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Question 1141 Mark
Why do mosquito bites cause itching?
Answer
When female mosquitoes like Anopheles, suck human blood, it simultaneously injects a poisonous liquid containing the protozoan cells into our blood. This poison causes the itching and causes swelling of the area.
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Question 1161 Mark
Who gave the term'virus'? What does the word 'virus' mean?
Answer
  • Louis Pasteur gave the term 'virus'.
  • It means venom or poisonous fluid.
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Question 1181 Mark
Name the following:
  1. The domain in three-domain system of classification, Which includes Kingdoms, Fungi, Plantae and Animalia.
  2. The photosynthetic pigment common to cyanobacteria and green plants.
  3. A moneran that lacks cell wall.
  4. The characterisitic type of nutrition in animals.
  5. The chemical nature of fungal cell wall.
Answer
  1. Eukarya.
  2. Chlorophyll.
  3. Mycoplasma.
  4. Holozoic.
  5. Chitin.
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Question 1191 Mark
The two gametangia come in contact and fuse to form a zygote in which event? Give two examples.
Answer
Gametangial copulation, e.g., Rhizopus, Mucor, etc.
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Question 1201 Mark
Give two reasons why fungi have been removed from plant kingdom and placed as a separate kingdom.
Answer
  1. The cell wall of fungi is made of chitin, while that of plants is made of cellulose.
  2. All fungi are heterotrophs and non-chlorophyllous while all plants are autotrophs and chlorophyllous.
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Question 1211 Mark
Mark the odd one in the following groups. Entamoeba, Trypanosoma, Gonyaulax, Plasmodium.
Answer
Gonyaulax.
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Question 1221 Mark
Why virus cannot grow on non-living culture medium?
Answer
A virus cannot grow on non-living culture medium because it needs living cells for its metabolism and multiplication.
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1 Marks Question - Page 3 - BIOLOGY STD 11 Science Questions - Vidyadip