Questions

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17 questions · timed · auto-graded

Question 11 Mark
How do preparation like yoghurt, idli, dosa become easy to digest?
Answer
Fermentation does detoxification and splits complex carbohydrates and proteins into simple ones. Thus, making it easy to digest.
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Question 21 Mark
Can the point of a needle accommodate micro-organism?
Answer
Yes, they are smaller than the point of a needle.
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Question 31 Mark
How are cells protected?
Answer
  1. Plant cells are protected due to presence of cell wall.
  2. Animal cells are protected by the double plasma membrane.
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Question 41 Mark
How do the cells acquire definite shapes?
Answer
The cells acquire definite shapes due to the presence of cell wall.
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Question 51 Mark
What are the black or white spots sometimes seen on gunny bags?
Answer
These spots are the growth of many microbes such as fungi, mucus, mold, etc.
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Question 61 Mark
Take a drop of yoghurt or buttermilk on a glass slide and observe it under a compound microscope.
Answer
  1. I will see Lactobacillus rod shapted bacteria and streptococcus spherical shape bacteria which may be in clusters.
  2. Lactobacillus use lactose present in the milk and produce lactic acid which gives tangy taste to yoghurt.
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Question 71 Mark
Observe a drop of muddy water or water from a stagnant puddle, under the compound microscope.
Answer
  1. We will observe, living things, micro-organism, bacteria, fungi.
  2. It will be swarming withbacteria,paramoecium, amoeba, ciliated bacteria and protozoa, etc.
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Question 81 Mark
Keep a moistened piece of bread or bhakari in a closed box. What will you observe after 3-4 days?
Answer
  1. I will observe growth of fungus or mucor. White cotton like layer or black spots.
  2. As we know fungus grows in presence of moisture.
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Question 91 Mark
Which are the different types of micro-organisms?
Answer
Algae, fungi, bacteria, protozoa and viruses are various types of micro-organism. Some are unicellular and others are multicellular. Some of them are useful and some are harmful.
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Question 101 Mark
What are micro-organisms?
Answer
The organisms which cannot be seen with our eyes but can only be observed under a microscope are called micro-organisms.
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Question 111 Mark
Name the different organelles in a cell.
Answer
The nucleus, endoplasmic reticulum, Golgi bodies, lysosomes, mitochondria, vacuoles, plastids, chloroplasts are the different organelles in a cell.
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Question 131 Mark
What do micro-organisms need for growth?
Answer
Micro-organisms need soil, water and decaying material. Temperature suitable for microbial growth is 15 to 35°C moist, humid and warm climate.
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Question 141 Mark
What are the similarities between the Plant cell and Animal cell?
Answer
They both have cell membrane, cytoplasm, nucleus, ribosomes, golgi bodies, mito-chondria, vacuoles and chromosomes.
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Question 151 Mark
What do micro-organisms need for growth?
Answer
Micro-organisms need soil, water and decaying material. Temperature suitable for microbial growth is 15 to 35°C moist, humid and warm climate.
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Question 161 Mark
What are the similarities between the Plant cell and Animal cell?
Answer
They both have cell membrane, cytoplasm, nucleus, ribosomes, golgi bodies, mito-chondria, vacuoles and chromosomes.
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Question 171 Mark
What is a vaccine?
Answer
Vaccine is a live micro-organism which is weak but in a very small amount, and is injected into a person so that antibodies are produced against that micro-organism.
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Answer the following questions:[1 M] - Science STD 7 Questions - Vidyadip