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BIOLOGY [3 marks Question Answer]

Unit - 2.1 Classification · ICSE STD 7 (ICSE - English Medium). 5 questions.

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[3 marks Question Answer]

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5 questions · timed · auto-graded

Question 13 Marks
List three harmful and three useful effects of bacteria.
Answer
There are number of bacteria that causes various diseases to living organisms, such bacteria are referred to as harmful bacteria. diseases such as cholera, typhoid, pneumonia and tuberculosis etc. in human beings are caused by bacteria.
Some bacteria that are used as probiotics, or those living in human gut are useful bacteria. such as E coli, Streptomyces, lactobacillus etc. out of these E coli helps in the food digestion. lactobacillus is found in curd, and can ferment milk into cheese and yoghurt.
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Question 23 Marks
Give the harmful and useful effects of fungi.
Answer
The harmful effect of fungi are that Some fungus can cause various plant diseases like red rot of sugarcane and powdery mildew in peas and Growth of fungus in food items can spoil the food.
The useful effect of fungi are that they have the ability to transform nutrients in a way that makes them available for plants. Some fungi are decomposers which mean that they break down plant and animal debris, thus cycling nutrient and increasing their availability in the soil
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Question 33 Marks
Distinguish between :
Plantae and Animalia
Answer

Plantae

Animalia

1. These do not show locomotion

1. They show locomotion

2. Plants cells have a cell wall

2. Animal cells lack a cell wall

3. They grow throughout their lifespan

3. These can grow up to a particular age only

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Question 43 Marks
Distinguish between :
Protista and Fungi
Answer

Protista

Fungi

1. Protists are single-celled organisms

1. Fungi are multicellular organisms

2. Types-Algae, molds, Protozoans

2. Types-Seven phyla of fungi

3. Invisible to the naked eye
Example: Amoeba, slime moulds

3. Visible to the naked eye
Example: Yeast, Mushroom

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Question 53 Marks
Distinguish between :
Monera and Protista
Answer

Monera

Protista

1. The cell wall is not well-defined.

1. The cell wall is present and well-defined.

2. Cellular respiration occurs aerobically or through fermentation.

2. Cellular respiration occurs aerobically.

3. Smaller in size
Example: Bacillus, mycobacteria

3. Relatively larger in size

Example: Red algae, green algae

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