Class 8 Science | Curiosity | Chapter: The Invisible Living World: Beyond Our Naked Eye | Very Short Answer Based Questions (Solved) #eduvictors

Class 8 Science | Curiosity | Chapter: The Invisible Living World: Beyond Our Naked Eye | Very Short Answer Based Questions (Solved) 

Q1: What optical tool helped humans first see tiny things that were not visible to the naked eye? 

A: The microscope.

Q2: What was a curved piece of glass, thick in the middle and thin at the edge, called historically? 

A: A lens.

Q3: What term is used to refer to all living beings, whether plants or animals? 

A: Organisms.

Q4: Who authored the book "Micrographia," published in 1665, which contained detailed drawings of microscopic things? 

A: Robert Hooke.

Q5: What specific term did Robert Hooke use to describe the small, empty spaces he observed in a thin slice of cork? 

A: Cell.

Q6: Who is widely recognised as the "Father of Microbiology"? 

A: Antonie van Leeuwenhoek.

Q7: What is considered the fundamental or basic unit of life for all living organisms? 

A: The cell.

Q8: What red-coloured stain is mentioned for making onion peel cells more visible under a microscope? 

A: Safranin.

Q9: What are the three main basic parts that typically make up a cell? 

A: Cell membrane, cytoplasm, and nucleus.

Q10: Which extra outer layer is present in plant cells, like onion peel cells, but is generally absent in animal cells? 

A: The cell wall.

Q11: Which part of the cell is responsible for regulating all activities and growth within the cell? 

A: The nucleus.

Q12: What provides rigidity and strength, particularly to plant cells? 

A: The cell wall.

Q13: What are the tiny rod-shaped structures in plant cells, some of which (like chloroplasts) contain chlorophyll? 

A: Plastids.

Q14: How do vacuoles typically differ in size and presence between plant and animal cells? 

A: Plant cells have a large vacuole, while animal cells usually have small or no vacuoles.

Q15: How does the unique shape and structure of a cell relate to its role in an organism? 

A: It helps the cell carry out its specific functions.

Q16: What is another common name for nerve cells? 

A: Neurons.

Q17: List the five levels of organisation in a living organism, from the simplest to the most complex. 

A: Cell → Tissue → Organ → Organ system → Organism.

Q18: What term describes organisms that are so tiny they cannot be seen without magnification? 

A: Microorganisms (or microbes).

Q19: Give an example of a microorganism that is made up of just one cell. 

A: Bacteria or Amoeba.

Q20: What is a defining characteristic of viruses that sets them apart from other microorganisms? 

A: They are acellular and reproduce only inside a living cell.

Q21: Name two types of microorganisms that play a crucial role in breaking down plant and animal waste, thereby cleaning the environment. 

A: Fungi and bacteria.

Q22: Which specific microorganism is commonly used in baking to make dough soft and fluffy for items like bread and cakes? 

A: Yeast.

Q23: What is the name of the bacterium responsible for turning milk into curd? 

A: Lactobacillus.

Q24: Which bacteria are found in the root nodules of leguminous plants and help in trapping nitrogen from the air? 

A: Rhizobium.

Q25: Name a group of microscopic plant-like organisms that live in water and are responsible for producing over half of the Earth's oxygen supply. 

A: Microalgae.