What Criteria Do We Use to Decide Whether Something is Alive? - Science


What criteria do we use to decide whether something is alive?


Solution 1

Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not

Solution 2

Movement is the criteria used to decide whether something is alive.

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Chapter 1: Life Processes - Exercise 1 [Page 25]


Lakhmir Singh Class 10 Biology (Science)
Chapter 1 Life Processes
Exercise 1 | Q 41.1 | Page 25
NCERT Science Class 10
Chapter 6 Life Processes
Intext Questions | Q 2 | Page 95

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Given below are the end products of different reactions involving glucose. Write the appropriate end product in front of the following:

(1) Anaerobic reaction =
(2) Reaction in human muscles =
(3) Aerobic respiration
(4) Reaction in plant cells =
(5) Reaction in liver =

 Why is diffusion insufficient to meet the oxygen requirementsof multi-cellular organisms like humans

 What processes would you consider essential for maintaining life?

Which is the basic requirement of living organisms for obtaining energy?

Match the organisms given in column I with the processes given in column II:

  Column I   Column II
(i) Leech (a) Holozoic nutrition
(ii) Amoeba (b) Autotrophic nutrition
(iii) Mushroom (c) Parasitic nutrition
(iv) Green plant (d) Saprophytic nutrition

Match the terms in column I with those in column II :

  Column I   Column II
(i) Trypsin (a) Liver
(ii) Amylase (b) Gastric glands
(iii) Bile (c) Pancreas
(iv) Pepsin (d) Saliva


Match the terms in column I with their uses in column II

Column I  Column II
(i) Heart (a) Pipes for transport in humans
(ii) Arteries and Veins (b) Clotting of blood
(iii) Xylem vessels (c) Pumping organ
(iv) RBC (d) Water transport in plants
(v) Platelets (e) Carrier of oxygen




Skin : Keratin : : Blood : ____________

Rewrite the food-chain given below with correct sequence.
Grasshopper– Snake– Paddyfield– Eagle– Frog

Complete the following flowchart.

Fill in the blank and explain the statement.

Our muscle cells perform ______ type of respiration during exercise.

Write definition.


Write definition


Write the definition.


Distinguish between Glycolysis and TCA cycle.

Give scientific reason.

Oxygen is necessary for complete oxidation of glucose.

Give scientific reasons.

Fibers are one of the important nutrients.

Give scientific reason.

Kreb's cycle is also known as citric acid cycle.

Answer in detail.
Explain the glycolysis in detail.

Answer in detail.

How all the life processes contribute to the growth and development of the body?

Answer in detail.

Explain the Kreb's cycle with reaction.

Explain the ‘inhalation’.

Why is there a difference in the rate of breathing between aquatic organisms and terrestrial organisms? Explain.

Name the organs that form the excretory system in human beings.

What are the main energy sources of living organisms?

Explain the Steps of Glycolysis.

Assertion: When air is passed through lime water, lime water turns milky.

Reason: Air contains 78% nitrogen and 21% oxygen.

Choose the forms in which most plants absorb nitrogen

  1. Proteins
  2. Nitrates and Nitrites
  3. Urea
  4. Atmospheric nitrogen

Explain the following concept in short:

Role of circulatory system in energy production

Give scientific reason.

Cell division is one of the important properties of cells and organisms.

Classify vitamins according to their solubility.

Give one example of each of the classifications of vitamins.


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