• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar
  • Skip to footer

CBSE Tuts

CBSE Maths notes, CBSE physics notes, CBSE chemistry notes

  • NCERT Solutions
    • NCERT Solutions for Class 12 English Flamingo and Vistas
    • NCERT Solutions for Class 11 English
    • NCERT Solutions for Class 11 Hindi
    • NCERT Solutions for Class 12 Hindi
    • NCERT Books Free Download
  • TS Grewal
    • TS Grewal Class 12 Accountancy Solutions
    • TS Grewal Class 11 Accountancy Solutions
  • CBSE Sample Papers
  • NCERT Exemplar Problems
  • English Grammar
    • Wordfeud Cheat
  • MCQ Questions

Kerala SSLC Class 9 Solutions for biology – The Sign of Life

Kerala SSLC Class 9 Solutions for biology – The Sign of Life (English Medium)

Page No. 8:

Question 1:
What is the role played by abiotic factors in sustaining life?
Solution:

  • Abiotic factors help support different life forms.
  • Living organisms obtain matter and energy from different abiotic factors and use them for their various life activities.

Question 2:
Are the features of life similar in all organisms?
Solution:
There are different principal processes which occur in all living organisms – respiration, growth, response to stimuli and reproduction.
However, the mechanism of these processes is different in different organisms.

Question 3:
How do the features of the cell become the important sign of life?
Solution:
The two key important features of a cell – metabolism and reproduction – help in sustenance of life and maintain the continuity of life.
These features help the cell to survive and maintain its population over generations.
Thus, these features of the cell are important signs of life.

Page No. 9:

Question 1:
Do you know what is the source of energy in the biosphere?
Solution:
Solar energy from the Sun is the source of energy in the biosphere.

Question 2:
Why can’t the animals absorb solar energy as plants do?
Solution:
Animals do not contain pigments such as chlorophyll to absorb solar energy like plants.

Page No. 10:

Question 1:
Will photosynthesis take place if sunlight and chlorophyll alone are present?
Solution:
No, photosynthesis will not take place in the absence of raw materials such as carbon dioxide and water if sunlight and chlorophyll alone are present.

Question 2:
What are the raw materials needed for photosynthesis? How do they reach the leaves?
Solution:
Carbon dioxide and water are the raw materials needed for photosynthesis. Carbon dioxide from the atmosphere enters leaves through stomata present on the surface. Water is obtained from the soil. It is absorbed by the roots and transported to the leaves by xylem vessels.

Question 3:
Examine the figure and complete the flowchart given below.
kerala-sslc-class-9-solutions-biology-sign-life-1
Solution:
kerala-sslc-class-9-solutions-biology-sign-life-2

Question 4:
Describe the position and the structure of chloroplast.
Solution:
Chloroplasts are present in the cells of leaves and tender stems. They are membrane-bound cell organelles.
kerala-sslc-class-9-solutions-biology-sign-life-3
Each chloroplast is covered by a double membrane. The membrane encloses a colourless ground substance called stroma. Flat, sac-like structures called thylakoids are present in the stroma. Thylakoids are arranged in pile-like stacks of coins called grana.

Question 5:
Name the pigment present in the chloroplast. How does it help in the absorption of light?
Solution:
Chlorophyll pigment is present in the chloroplast. There are different types of chlorophyll. The major ones are chlorophyll a and chlorophyll b.
Chlorophyll a takes part directly in photosynthesis, while chlorophyll b absorbs sunlight and transfers energy to chlorophyll a.

Question 6:
Explain the difference between photosynthesis and chemosynthesis.
Solution:
kerala-sslc-class-9-solutions-biology-sign-life-4

Page No. 11:

Question 1:
Set up the experiment as shown in the figure.
kerala-sslc-class-9-solutions-biology-sign-life-5
Keep this experimental set up, one hour each under the following conditions.

  1. In a room with little light.
  2. Under direct sunlight in the yard.

Did you observe the same change in the test tube when the experimental setup was placed in the room and when placed under direct sunlight?
Solution:
There is a difference in the amount of gas collected in the test tubes when the experimental setup was placed in the room and when it was placed under direct sunlight.
The amount of gas produced in the experimental setup which was placed in the room was lesser than that of gas produced in the experimental setup which was placed under direct sunlight.

Question 2:
Lift the test tube gently above water, light a match stick and hold it against the mouth of the test tube? What happens? What is the reason for this?
Which is the gas produced?
Solution:
The match stick burns more vigorously when held against the mouth of the test tube. This is because the gas collected in the test tube supports combustion. Oxygen gas is produced as a by-product of photosynthesis.

Question 3:
Complete the table.

Photosynthesis
(Phases)
Location Type of reaction
Decomposition/synthesis
Products Necessity of Light

Solution:
kerala-sslc-class-9-solutions-biology-sign-life-6

Page No. 12:

Question 1:
We take the food which is stored by plants. Make a list of the common plant products included in our food.
Solution:
Common plant products included in our food:

  • Cereals
  • Pulses
  • Dals
  • Fruits
  • Vegetables
  • Oil extracted from oil seeds

Question 2:
Analyse the flowchart given below and prepare a note on how the food materials we use in daily life are produced.
kerala-sslc-class-9-solutions-biology-sign-life-7
Solution:

  • Photosynthesis is the key process in plants which helps to convert solar energy from the Sun to chemical energy.
  • This chemical energy is used for the synthesis of glucose.
  • Glucose is then converted to different biomolecules through various processes.
  • Glucose converted to starch is stored in tubers.
  • Glucose converted to proteins is stored in pulses.
  • Glucose converted to lipids is stored in seeds and oilseeds.
  • Glucose is also stored in the form of fructose in fruits and in the form of sucrose in sugarcane.

Primary Sidebar

NCERT Exemplar problems With Solutions CBSE Previous Year Questions with Solutoins CBSE Sample Papers
  • The Summer Of The Beautiful White Horse Answers
  • Job Application Letter class 12 Samples
  • Science Lab Manual Class 9
  • Letter to The Editor Class 12 Samples
  • Unseen Passage For Class 6 Answers
  • NCERT Solutions for Class 12 Hindi Core
  • Invitation and Replies Class 12 Examples
  • Advertisement Writing Class 11 Examples
  • Lab Manual Class 10 Science

Recent Posts

  • Understanding Diversity Question Answer Class 6 Social Science Civics Chapter 1 NCERT Solutions
  • Our Changing Earth Question Answer Class 7 Social Science Geography Chapter 3 NCERT Solutions
  • Inside Our Earth Question Answer Class 7 Social Science Geography Chapter 2 NCERT Solutions
  • Rulers and Buildings Question Answer Class 7 Social Science History Chapter 5 NCERT Solutions
  • On Equality Question Answer Class 7 Social Science Civics Chapter 1 NCERT Solutions
  • Role of the Government in Health Question Answer Class 7 Social Science Civics Chapter 2 NCERT Solutions
  • Vital Villages, Thriving Towns Question Answer Class 6 Social Science History Chapter 9 NCERT Solutions
  • New Empires and Kingdoms Question Answer Class 6 Social Science History Chapter 11 NCERT Solutions
  • The Delhi Sultans Question Answer Class 7 Social Science History Chapter 3 NCERT Solutions
  • The Mughal Empire Question Answer Class 7 Social Science History Chapter 4 NCERT Solutions
  • India: Climate Vegetation and Wildlife Question Answer Class 6 Social Science Geography Chapter 8 NCERT Solutions
  • Traders, Kings and Pilgrims Question Answer Class 6 Social Science History Chapter 10 NCERT Solutions
  • Environment Question Answer Class 7 Social Science Geography Chapter 1 NCERT Solutions
  • Understanding Advertising Question Answer Class 7 Social Science Civics Chapter 7 NCERT Solutions
  • The Making of Regional Cultures Question Answer Class 7 Social Science History Chapter 9 NCERT Solutions

Footer

Maths NCERT Solutions

NCERT Solutions for Class 12 Maths
NCERT Solutions for Class 11 Maths
NCERT Solutions for Class 10 Maths
NCERT Solutions for Class 9 Maths
NCERT Solutions for Class 8 Maths
NCERT Solutions for Class 7 Maths
NCERT Solutions for Class 6 Maths

SCIENCE NCERT SOLUTIONS

NCERT Solutions for Class 12 Physics
NCERT Solutions for Class 12 Chemistry
NCERT Solutions for Class 11 Physics
NCERT Solutions for Class 11 Chemistry
NCERT Solutions for Class 10 Science
NCERT Solutions for Class 9 Science
NCERT Solutions for Class 7 Science
MCQ Questions NCERT Solutions
CBSE Sample Papers
NCERT Exemplar Solutions LCM and GCF Calculator
TS Grewal Accountancy Class 12 Solutions
TS Grewal Accountancy Class 11 Solutions