Showing posts with label class9-biology. Show all posts
Showing posts with label class9-biology. Show all posts

Monday 15 May 2023

Class 11 Biology: How does Ion Movement and Gradients play an important role in diffusion and osmosis in plasma membrane? #biology #eduvictors

How does Ion Movement and Gradients play an important role in diffusion and osmosis in plasma membrane?

Class 11 Biology

Class 11 Biology: How does Ion Movement and Gradients play an important role in diffusion and osmosis in plasma membrane? #biology #eduvictors


Ion movement and gradients play an important role in diffusion and osmosis in plasma membranes.

  • Diffusion is the movement of particles from an area of high concentration to an area of low concentration. In the case of plasma membranes, ions will diffuse from an area where they are more concentrated to an area where they are less concentrated. This process is driven by the kinetic energy of the ions, and it does not require any energy input from the cell.
  • Osmosis is the movement of water across a semipermeable membrane from an area where it is more concentrated to an area where it is less concentrated. The concentration of water is affected by the concentration of dissolved ions. In the case of plasma membranes, water will move from an area where there is a high concentration of dissolved ions to an area where there is a low concentration of dissolved ions. This process is also driven by the kinetic energy of the water molecules, and it does not require any energy input from the cell.

Ion movement and gradients can affect the rates of diffusion and osmosis in plasma membranes. For example, if the concentration of ions on one side of the membrane is increased, the rate of diffusion of those ions will decrease. This is because the ions will be more likely to collide with each other and with the membrane, which will slow them down. Similarly, if the concentration of water on one side of the membrane is increased, the rate of osmosis will decrease. This is because the water molecules will be more likely to collide with each other and with the membrane, which will slow them down.

Ion movement and gradients are also important for the maintenance of the resting membrane potential. The resting membrane potential is a difference in electrical charge between the inside and outside of a cell. This difference in charge is created by the unequal distribution of ions across the membrane. The concentration of sodium ions is higher outside the cell, while the concentration of potassium ions is higher inside the cell. This difference in ion concentration creates an electrical gradient across the membrane. The resting membrane potential is important for a variety of cell functions, including cell signaling and cell division.



Saturday 18 February 2023

Tuesday 12 October 2021

Class IX Science Term 1 MCQs (2021-22) (#cbseTerm1)(#class9Science)(#eduvictors)

Class IX Science Term 1 MCQs (2021-22)

Class IX Science Term 1 MCQs (2021-22) (#cbseTerm1)(#class9Science)(#eduvictors)

Q1. Rusting of an article made up of iron is called

(a) corrosion and it is a physical as well as chemical change

(b) dissolution and it is a physical change

(c) corrosion and it is a chemical change

(d) dissolution and it is a chemical change


Monday 30 August 2021

CBSE Class 9 Biology - Cell: The Fundamental Unit of Life (MCQs)(#class9Biology)(#cbse2021)(#eduvictors)

CBSE Class 9 Biology - Cell: The Fundamental Unit of Life (MCQs)

CBSE Class 9 Biology - Cell: The Fundamental Unit of Life (MCQs)(#class9Biology)(#cbse2021)(#eduvictors)

Image Credits: Animal Cell By OpenStax, wikimedia


Choose the correct option from the MCQs given:


Q1: Which structure in plant cell is responsible for providing the energy required to drive cellular processes?

(a) Chloroplast

(b) Mitochondrion

(c) Nucleus

(d) Golgi apparatus

Thursday 31 December 2020

Class 9 - Biology - Why Do We Fall ill? (Worksheet-2)(#class9Biology)(#eduvictors)(#cbse2020)

 Class 9 - Biology - Why Do We Fall ill? (Worksheet-2)



Fill in the blanks with suitable words.

1. ________ is a state of complete physical, mental and social well-being and not merely an absence of disease or infirmity.


2. A ________ is any physical or functional change from the normal state that causes discomfort, disability or impairs the health of a person.


3. Diseases may be classified as infectious and non-infectious depending upon their causes, or as _______ and _______ depending upon their duration.

Saturday 3 October 2020

Biology - Scientific Names (#Class11Biology)(#NEET)(#Class12Biology)(#Class9Biology)

 Biology - Scientific Names 

Biology - Scientific Names (#Class11Biology)(#NEET)(#Class12Biology)(#Class9Biology)


1. Swedish botanist Carolus Linnaeus established binomial nomenclature. 

2. Caper Bauhin expressed proposed binomial nomenclature for the first time 

3. In binomial nomenclature, the first word is a generic name having first letter capital and second word is a  specific epithet having first letter. e.g.  Homo sapiens, Mangifera indica

4. After end of biological name, the name of author is written in abbreviated form who gave the name to that organism.

5. Both the words of a biological name when handwritten are separately underlined and when printed are typed in italics to indicate their Latin origin and also give respect to the name.

Monday 14 September 2020

CBSE Class 9 - Biology - Animal Tissues (MCQs)(#class9Biology)(#eduvictors)(#animaltissues)

Animal Tissues (MCQs)

CBSE Class 9 - Biology

CBSE Class 9 - Biology - Animal Tissues (MCQs)(#class9Biology)(#eduvictors)(#animaltissues)


Read the question carefully and choose the correct option from the choices given.


Q1: The tissue responsible for movement in our body is

      (A) connective tissue 

      (B) nervous tissue 

      (C) muscular tissue 

      (D) epithelial tissue


Q2: Neuron receives and transmits information and messages in the form of

      (A) nerve beats 

      (B) muscular impulses

      (C) nerve impulses 

      (D) nerve processes

Monday 7 September 2020

CBSE Class 9 - Biology - Plant Tissues (MCQs) (#eduvictors)(#class9biology)(#plantTissues)

CBSE Class 9 - Biology - Plant Tissues (MCQs)

CBSE Class 9 - Biology - Plant Tissues (MCQs) (#eduvictors)(#class9biology)(#plantTissues)


Multiple Choice Questions (MCQs)


Q1: Which of the following has the ability to divide ?

 (a) Xylem

 (b) Phloem

 (c) Meristematic Tissues

 (d) Permanent Tissues


Q2: The growth is plants is

(a) limited to certain regions

(b) uniform in all parts

(c) limited to top region

(d) limited to roots only.

Wednesday 13 May 2020

CBSE Class 9 - Biology - Cell - Fundamental Unit Of Life - 1 Marker Questions (#class9Biology)(#eduvictors)

CBSE Class 9 - Biology - Cell - Fundamental Unit Of Life - 1 Marker Questions

CBSE Class 9 - Biology - Cell - Fundamental Unit Of Life - 1 Marker Questions (#class9Biology)(#eduvictors)
Animal Cell (Image Credits: AJC1, Flickr)

Q1. Name the cell organelle which is commonly called ‘suicidal bag’ of the cell.

Q2. Which cell organelle are termed the ‘powerhouses’ or ‘storage batteries’ of the cell?

Q3. Name cell organelles having double-membrane envelope.

Q4. Name the organelle which is associated with protein synthesis.

Q5. Which organelle of plant cell has chlorophyll pigments in it?

Q6. Who proposed the fluid mosaic model of the structure of the plasma membrane?

Q7. Who coined the term ‘cell’ and in which year?

Q8. Name the scientists who proposed ‘cell theory’.

Sunday 5 January 2020

CBSE Class 9 - Biology - Why Do We Fall Ill? - Worksheet (#class9Biology)(#eduvictors)

Class 9 - Biology - Why Do We Fall Ill?

Worksheet 

CBSE Class 9 - Biology - Why Do We Fall Ill?  - Worksheet (#class9Biology)(#eduvictors)



Fill in the banks with suitable word(s)

1. Pathogens causing diseases like common cold, influenza, dengue fever, AIDS are ________.

2. Pathogens causing diseases like typhoid, cholera, antrax, tuberculosis are _________.

3. Pathogens causing diseases like skin infections are __________.

4. Pathogens causing diseases like malaria, kala-azar are _________.

Saturday 21 December 2019

CBSE Class 9 - Biology - Diversity In Living Organisms (Very Short Answer Based Questions) (#CBSEclass9Biology)(#eduvictors)

Diversity In Living Organisms (Very Short Answer Based Questions)CBSE Class 9 - Biology

CBSE Class 9 - Biology - Diversity In Living Organisms (Very Short Answer Based Questions) (#CBSEclass9Biology)(#eduvictors)

Q1: Who introduced the system of scientific nomenclature of organisms?

Q2: In which Kingdom, an organism does not have a well defined nucleus and organelles?

Q3: In the hierarchy of classification, which group will have the largest number of organisms?

Q4: Which in your opinion is more basic characteristic for classifying organism. The place where they live in or the kind of cells they are made of?

Q5: Give examples of the organisms that have cilia and flagellum for moving around.

Q6: In the hierarchy of classification, which group will have the smallest number of organisms and a maximum number of similar characteristics?

Q7: Name the substance which makes the cell wall of fungi.

Q8: Name a symbiotic life form that grows on the bark of a tree as large, coloured patches.

Wednesday 24 April 2019

Class 9 - Biology - Cell: Fundamental Unit Of Life - Cell Membrane - Structure and Functions (#cbsenotes)(#eduvictors)

Cell Membrane - Structure and Functions

Class 9 - Biology - Cell: Fundamental Unit Of Life

Class 9 - Biology - Cell: Fundamental Unit Of Life - Cell Membrane - Structure and Functions (#cbsenotes)(#eduvictors)
Plasma Membrane Diagram
Image Credits: Ruth Lawson. Otago Polytechnic Wikimedia

Structure:
  1. Cell membrane is also called as plasma membrane or plasma lemma.
     
  2. It is the limiting boundary of each cell which separates the cytoplasm from its surroundings.
  3. It is found in both plant as well as animal cells.
  4. It is the outermost covering of a cell in case of animals and lies below the cell wall in case of plants.
     

Sunday 21 April 2019

CBSE Class 9 - Biology - Chapter 5 - Fundamental Unit Of Life - Very Short Answers Based Questions (Set-1)

Cell: Fundamental Unit Of Life

Very Short Answers Based Questions (Set-1)
Class 9 Biology

CBSE Class 9 - Biology - Chapter 5 - Fundamental Unit Of Life - Very Short Answers Based Questions (Set-1)
Cell Types: Prokaryotes and Eukaryotes
Image credits: Wikimedia 


1. Name the largest cell of living world ?

2. Amoeba is a _______________ organism.

3. Who gave the fluid mosaic model of plasma membrane?

4. Movement of solvent into the cell is called as_____________ .

5. Which cell organelle is called as the ‘Head quarter of cell’?

Thursday 24 January 2019

CBSE Class 9 - Biology - Class of Living Organisms (Worksheet-2)(#cbsenotes)(#eduvictors)

Diversity in Living Organisms (Worksheet-2)

Classification

CBSE Class 9 - Biology - Class of Living Organisms (Worksheet-2)(#cbsenotes)(#eduvictors)

Fill in the blanks with suitable words.


1. Grouping of things on the basis of certain common characteristics is called __________.


2. There are two systems of classification — the ________ system and the ________ system.


3. Carolus Linnaeus divided all organisms into two kingdoms - ________ and __________.

4. ________ arranged all living organisms into five kingdoms - Monera, Protista, Fungi, Plantae and Animalia.

Monday 17 December 2018

CBSE Class 9 - Biology - Chapter 7 - Diversity in Living Organisms (Worksheet) (#eduvictors)(#cbsenotes)

Diversity in Living Organisms (Worksheet)

CBSE Class 9 - Biology - Chapter 7 - Diversity in Living Organisms (Worksheet) (#eduvictors)(#cbsenotes)

Fill in the blanks with suitable words.


1. _____________ is the division of organisms on the basis of characteristics into groups and sub-groups. It helps us in exploring the diversity of life forms.


2. A ___________ which forms the basis of classification, may be a particular form or function.


3. _____________, in 1969 proposed ‘Five kingdoms classification’ of living organisms.


4. In 5 kingdoms classification, the hierarchy can be represented as ___________ sub grouping into _______ for animals or _________ for plants.


Thursday 11 October 2018

Class 9 - Biology - Why do we fall ill? - Important Definitions (#cbsenotes)(#eduvictors)

Why do we fall ill? - Important Definitions

Class 9 - Biology - Why do we fall ill? - Important Definitions (#cbsenotes)(#eduvictors)

Health: 
A state of being well enough to function well physically, mentally and socially.

WHO defined health as ‘a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity’"

Disease:
Lack of feeling of ease or distress due to impairment of health or a condition of abnormal functioning or structural disorder.

Hygiene :
Condition and practices that help to maintain health and prevent the spread of diseases.


Symptoms:
A series of events occurring that often point to a disease or condition.

Signs:
Objective evidence of disease as identified by physicians or doctors.