Class 11 Biology Plant Physiology Notes PDF | CBSE & NEET
NEET Biology Notes ,( Line-by-Line Explanation)
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| Plant Physiology in Flowering Plants – Understanding Photosynthesis, Respiration, Growth, and Environmental Factors (CBSE Class 11 Biology) |
Introduction to Plant Physiology
Original Line 1:
"The description of structure and variation of living organisms over a period of time, ended up as two, apparently irreconcilable perspectives on biology."
Easy Notes:
- Biology studies the structure (body form) and variation (differences) of living organisms.
- Scientists studied living organisms in two different ways.
- At first, these two ways looked very different (irreconcilable).
- Irreconcilable = Difficult to combine or match.
NEET Point: Biology has two major approaches to study life.
Original Line 2:
"The two perspectives essentially rested on two levels of organisation of life forms and phenomena."
Easy Notes:
- These two approaches are based on two levels of organization.
- Living organisms can be studied from:
- Whole organism level
- Cell and molecule level
Keyword: Levels of organization.
Original Line 3:
"One described at organismic and above level of organisation while the second described at cellular and molecular level of organisation."
Easy Notes:
First Level (Organism Level)
- Studies the whole organism.
- Also studies population, community, ecosystem, and biosphere.
- Focuses on how organisms interact with each other and the environment.
Second Level (Cellular & Molecular Level)
- Studies cells.
- Studies organelles.
- Studies molecules like DNA, RNA, proteins, enzymes.
- Explains how life processes happen inside cells.
NEET Remember:
- Organism Level = Ecology
- Cellular Level = Physiology & Biochemistry
Original Line 4:
"The first resulted in ecology and related disciplines."
Easy Notes:
- The study of organisms and their environment became Ecology.
- Ecology explains:
- Organism-environment relationship
- Food chain
- Ecosystem
- Biodiversity
Keyword: Ecology = Interaction with environment.
Original Line 5:
"The second resulted in physiology and biochemistry."
Easy Notes:
- Studying cells and molecules gave rise to:
- Physiology = Study of functions of living organisms.
- Biochemistry = Study of chemical reactions inside living cells.
Examples:
- Photosynthesis
- Respiration
- Digestion
- Protein synthesis
NEET Trick:
- Physiology = Function
- Biochemistry = Chemical reactions
Original Line 6:
"Description of physiological processes, in flowering plants as an example, is what is given in the chapters in this unit."
Easy Notes:
- This unit explains physiological processes in flowering plants.
- It focuses on how plants perform life activities.
Topics included:
- Photosynthesis
- Respiration
- Transport of water
- Mineral nutrition
- Plant growth
- Plant development
Original Line 7:
"The processes of photosynthesis, respiration and ultimately plant growth and development are described in molecular terms but in the context of cellular activities and even at organism level."
Easy Notes:
This unit explains:
Photosynthesis
- Plants prepare food using sunlight.
- Happens in chloroplast.
- Studied at molecular level (chlorophyll, ATP, NADPH).
Respiration
- Food is broken down to release energy.
- Happens in mitochondria.
- Studied through enzymes and ATP production.
Plant Growth
- Cells divide and enlarge.
- Controlled by plant hormones.
- Leads to growth of roots, stems, leaves, flowers.
Important Point
These processes are explained at three levels:
-
Molecular level
- Molecules like ATP, enzymes, chlorophyll.
-
Cellular level
- Activities inside plant cells.
-
Organism level
- Effect on the entire plant.
Original Line 8:
"Wherever appropriate, the relation of the physiological processes to environment is also discussed."
Easy Notes:
- Plant activities depend on the environment.
- Environmental factors affect physiological processes.
Examples:
- Light affects photosynthesis.
- Temperature affects respiration.
- Water availability affects transpiration.
- Carbon dioxide affects photosynthesis.
- Minerals affect plant growth.
NEET Point: Plant physiology is closely linked with environmental conditions.
Quick Revision (NEET)
| Topic | Easy Meaning |
|---|---|
| Organism Level | Study of whole organism and environment |
| Cellular Level | Study of cells |
| Molecular Level | Study of molecules like DNA, enzymes, ATP |
| Ecology | Interaction between organisms and environment |
| Physiology | Study of functions of living organisms |
| Biochemistry | Study of chemical reactions in living cells |
| Photosynthesis | Food preparation in plants |
| Respiration | Energy release from food |
| Plant Growth | Increase in size and development |
| Environment | Light, water, temperature, CO₂ influence plant functions |
NEET One-Liner Summary
- Biology has two approaches: Organism level and Cellular/Molecular level.
- Organism level → Ecology.
- Cellular & Molecular level → Physiology and Biochemistry.
- Plant physiology explains photosynthesis, respiration, growth, and development.
- These processes are studied at the molecular, cellular, and whole-plant (organism) levels.
- Environmental factors such as light, water, temperature, CO₂, and minerals affect plant physiological processes.
CBSE Class 11 Biology
Plant Physiology (Introduction)
A. Multiple Choice Questions (MCQs)
- a) One
- b) Two
- c) Three
- d) Four
- a) Physiology
- b) Biochemistry
- c) Ecology
- d) Genetics
- a) Structure of organisms
- b) Functions of living organisms
- c) Evolution
- d) Classification
- a) Classification of plants
- b) Chemical reactions in living cells
- c) Ecosystems
- d) Evolution
- a) Mitochondria
- b) Chloroplast
- c) Ribosome
- d) Nucleus
- a) Chloroplast
- b) Vacuole
- c) Mitochondria
- d) Golgi body
- a) Light
- b) Soil
- c) Rocks
- d) Sand
- a) Cells
- b) Molecules
- c) Organisms and environment
- d) Enzymes
- a) Energy
- b) Growth only
- c) Water transport
- d) Reproduction only
- a) Plant classification
- b) Plant functions
- c) Animal functions
- d) Fossils
B. Very Short Answer Questions (1 Mark)
1. What is Physiology?
Answer: Physiology is the study of the functions of living organisms.
2. What is Ecology?
Answer: Ecology is the study of interactions between organisms and their environment.
3. Name two physiological processes in plants.
Answer: Photosynthesis and Respiration.
4. What is Biochemistry?
Answer: Biochemistry is the study of chemical reactions occurring in living cells.
5. Name one environmental factor affecting photosynthesis.
Answer: Light.
C. Short Answer Questions (2–3 Marks)
1. Differentiate between Ecology and Physiology.
| Ecology | Physiology |
|---|---|
| Studies interaction with environment. | Studies functions of organisms. |
| Organism level. | Cellular and organism level. |
2. What are the two approaches to studying Biology?
1. Organism Level (Ecology)
2. Cellular and Molecular Level (Physiology & Biochemistry)
3. Why is Plant Physiology important?
- Explains photosynthesis.
- Explains respiration.
- Explains plant growth and development.
4. Mention three environmental factors affecting plant physiology.
- Light
- Temperature
- Water
D. Long Answer Questions (5 Marks)
Explain the two perspectives of Biology.
Biology is studied at two levels.
1. Organism Level- Studies whole organisms.
- Includes Ecology.
- Explains interaction with environment.
- Studies cells.
- Studies molecules.
- Includes Physiology and Biochemistry.
- Explains photosynthesis, respiration, growth and development.
E. Assertion and Reason
Assertion: Ecology studies organisms and their environment.
Reason: Ecology explains interactions between organisms and surroundings.
Answer: Both Assertion and Reason are true, and Reason correctly explains Assertion.
F. Fill in the Blanks
- The study of plant functions is called Physiology.
- The study of chemical reactions is called Biochemistry.
- Plants prepare food by Photosynthesis.
- Respiration releases Energy.
- Ecology studies organisms and their Environment.
- Photosynthesis occurs in Chloroplast.
- Respiration mainly occurs in Mitochondria.
- Plant growth depends on environmental Factors.
- ATP is the energy Currency of the cell.
- Physiology mainly studies Functions.
G. Case Study
Q1. Which physiological process was affected?
Answer: Photosynthesis
Q2. Which environmental factor was responsible?
Answer: Light
Q3. Which branch of Biology explains this process?
Answer: Physiology
Q4. Which branch studies the relationship between plants and their environment?
Answer: Ecology
H. Statement Based Questions
| Statement | Answer |
|---|---|
| Ecology studies cells only. | False |
| Physiology studies functions of living organisms. | True |
| Photosynthesis is affected by light. | True |
| Respiration releases energy. | True |
| Biochemistry studies ecosystems. | False |
I. Match the Columns
| Column A | Column B |
|---|---|
| 1. Ecology | c. Organism and Environment |
| 2. Physiology | b. Plant Functions |
| 3. Biochemistry | a. Chemical Reactions |
| 4. Photosynthesis | d. Food Preparation |
| 5. Respiration | e. Energy Release |
J. One Word Questions
- Study of functions – Physiology
- Study of environment – Ecology
- Food-making process – Photosynthesis
- Energy-releasing process – Respiration
- Energy currency of cell – ATP
Important CBSE Exam Points
- Biology has two approaches: Organism Level and Cellular/Molecular Level.
- Ecology studies organisms and their environment.
- Physiology studies functions of living organisms.
- Biochemistry studies chemical reactions inside cells.
- Major physiological processes include photosynthesis, respiration, growth, and development.
- Environmental factors like light, water, temperature, CO₂, and minerals influence plant physiology.
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