BIOLOGY form 4 List of Popular Definition

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4551/2 Tips For Exam 2014

List of popular Definition Term

Definition (Marking Scheme)

Cell

The basic units of life / living organism

Tissue

A group of same cells which have same structure and same function that perform a specific function

Organ

(An organ consists of) a group of different tissues that (group together to) perform a specific function

Cell specialization

P1 : The process where cells change shape / structure and differentiate. P2 : To carry out / perform specific function

Internal environment

P1-(physical and Chemical) condition within our body P2-Extracellular fluid that surround our body cells P3-Example are body temperature, blood glucose level, pH, blood osmotic potential and blood pressure P1&any other P

Homeostasis

MAX 2

P4-A process of maintaining internal environment/physical and chemical condition in our body at a constant value P5-through corrective mechanism based on negative or positive feedback P6-which revert the internal environment back to normal condition of there is a change P4& any other P

MAX 2

Chapter 3 Semi premable membrane

A membrane that allows only certain substances to move freely across it.

Simple diffusion

P1-The net movement of molecule /ions P2-from a high concentration to a region of lower concentration P3-down / follow the concentration gradient P4-Untill the dynamic equilibrium is achieved

Osmosis

Active transport

(The net movement) of water molecules from a lower solute concentration region to a high solute concentration region through a semi permeable membrane Movement of molecule or ions, against the concentration gradient across plasma membrane with the help of carrier protein and energy / ATP Module Biology Trial Paper Collection

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4551/2 Tips For Exam 2014

Chapter 4 Enzyme

P1-enzyme is an organic catalyst P2-enzyme is a protein which speed up biochemical reaction in living thing

Extracellular enzyme

P1-Enzyme which is synthesized in the cell P2-Secreted out of the cell to work externally

Intracellular enzyme

P1-Enzyme which produced in the cell P2-for use of itself

Chapter 5 Mitosis

P1-The division of cell nucleus forms two daughter cell P2-Each with same chromosome number and type of chromosome as the parent

Cloning

P1-process of producing new genetically identical organism (refer to the question needed eg. Frog ) P2-Through asexual reproduction P3-by stem/leaf cutting/layering/grafting/tissue culture

Chapter 6 Autotrophic nutrition

Synthesize its own glucose / starch from carbon dioxide and water with the help of light energy through the process of photosynthesis

Heterotrophic nutrition

Obtain its food source/organic substances from the surroundings (eat plant/ producer)

Balanced diet

F1-A balance diet contains al the seven major nutrients which include carbohydrates, protein lipids, vitamin, minerals water and roughage/(dietary) fibre F2-In the correct amount and ratio// in the correct proportions to meet the daily requirement of the body

Malnutrition

F1-Malnutrition result from taking an unbalanced diet F2-Certain nutrient are excess, lacking or in the wrong proportions

Photosynthesis

F1-(Photosynthesis is the )process where by a green plant synthesizes glucose form carbon dioxide and water F2-In the presences of chlorophyll and sunlight

Module Biology Trial Paper Collection

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