BIOLOGY Paper 3 2004-2010

BIOLOGY PAPER 3 (2003-2010)

YEAR	QUESTION 1	QUESTION 2
2003	To study the effect of camouflage on a predator-prey relationship [Chapter 8]	To study the relationship between the concentration of CO2 and the rate of photosynthesis [Chapter 6]
2004	To determine the % of vitamin C in fruit juices using DCPIP solution [Chapter 6]	To estimate the size of the bird population [Chapter 8]
2005	To determine and compare the energy content in white bread and peanuts [Chapter 6]	To determine the concentration of the solution which will maintain the mass of plant tissues. [Chapter 3]
2006	To study the effect of concentration of albumen suspension on the rate of reaction of pepsin enzyme [Chapter 4]	To determine concentration of sucrose which is isotonic to cell sap of mango [Chapter 3]
2007	To study the effect of light intensity on the rate of photosynthesis of a Hydrilla sp. [Chapter 6]	To study the effect of temperature on the rate of anaerobic respiration in yeast [Chapter 7]
2008	To investigate the effect of light intensity on the population distribution of Pleurococcus sp. [Chapter 8]	To study the size of molecules that can diffuse through a semi permeable membrane [Chapter 3]
2009	To study the effect of light intensity on the rate of photosynthesis. [Chapter 6]	To study the effect of temperature on the rate of enzyme reaction. [Chapter 4]
2010	To investigate the effect of different duration of activity on the percentage of CO2 in exhaled air [Chapter 7]	To study the effect of interspecific competition between maize and paddy plants on their growth. [Chapter 8]

CELL STRUCTURE and CELL ORGANISATION

Answers to Page 13 (Textbook)

Section A

1. a) X : Animal cell

Y : Plant cell

b) i) A plant cell has cell wall

ii) A plant cell has large vacuole

iii) A plant cell has chloroplasts.

c) i) P : mitochondrion

ii) R : Golgi apparatus

iii) S : Chloroplast

d) -Completes the synthesis of carbohydrates and hormones

- Processes, modifies and packs protein

e) Organelle P is a mitochondrion, which is the site for generating energy. Energy is requiredfor cell division, excretion and respiration. If there is no organelle P, all cell activities will stop.

2. a) Stomach. Digestion of food

b) Epithelial and smooth muscle

c) The tissue which are found in the skin are epithelial tissues, connective tissues and nerve tissues. Epithelial tissues function as a protective layer. Connective tissues such as blood, supplies oxygen and nutrients to the skin. Muscle tissues are used for the movement of hair in the hair follicles of the skin. Nerve tissues receive stimulus and send impulses from the skin to the central nervous system.

d) Cells --> Tissues --> Organs --> Systems --> Organism

Section B

3a) Refer to notes.

b)

Organelle	Function
Nucleus	Controls cell activities and contains genetic material
Mitochondria	Site for generating energy through cellular respiration
Chloroplast	Site for photosynthesis
Golgi apparatus	Complete the synthesis of proteins, glycoproteins and hormones.

c)

Animal cell	Plant cell
Similarity
Both cells have nucleus, cytoplasm, plasma membrane, mitochondrion, ER, Golgi body, ribosomes
Differences
Has irregular shape	Has regular shape
No cell wall	Has cell wall
No chloroplast	Has chloroplast
Has glycogen granules	Has starch granules
Has none or small vacuoles	Has big vacuoles

4. (a) Adaptations in the structure and physiology of to carry out certain function

(b) Cell

- Both its structure and shape differ from one type to another.

- Each cell carries out specific function.

- A group of cells that have similar structures and perform similar functions form tissue.

Tissue

-Epithelial tissue functions as a protective layer.

- Muscular tissues are able to contract and produce motion for movement purposes.

- Nervous tissues consist of neurons and are specialised in transmitting nerve impulses.

- A group of different types of tissues together to form an organ.

Organ

- Stomach is made up of epithelial and muscular tissues .

- Kidneys are made up of muscular tissues, connective tissues and epithelial tissues.

- A few organs interrelate to form an organ system.

System

- Digestive system consists of mouth cavity, oesophagus, stomach, intestines and pancreas.

- Respiratory system consists of lungs, trachea, bronchus and the nose.

- Nervous system consists of the brain and spinal cord.

- All the organ systems work together to form a multicelullar organism.

CELLS
1. Living things is made of basic units called cells.
2. The living component of a cell is called the protoplasm. The protoplasm consist of the cytoplasm and the
     nucleus.
3. The protoplasm is surrounded by plasma membrane in both animal and plant cells.