How does air pollution affect living organisms

09/30/2022 0

Illness such as pneumonia or bronchitis, headache, nausea e.t.c Bad smell Irritation to nose, throat, eyes and skin Cause cancer Damage body organs, liver brain ... Read More

Outline the human activities that cause air pollution

09/30/2022 0

Emission from factories Emission from cars, aeroplane, aerosol cans Cigarette smocking Burning of rubbish Burning fuel such coal, kerosene Read More

What is air pollution?

09/30/2022 0

Air pollution is the presence in or introduction into the air of a substance which has harmful or poisonous effects. Read More

Describe an experiment to show that anaerobic respiration takes place in yeast.

09/29/2022 0

Yeast break down glucose (food) into ethanol, carbon dioxide and releases energy. It is a type of cellular respiration that takes place in the absence of ... Read More

Outline any four (4) functions of the human skin other than temperature regulation.

09/29/2022 0

Provides a protective barrier against mechanical, thermal and physical injury and hazardous substances. Prevents loss of moisture. Reduces harmful effects of UV radiation. Acts as ... Read More

Distinguish between excretion and secretion

09/29/2022 0

Excretion is the removal of waste metabolic products from the body. Secretion is a process by which substances are produced and discharged from a cell, ... Read More

Causes of mutation

09/28/2022 0

Ultraviolent light Chemicals Freezing of cells Read More

Define the term “mutation”

09/28/2022 0

This is a change in the amount or structure of DNA of an organism Read More

Processes in the living organism that involve osmosis

09/28/2022 0

Functions of osmosis Absorption of water by the root hair Absorption of water in the loop of Henle Absorption of water in the intestines Read More

A-level math paper 2 Circular motion

09/28/2022 0

Please double click and download the PDF below A-level math paper 2 Circular motion Read More

How does the human body defend itself from disease causing germs?

09/27/2022 0

use physical barriers like your skin to prevent entry of germs produce pathogen-destroying chemicals, like lysozyme, found on parts of your body without skin, including ... Read More

with examples explain passive immunity

09/27/2022 0

A type of immunity that occurs when a person is given antibodies rather than making them through his or her own immune system. For example, ... Read More

With an example define what active immunity is?

09/27/2022 0

Active Immunity results when exposure to a disease organism triggers the immune system to produce antibodies to that disease. Active immunity can be acquired through natural ... Read More

What makes an insect are suited for flight; adaptations of insects to flying

09/27/2022 0

have streamline body have strong flight muscles have exoskeletons for attachment of flight muscles have extensive tracheal system that delivers oxygen directly to the muscles ... Read More

Give a detailed description of the mechanism of flight in insects

09/27/2022 0

Locomotion in insects Insects thorax contain two sets of antagonistic flight muscle; a pair of dorso-ventral muscle (indirect muscle- not attached to the wing) run ... Read More

Describe the menstrual cycle in man.

09/27/2022 0

The menstruation/ sexual/ oestrus cycle This cycle found in female; ensures that female reproductive physiology events are synchronised. For the uterus prepares itself for implantation ... Read More

Describe an experiment to show the action of Saliva on cooked starch

09/27/2022 0

Experiment Two test tubes A and B add equal amount of cooked starch To test tube A add 1cm3 of saliva To test tube B ... Read More

Differences between mitosis and meiosis

09/27/2022 0

    Mitosis meiosis 1. Homologous chromosomes remain separate Homologous chromosomes pair up 2 There no crossing over Crossing over occurs 3. No formation of ... Read More

Importance or significance of meiosis

09/27/2022 0

Sexual reproduction: Meiosis results in half the number of chromosomes, during fertilization the nuclei of the two gametes fuse to form a zygote restore the ... Read More

Importance or significance of mitosis

09/27/2022 0

Genetic stability: It ensures that the daughter cells carry the exact genetic material as the parent cells Growth: growth results in increase in the number ... Read More

Adaptations of intestine villi to absorption

09/27/2022 0

Villi are thin to increase surface area for absorption Well supplied by blood to carry away absorbed food so as to maintain diffusion gradient The ... Read More

Adaptation of small intestine for absorption of food

09/27/2022 0

Long to allow food enough time for absorption Villi and microvilli increase surface area for absorption Well supplied by blood to carry away absorbed food ... Read More

A-level math paper 2 Hooke’s law, elastic strings and Simple harmonic motion

09/27/2022 0

Please double click and download the PDF below A-level math paper 2 Hooke’s law, elastic strings and Simple harmonic motion Read More

Which fins do fish use for braking?

09/26/2022 1

The pectoral fins along with the pelvic fins help the fish by acting as brakes and can assist the fish with difficult maneuvers Read More

A-level math paper 2 Simple harmonic motion

09/25/2022 1

Please double click and download the PDF below A-level math paper 2 Simple harmonic motion Read More

A-level math paper 2 Coplanar forces (rigid bodies)

09/24/2022 0

Please double click and download the PDF below A-level math paper 2 Coplanar forces (rigid bodies)     Read More

In which ways does removal of a hand from a hot object differ from plant shoot growth towards light?

09/19/2022 0

Removal of hand from hot object Plant growth towards light Fast Slow Electrical and chemical Chemical Response to heat Response to light It’s effects are ... Read More

State the importance of plant response to gravity.

09/18/2022 0

Negative geotropism in primary shoot allows shoot grow towards light Positive geotropism  in the primary root that causes it to grow down into the soil, ... Read More

What is the importance of human a stomach.

09/18/2022 2

breaks large particle of food into small particles -  produce hydrochloric acid that kills germs in the food - Produces renin that curdles milk allowing ... Read More

Explain why digestion of food is very important

09/18/2022 0

Digestion is important for breaking down food into soluble absorbable nutrients, which the body uses for energy, growth, and cell repair. Read More

Differences between reproduction in human and amphibians

09/18/2022 0

Differences between reproduction in human and amphibians             Reproduction in human Reproduction in amphibians Internal fertilization External fertilization in toads and frogs but internal in ... Read More

State the functions of human gonads.

09/18/2022 0

The two major functions of the gonads in the adult are steroid hormone production and gametogenesis The ovaries produce (eggs/ova) and secrete estrogen and progesterone. These hormones ... Read More

What are gonads?

09/18/2022 0

Organs that organs that produce and release gametes or reproductive cells that is; ovaries (produce eggs)  in female and testis (produce sperms) in male Read More

Longitudinal section of bean seed

09/17/2022 0

Uses of parts of bean seed  seed coat protects inner parts of the seed Plumule grows into shoot system Radicle grows into  root system cotyledon ... Read More

Longitudinal section of maize fruit

09/17/2022 0

Functions of parts of maize fruit Pericarp protects the internal parts Endosperm stores food reserves Cotyledons protect and nourishes the embryo Coleoptile protects the plumule ... Read More

A-level math paper 2 Centre of gravity

09/17/2022 1

Please double click and download the PDF below A-level math paper 2 Centre of gravity Handles general formula for centre of gravity centre of gravity ... Read More

A-level math paper 2 Vector mechanics-relative motion

09/08/2022 0

Please download the PDF below A-level math paper 2 Vector mechanics (relative velocities)   Read More