S 2 Online BIOLOGY One

The following are results of an experiment to determine percentage of water within a sample of soil.
Mass of crucible = 15 g
Mass of crucible + soil = 3 g
Mass of crucible + soil after drying = 25 g.
The percentage of water in the soil is:
1. 18.7
2. 20.0
3. 33.3
4. 66.7
Which one of the following contains a set of characteristics which are all for wind-dispersed fruits and seeds?
1. Parachute-like, hooked and light
2. Dry, curled inwards and spiked.
3. Parachute-like, winged and light.
4. Succulent, buoyant and light.
Which one of the following organs is supplied and drained by a vein?
1. Stomach
2. Liver
3. Kidney
4. Pancreas
In the Biuret test, the colour which indicates a positive result is
1. purple
2. blue
3. pink
4. orange
Which one of the following is not correct statement about flower parts?
1. Sepals and petals together form perianth.
2. Sepals form calyx.
3. Carpels form androecium
4. Petals form corolla.
Which one of the following is a modified tap root?
1. Sweet potato tuber.
2. Carrot tuber
3. Cassava rubber.
4. Irish potato tuber.
Which one of the following groups of bacteria convert soil nutrients to free nitrogen?
1. Nitrifying bacteria.
2. Nitrogen fixing bacteria.
3. Denitrifying bacteria.
4. Putrefying bacteria.
Which one of the following is the route a red blood cell takes from the liver to the lungs?
1. Hepatic portal vein, vena cava, pulmonary artery.
2. Hepatic vein, pulmonary vein, pulmonary artery.
3. Hepatic artery, aorta, pulmonary artery.
4. Hepatic vein, vena cava, pulmonary artery.
To which one of the following groups of plants do Mosses belong?
1. Pteridophytes
2. Bryophytes
3. Angiosperms
4. Monocotyledons
Which of the following are characteristics of wind-pollinated flowers?
1. Feathery stigmas and smooth pollen grains.
2. Stigmas growing much higher than stamens.
3. Free stamens growing higher than stigma.
4. Large pollen grains on firm anthers.
Which one of the following statements describes epigeal germination?
1. Hypocotyl elongates, leaving cotyledons below the ground.
2. Epocotyl elongates, leaving cotyledons below the ground.
3. Hypocotyl elongates cotyledons above the ground.
4. Epicotyl elongates, bringing cotyledons above the ground.
The role of dilute hydrochloric acid added to a solution when testing non-reducing sugar is to
1. neutralise the solution.
2. provide a suitable medium for the action of Benedict’s reagent.
3. hydrolyse the non-reducing sugars.
4. kill the bacteria in the test solution.
Which one of the following is likely to occur if the osmotic pressure of the cell sap of the root hair is lower than that of the surrounding cell of root hair?
1. Remains the same
2. Cells of root hair becomes turgid.
3. Cell of root hair becomes flaccid.
4. More water is absorbed.
Lack of vitamin D in the diet causes
1. anemia
2. scurvy
3. goiter
4. rickets
Which one of the following processes is mineral salts absorbed into the plants?
1. Capillarity
2. Osmosis
3. Diffusion
4. Active transport
Which one of the following parts of a tooth is the hardest part?
1. Cemen
2. Pulp cavity
3. Enamel
4. Dentine
The following are characteristics of blood vessels
(i) Presence of valves
(ii) Thick walls
(iii) Wide lumen
(iv) Elastic walls
Which of the following characteristics belong to veins
1. (i) and (ii)
2. (i) and (iii)
3. (ii) and (iii)
4. (iii) and (iv)
Green plants give out less carbon dioxide during day than at night because during the day
1. the rate of photosynthesis is low.
2. transpiration interferes with escape of carbon dioxide.
3. most stomata close.
4. some of the carbondioxide produced is used up for photosynthesis.
Which one of the following would happen to plasmolysed cells of a plant tissue that has been placed in water for some time?
1. Their cell vacuoles would shrink.
2. They would not experience any change in size.
3. They would increase in volume.
4. They would become shorter.
At high altitudes, the rate of breathing is faster than that at low attitudes because at high altitudes
1. temperature is lower.
2. oxygen concentration is lover.
3. atmospheric pressure is higher.
4. carbon dioxide concentration is higher.
Under which of the following sets of conditions would the rate of transpiration be highest?
1. Cool, humid and windy
2. Warm, dry and windy.
3. Cool, dry and still air.
4. Warm, humid and still air
Which one of the following parts of a microscope is used to obtain a sharp image?
1. Fine adjustment knob.
2. Mirrow
3. Coarse adjustment knob
4. Eye piece
The extensive network of veins on a plant leaf is to ensure
1. passage of gases between the atmosphere and the leaf.
2. even supply of water and mineral salts to leaf cells.
3. Fast diffusion of gases to photosynthesing cells.
4. that dessication does not occur to photosynthesing cells.
To which one of the following groups of plants do pines belong?
1. Byophytes
2. Angiosperms
3. Pteridophytes
4. Gymnosperms
In which one of the following digestive juices is peptidase enzyme found?
1. Saliva
2. Pancreatic
3. Gastric
4. Succus entericus
Which one of the reactions is likely to occur when a donor of blood group A gives blood to a recipient of blood group B?
1. Antibodies a react with antigens B.
2. Antigens B react with antibodies b.
3. Antibodies b react with antigens A.
4. Antigens A react with antigens B.
Which one of the following diseases listed below is a result of insufficient production of insulin in the body?
1. Diabates mellitus
2. Anaemia
3. Goitre
4. Diabetes inspidus
In the human heart, the mixing of oxygenated and deoxygenated blood is prevented by the
1. septum
2. bicuspid valve
3. tricuspid valve
4. semilunar valve.
Lack of nucleus in a red blood cells is advantageous in that it
1. enables the cell to pass through thin epithdium
2. helps the cell to fight disease-causing organisms
3. allows the cell to carry a lot of oxygen.
4. enables the cell to carry much dissolved food.

S 2 Online BIOLOGY One

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