CSEC Biology Paper 1 May/June 2005 - Free CXC Past Paper with Answers

When does respiration occur in plants?

Which of the following is NOT indicated by the direction of the arrows in a food chain?

Which of the following situations BEST exemplifies an ecological community?

The sites of the production of ATP (adenosine triphosphate)

Structures that move to the poles of the cell during cell division

Which of the following processes does NOT contribute to the carbon dioxide content of the atmosphere?

The part of the gut into which bile empties is the

The variation in cellular structure found in any complex organism is due to a process called

When athletes run a long-distance race, which of the following changes takes place in their bodies?

The solution in Jar Z should be

These characteristics are MOST likely to be associated with the

In a patient with a certain defective heart condition, it is found that blood flows from Point I to Point II. This is MOST likely due to the malfunction of the

Which of the structures contain chloroplasts?

A whole plant has its roots submerged for a few hours, in water coloured with red ink. In which part of its leaves does the ink FIRST show up?

Human red blood cells are normally

In which organ of the body do the changes in concentration of the substances shown in the table occur?

Manufactured food is transported in

Companion cells are represented by

Which of the following substances is NOT an excretory product of body metabolism?

Which of the following organisms has the LEAST need for a transport system?

Which of the following arteries does NOT carry oxygenated blood?

Which of the following sequences BEST describes the circulation of blood in the body?

The MAIN function of cartilage at the end of long bones is to

The name of the process which occurs in Q is

The primary function of the neural spine of the lumbar vertebra is for

These actions are examples of

Which of the following conditions does NOT increase the rate of transpiration?

Internal reflection of light within the eye is prevented by the

Which of the following statements are true of humans?

I. Males produce more gametes than females. II. Females produce more gametes than males. III. Males produce gametes for a longer period than females. IV. Females produce gametes for a longer period than males.

Which of the following processes is likely to contribute MOST to the decrease in dry mass between stages I and II on the graph above?

When the skin of the hand touches a hot object, the sequence of impulse flow is

The numbered structures in the reflex arc are

For a student to recall his biology notes, action takes place in

A seedling illuminated from one side bends towards the light source because the concentration of auxins becomes

Which structure(s) above will be involved in temperature regulation if there is a decrease in the external temperature?

Sexual reproduction is important because

A flower has a long style with a feather stigma, long filaments, no corolla and very small sepals. This flower is adapted for

Which of the following correctly identifies the structures labelled X, Y and Z in the diagram above?

Which of the following processes produce clones?

I. The growth of a fungus on a piece of bread II. The development of plantlets at the leaf margins of Bryophyllum III. Propagation of sugar cane from cuttings IV. Germination of seeds from the same pod

Each daughter cell produced by mitosis has

The sperm of a certain animal contains 16 chromosomes. How many chromosomes will there be in the nucleus of its skin cell?

In which of the following parts of the plant would you expect the process of mitosis to occur?

Which of the following processes produce clones?

I. The growth of a fungus on a piece of bread II. The development of plantlets at the leaf margins of Bryophyllum III. Propagation of sugar cane from cuttings IV. Germination of seeds from the same pod

Which of the following crosses will produce a 1:1 ratio in the genotype of the offspring?

Which of the following shows the sex chromosomes present in the human male and female?

Breeders have developed many varieties of plants and animals with desirable characteristics. This process is called

To which of the following groups does a disease caused by a pathogen belong?

Through which of the following means can natural immunity be obtained?

I. Blood transfusion II. Breastmilk III. The placenta IV. Vaccines

Which of the following are direct consequences of disease in humans? I. Loss of man hours and productivity II. Loss of human life III. Loss of livestock and crops

The following statements were made by a number of drug users. I. I drink strong coffee every hour. The caffeine keeps me going. II. I have to inject myself with insulin twice a day. III. I know alcohol is not good for me so I only have three drinks a day. IV. I take antibiotics regularly in case I catch a cold.

Which of these individuals could be considered drug abusers?

Which of the following is the BEST method for investigating the range of organisms found between the low tide mark and the high tide mark on a sloping, rocky sea shore?

Which of the following graphs BEST represents what will happen to the fish population in a pond after caustic soda is dumped in it?

Two soil components that are derived from the parent rock material are

Which of the stages in the cycle identified below result from the activity of micro-organisms?

Which of the following factors has NOT contributed to the marked increase in the life expectancy of humans over the last 100 years?

These characteristics MOST likely belong to a plant which grows in a region that is

Replanting trees on a bare hillside is an example of

Which of the following is an advantage of using inorganic fertilizers rather than organic manure?