Which one of the following is the best way to measure growth of an organism?
An enzyme which has an optimum pH of 3 will function best in the:
In a plant cell, turgor is caused by:
Which of the following are natural barriers to infection?
Ⅲ stomach acid
Asexual reproduction produces:
Plant stems grow towards a light source.This is an example of:
Which of the following statements about diffusion is NOT true?
Anaerobic respiration takes place:
Single-celled organisms do not need a transport system because:
Malaria is spread by:
A typical soil contains mineral particles, humus, water, air and:
In humans, an egg cell is released from an ovary approximately every:
A student observed a plant cell through a microscope and made an accurate drawing of the cell. If her drawing was 80 mm in diameter and had a magnification of ×2000, what was the real diameter of the cell?
The following are all features of insect-pollinated flowers EXCEPT for:
All of the following are organelles EXCEPT for:
A lack of vitamin D in the diet causes:
Which one of the following is a biological component of a pond ecosystem?
A species of mouse has 32 chromosomes in its muscle cells.What will be the numbers of chromosomes in the mouse′s skin cells and sperm cells?
Simple sugars are called monosaccharides because:
The following diagram shows a model used to show how breathing movements take place:
Which part of the model represents the diaphragm?
75 g of freshly dug soil was placed in an oven at 105 ℃ for 24 hours. It was allowed to cool, then reweighed. If the final mass of the dry soil was 66 g, what was the % water content of the original soil sample?
All of the following are possible consequences of global warming EXCEPT for:
Which one of the following diagrams illustrates short-sightedness?
(F = Focal point)
Vaccination causes a person′s immune system to produce:
A cell in an embryo divides by mitosis three times in succession. How many cells will be formed from these divisions?
The correct pathway of water through a plant is:
All of the following have endoskeletons EXCEPT for:
A collection of several tissues which carry out a particular function is called:
Which of the following substances contains the elements carbon, hydrogen, oxygen and
The site of reabsorption of MOST of the water from the filtrate.
All of the following processes result in energy loss from an ecosystem EXCEPT for:
Which of the following routes taken by blood in the body is correct?
The optimum temperature for enzyme action is:
The wall of the left ventricle is thicker than that of the right ventricle because:
Which one of the following structures is responsible for controlling entry and exit of materials into and out of the cell?
Which of the following are examples of environmental variation in humans?
Ⅰ hair colour
Ⅳ body mass
The white blood cells that produce antibodies are called:
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