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1.
The matured sex cell which takes part in sexual reproduction is referred to as
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A.
gamete
B.
fetus
C.
embryo
D.
zygote
Explanation. Give a better Explanation
Gametes are reproductive cells (sex cells) that unite during sexual reproduction to form a new cell called a zygote. Male gametes are sperm and female gametes are ova (eggs).
Embryo is the stage of animal development in the uterus before the animal is considered a fetus. In humans this is equivalent to the first three months.


2.
The biome that is characterized with large herbivores, few and scattered fire resistant trees is
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A.
savanna
B.
tropical rain forest
C.
montane forest
D.
desert
Explanation. Give a better Explanation
Savannas are quite low in tree species diversity because of stringent ecological requirements but fairly high in diversity of herbaceous plants. Tree growth is controlled not only by rainfall but also by soil type; large areas of hardpan soils, allow no tree roots to penetrate except through cracks, and the cracks determine tree distribution.
Large mammals are at their most diverse in this open environment, in which they can move about freely and yet find shelter among woody vegetation. Large herbivores are successful because of the tremendous biomass of herbaceous vegetation produced annually, and there are many carnivores to crop them in turn.
Tropical rain forests occur in areas of tropical rainforest climate in which there is no dry season, distinct buttress roots of trees.
Montane forest refers to any ecosystem found in mountains. These ecosystems are strongly affected by climate, which gets colder as elevation increases.
A desert is a barren area of landscape where little precipitation occurs and consequently living conditions are hostile for plant and animal life.


3.
Red blood cells are also known as _________?
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A.
erythrocytes
B.
thrombocytes
C.
phagocytes
D.
leucocytes
Explanation. Give a better Explanation
Red blood cell aslo kn own as erythrocytea disk-shaped, biconcave cell in the blood that contains hemoglobin, lacks a nucleus, and transports oxygen and carbon dioxide to and from the tissues

White blood cells or leukocytes, are cells of the immune system involved in defending the body against both infectious disease and foreign materials.

Platelets, or thrombocytes or yellow blood cells, are very small, irregularly shaped clear cell fragments (i.e. cells that do not have a nucleus containing DNA. Platelets are a natural source of growth factors. They circulate in the blood of mammals and are involved in hemostasis, leading to the formation of blood clots.

Phagocytes are cells that protect the body by ingesting harmful foreign particles, bacteria, and dead or dying cells


4.
The joint between the femur and tibia is known as ________?
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A.
hinge joint
B.
ball-and-socket joint
C.
pivot joint
D.
gliding joint
Explanation. Give a better Explanation
The knee joint is one of the strongest and most important joints in the human body. It allows the lower leg to move relative to the thigh while supporting the body’s weight.

Movements at the knee joint are essential to many everyday activities, including walking, running, sitting and standing.

The knee, also known as the hinge joint(tibiofemoral joint) formed between three bones: the femur, tibia, and patella.

A gliding joint, also known as a plane joint or planar joint, is a common type ofjoint formed between bones that meet at flat or nearly flat articular surfaces.

Pivot joint, also called rotary joint is a freely moveable joint that allows only rotary movement around a single axis. Pivot joints also provide for the twisting movement of the bones of the forearm (radius and ulna) against the upper arm.

The ball and socket joint (or spheroidal joint) is a type of synovial joint which enables the bone to move in many places (nearly all directions). These are found in the hip.


5.
What is the primary function of cofactors?
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A.
To aid in enzyme function
B.
To synthesize enzymes
C.
To inhibit enzymes
D.
To break down old enzymes
Explanation. Give a better Explanation
Most enzymes do not function optimally, or even at all, unless bound to other non-protein helper molecules called cofactors.


6. q-image

Use the diagram below to answer the question that follow:
The diagram represents a

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A.

hygrometer

B.

Wind vane

C.

Anemometer

D.

rain gauge

Explanation. Give a better Explanation
Wind vane is used to measure the direction of the wind.


7.
Coloration of the eye is ______ variation
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A.
physiological
B.
morphological
C.
adaptive
D.
recessive
Explanation. Give a better Explanation
Eye coloration is a caused by morphological variation


8.
Which of the following choices correctly describes the composition of the cell membrane?
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A.
contains only lipids
B.
contains lipids and protein
C.
contains lipids and cytosol
D.
contains only proteins
Explanation. Give a better Explanation
It consists of a lipid bi-layer with embedded proteins. The basic function of the cell membrane is to protect the cell from its surroundings.

The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules


9.
The feeding relationship among a set of members of a community is referred to as _______?
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A.
a food web
B.
pyramid of energy
C.
a food chain
D.
pyramid of member
Explanation. Give a better Explanation
Feeding relationships between organisms in a community are represented by food chains, which show the sequence in which organisms feed on each other. The chain generally begins with an autotroph such as a green plant (e.g. stinging nettle ---> small tortoiseshell butterfly caterpillar --> house sparrow --> sparrowhawk), or with dead organic matter (detritus) (e.g. leaf litter --> earthworm --> young blackbird --> fox). The arrows indicate the passage of food, and therefore energy flow, from one organism to another.

Pyramids of energy are the most accurate representation of feeding relationships in a community, providing information about the amount of energy flowing through each trophic level over a set period of time.

Food web involve many complex feeding relationship and most most ecosystems are more complex than food chain


10.
Nitrogen is released into the atmosphere when ________
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A.
plants absorbs mineral salt
B.
sugar is completely broken down
C.
through plant uptake
D.
when lightning strike
Explanation. Give a better Explanation
Nitrogen is essential to all living systems, which makes the nitrogen cycle one of Earth's most important nutrient cycles.

Atmospheric nitrogen becomes part of living organisms in two ways. The first is through bacteria in the soil that form nitrates out of nitrogen in the air. The second is through lightning. During electrical storms, large amounts of nitrogen are oxidized and united with water to produce an acid that falls to Earth in rainfall and deposits nitrates in the soil.


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