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Question 1 Biology (2017) | JAMB/UTME (2017)
A
gamete 
B
fetus 
C
embryo 
D
zygote 
Explanation.
Share Answer 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.

Correct Option:
A
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Question 2 Biology (2017) | JAMB/UTME (2017)
A
savanna 
B
tropical rain forest 
C
montane forest 
D
desert 
Explanation.
Share Answer 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.

Correct Option:
A
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Question 3 Biology (2017) | JAMB/UTME (2017)
A
erythrocytes 
B
thrombocytes 
C
phagocytes 
D
leucocytes 
Explanation.
Share Answer 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

Correct Option:
A
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Question 4 Biology (2017) | JAMB/UTME (2017)
A
hinge joint 
B
ball-and-socket joint 
C
pivot joint 
D
gliding joint 
Explanation.
Share Answer 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.

Correct Option:
A
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Question 5 Biology (2017) | JAMB/UTME (2017)
A
To aid in enzyme function 
B
To synthesize enzymes 
C
To inhibit enzymes 
D
To break down old enzymes 
Explanation.
Share Answer Most enzymes do not function optimally, or even at all, unless bound to other non-protein helper molecules called cofactors.

Correct Option:
A
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Question 6 Biology (2017) | JAMB/UTME (2017)
A

hygrometer

 
B

Wind vane

 
C

Anemometer

 
D

rain gauge

 
Explanation.
Share Answer Wind vane is used to measure the direction of the wind.

Correct Option:
B
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Question 8 Biology (2017) | JAMB/UTME (2017)
A
contains only lipids 
B
contains lipids and protein 
C
contains lipids and cytosol 
D
contains only proteins 
Explanation.
Share Answer 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

Correct Option:
B
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Question 9 Biology (2017) | JAMB/UTME (2017)
A
a food web 
B
pyramid of energy 
C
a food chain 
D
pyramid of member 
Explanation.
Share Answer 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

Correct Option:
D
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Question 10 Biology (2017) | JAMB/UTME (2017)
A
plants absorbs mineral salt 
B
sugar is completely broken down 
C
through plant uptake 
D
when lightning strike 
Explanation.
Share Answer 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.

Correct Option:
D
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