Biology (2017) | Study Mode

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Question 21
A
size
B
ability to taste PTC
C
color
D
fingerprint
Explanation
Morphological variation includes aspects of the outward appearance i.e shape, structure, color, pattern, size which is in contrast to physiology variation which deals primarily with function.

Morphological variation arises from a number of factors which can be bluntly classified as either genetic or environmental implanted into the process of evolution.

Correct option: B
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Question 22
A
coagulation, white bloodcell
B
coagulation, water
C
white blood cells, red blood cell
D
coagulation, red blood cell
Explanation
The clumping of cells such as bacteria or red blood cells in the presence of an antibody or complement.

During blood transfusions, the antibodies react with the transfused blood group(if its of different blood group), the erythrocytes clump up and stick together causing them to agglutinate

Correct option: D
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Question 23
A
hinge joint
B
ball-and-socket joint
C
pivot joint
D
gliding joint
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 bodys 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 24
A
a food web
B
pyramid of energy
C
a food chain
D
pyramid of member
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

Correct option: D
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Question 25
A
they can be seen under microscope
B
they range from 0.5 m in diameter
C
They are grouped accordingly to their cell shape
D
they so not cause disease
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: A
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Question 26
A
organ
B
system
C
cell
D
tissue
Explanation
In unicellular organisms, the single cell performs all life functions. Examples are Amoeba, Euglena
Life can be organised into several different levels of function and complexity.

These functional levels are: cells, tissues, organs, systems and organisms.
Every living thing is made up of a cell or a number of cells.

Correct option: C
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Question 27
A
pectoral and pelvic girdles
B
forelimbs, skull and pectoral girdle
C
lungs and ribs
D
skull and the vertebral column
Explanation
The appendicular skeleton is the portion of the skeleton of vertebrates consisting of the bones that support the appendages.

The appendicular skeleton includes the skeletal elements within the limbs, as well as supporting pectoral and pelvic girdles

Pectoral girdles, arms and forearms, pelvis, thighs and legs, feet and ankles

Correct option: A
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Question 28
A
trypanosome
B
paramecium
C
chamydomonas
D
amoeba
Explanation
Protists are single celled organisms that contain chloroplasts to aid photosynthesis.

Algae ? Protozoa ? Small Insects ? Large aquatic Insects ? Small fish ? Large fish

Correct option: B
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Question 29
A
Two atoms share electrons so they can fill their outer shells
B
The constant motion of electrons and the creation of charge imbalances bonds two molecules together
C
A hydrogen atom with a slight positive charge is attracted to a negative charge of another molecule or atom
D
One atom loses one or more electrons and the other atom gains one or more electrons
Explanation
Covalent bonds form so that atoms can become more stable. They do this by sharing electrons, rather than fully gaining or losing them.

Correct option: A
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Question 30
A
adaptation
B
evolution
C
variation
D
succession
Explanation
Variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation).

Variation may be shown in physical appearance, metabolism, fertility, mode of reproduction, behaviour, learning and mental ability, and other obvious or measurable characters.

Correct option: C

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