Biology (2017) | Study Mode

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Question 1
A
gamete
B
fetus
C
embryo
D
zygote
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.

Correct option: A
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Question 2
A
savanna
B
tropical rain forest
C
montane forest
D
desert
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.

Correct option: A
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Question 3
A
To aid in enzyme function
B
To synthesize enzymes
C
To inhibit enzymes
D
To break down old enzymes
Explanation
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 4
Biology (2017) Q 6 image
A

hygrometer

B

Wind vane

C

Anemometer

D

rain gauge

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

Correct option: B
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Question 5
A
physiological
B
morphological
C
adaptive
D
recessive
Explanation
Eye coloration is a caused by morphological variation

Correct option: B
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Question 6
A
contains only lipids
B
contains lipids and protein
C
contains lipids and cytosol
D
contains only proteins
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

Correct option: B
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Question 7
A
plants absorbs mineral salt
B
sugar is completely broken down
C
through plant uptake
D
when lightning strike
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.

Correct option: D
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Question 8
A
physiological variation
B
discontinuous variation
C
morphological variation
D
adaptive variation
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.

Discontinuous variation is variation that has distinct groups for organisms to belong to i.e tongue rolling, finger prints, eye color, blood groups

Correct option: C
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Question 9
A
organ
B
system
C
cell
D
Tissue
Explanation
spirogyra and volvox are cells

Correct option: C
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Question 10
A
Water molecules stick to the surface of a mirror.
B
Water sticks to the walls of blood vessels.
C
Water molecules stay on the tip of a pine needle because the water is attracted to the surface of the needle.
D
Water molecules stick to one another and form a bead
Explanation
Cohesion is an ability of water molecule to stick to one another due to the presence of hydrogen bonding

Correct option: D

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