Biology (2017) | Study Mode

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Question 11
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 12
A
organ
B
system
C
cell
D
Tissue
Explanation
spirogyra and volvox are cells

Correct option: C
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Question 13
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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Question 14
A
chloroplast
B
cell wall
C
nucleus
D
centrioles
Explanation
Nucleus is a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane. This membrane seems to be continuous with the endoplasmic reticulum (a membranous network) of the cell and has pores, which probably permit the entrance of large molecules. The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information.

Correct option: C
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Question 15
A
adaption
B
evolution
C
variation
D
succession
Explanation
Adaptation is process by which an animal or plant species becomes fitted to its environment; it is the result of natural selections acting upon heritable variation. Even the simpler organisms must be adapted in a great variety of ways: in their structure, physiology, and genetics, in their locomotion or dispersal, in their means of defense and attack, in their reproduction and development, and in other respects.


Evolution explains how living things change over a long time, and how they have come to be the way they are
Variation is 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.

Succession is the process by which the structure of a biological community evolves over time. Two different types of successionprimary and secondaryhave been distinguished. Primary succession occurs in essentially lifeless areasregions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier.

Secondary succession occurs in areas where a community that previously existed has been removed; it is typified by smaller-scale disturbances that do not eliminate all life and nutrients from the environment.

Correct option: A
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Question 16
Biology (2017) Q 16 image
A

atmospheric pressure

B

relative humidity

C

direction of wind

D

spread of wind

Explanation
Wind vane is an instrument for showing the direction of the wind.

Correct option: C
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Question 17
A
diplobacillus
B
coccus
C
bacillus
D
vibrio
Explanation
A coccus (plural cocci) is any bacterium that has a spherical, ovoid, or generally round shape. A bacillus is any bacterium that has a rod shape.

Vibrio is bacteria possessing a curved-rod shape

Diplobacillus is a rod-shaped bacterium occurring in pairs linked end to end.

Correct option: B
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Question 18
A
Fluke
B
Nematode
C
Bacteria
D
Volvox
Explanation
A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms (fluke, planaria)

Flame cells function like a kidney, removing waste materials.
Excretion of ammonia waste through the body wall, and is not associated with any specific organs

Correct option: A
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Question 19
A
Family
B
phylum
C
community
D
group
Explanation
Food chain refers to the sequence of transfers of matter and energy in the form of food from organism to organism. Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant. Plants, which convert solar energy to food by photosynthesis, are the primary food source. In a predator chain, a plant-eating animal is eaten by a flesh-eating animal. In a parasite chain, a smaller organism consumes part of a larger host and may itself be parasitized by even smaller organisms.

In a saprophytic chain, microorganisms live on dead organic matter.

Correct option: C
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Question 20
A
cow
B
pig
C
sheep
D
dog
Explanation
It is transmitted to pig through human feaces or contaminated vegetation contaminated with human excreta.

Correct option: B

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