Biology (2017) | Study Mode

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Question 21
A
half inferior ovary
B
superior ovary
C
inferior ovary
D
half superior ovary
Explanation
A superior ovary is an ovary attached to the receptacle above the attachment of other floral parts
A half-inferior ovary is embedded or surrounded by the receptacle.

An inferior ovary lies below the attachment of other floral parts.

Correct option: B
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Question 22
A
Volvox
B
paramecium
C
euglena
D
chlamydomonas
Explanation
Volvox is an example of organism thatforms spherical colonies of up to 50,000 cells.
A colony is composed of two or more individuals living in close association with, or connected to, one another, usually for mutual benefit such as stronger defense or the ability to attack bigger prey.

It is a cluster of identical cells (clones) on the surface of (or within) a solid medium, usually derived from a single parent cell.

Correct option: A
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Question 23
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 24
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 25
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 26
A
Holozoic
B
parasitic
C
saprohytic
D
carnivores
Explanation
Parasitic nutrition is heterotrophic nutrition where a parasitic organism lives on the body surface or inside the body of another type of organism (a host) and gets nutrition directly from the body of the host. Since these parasites derive nourishment from their host, this symbiotic interaction is often described as harmful to the host.
Saprotrophic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of decayed organic matter.

The organism feeds on dead matter i.e fungi
A carnivore is an organism that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of animal tissue, whether through predation or scavenging

Correct option: B
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Question 27
A
acquired
B
heritable
C
sex-linked
D
morphological
Explanation
PTC(phenylthiocarbamide) has the unusual property that it either tastes very bitter or is virtually tasteless, depending on the genetic makeup of the taster. The ability to taste PTC is often treated as a dominant genetic trait, although inheritance and expression of this trait are somewhat more complex.

To some people, small amounts of the compounds phenylthiocarbamide (PTC) taste very bitter; other people do not taste these compounds. The myth is that there are only two kinds of people, tasters and non-tasters, and that the trait is controlled by a single gene, with the allele for tasting dominant over the allele for non-tasting.
? ability to taste PTC in some individuals is a character that is heritable

Correct option: B
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Question 28
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 29
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 30
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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