Biology (2017) | Study Mode

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Question 31
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 32
Biology (2017) Q 35 image
A

omnivores

B

herbivores

C

canivores

D

omnivores and canivore

Explanation

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


Correct option: A
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Question 33
A
sperm
B
egg
C
embryo
D
zygote
Explanation
Human fertilization is the union of a human egg and sperm, usually occurring in the ampulla of the fallopian tube.

The result of this union is the production of a zygote cell, or fertilized egg, initiating prenatal development.

Correct option: D
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Question 34
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 35
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 36
A
birds and reptiles
B
fishes and birds
C
reptiles and fishes
D
birds and molluscs
Explanation
Its long been recognized that birds and reptiles share many characteristics:

Both have skulls that abut the first neck vertebra with a single ball-and-socket joint.

Both birds and reptiles excrete nitrogenous wastes as uric acid; mammals excrete urea, fish ammonia.

Both lay similar highly yolked eggs
Bird feather is homologous to the reptile scale. Both develop from an epidermal elevation over a nourishing dermal core. Scales flatten, feather buds roll into a cylinder shaped tube

Correct option: A
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Question 37
A
to complement gills while in water
B
to complement gills while on land
C
while on land
D
while in water
Explanation
Lungfish are best known for retaining the ability to breathe air, to survive drought

Correct option: D
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Question 38
A
Oxygen exchanging between red blood cells and liver cells
B
Carbon dioxide exchanging between muscle cells and red blood cells
C
Water moving out of the small intestine
D
Sodium being reabsorbed in the kidney
Explanation
Although sodium ions are small, their charge prevents them from moving across the cell membrane through simple diffusion. They must be transported using active transport.

Correct option: A
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Question 39
A
replacement of the gills with lungs
B
possession of webbed limbs
C
limbs
D
possession of tympanic membrane
Explanation
Amphibians display some interesting and changing characteristics as they metamorphose through various forms on their way to adulthood. The frog, for instance, begins life underwater as a larva with gills and becomes and air-breather with lungs as an adult.
&therefore4; in case of draught, frog can amphibians can use lungs to breathe on land

Correct option: A
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Question 40
A
white blood cell
B
red blood cells
C
phagocytes
D
leucocytes
Explanation
A red blood cell(erthyrocytes), which (in humans) is typically a biconcave disc without a nucleus.

Erythrocytes contain the pigment haemoglobin, which imparts the red colour to blood, and transport oxygen and carbon dioxide to and from the tissues.

Correct option: B

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