Biology (2017) | Study Mode

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Question 31
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 32
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 33
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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Question 34
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 35
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 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
Chloroplasts
B
Ribosomes
C
Cytoplasm
D
Mitochondria
Explanation
Chloroplast is the combination of two biological terms, plastid (an organelle in a plant cell), and chloros, which means green. chlorophyll which is an important pigments for photosynthesis.

A ribosome is a complex cellular mechanism used to translate genetic code into chains of amino acids. Long chains of amino acids fold and function as proteins .

The jellylike material that makes up much of a cell inside the cell membrane, and, in eukaryotic cells, surrounds the nucleus.

Mitochondrial is a spherical or elongated organelle in the cytoplasm of nearly all eukaryotic cells, containing genetic material and many enzymes important for cell metabolism, including those responsible for the conversion of food to usable energy

Correct option: A
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Question 38
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 39
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 40
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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