Biology (2017) | Study Mode

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Question 41
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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Question 42
A
variation
B
genetics
C
mycology
D
natural selection
Explanation
Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance.

He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.

Correct option: B
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Question 43
A
body surface
B
gills
C
buccal cavity
D
spiracle
Explanation
Protozoa do not have any organellae for the process of respiration. The limiting permeable membrane (body surface) acts as a respiratory surface.

The free molecular oxygen from the surrounding media enters into the body by diffusion. Presence of a cytochrome system has been demonstrated in protozoa.

Correct option: A
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Question 44
A
plants build-up organic compounds
B
plants absorb mineral salts
C
sugars are completely broken down in animals
D
there is thunderstorm
Explanation
Plant build of of organic compounds such as oil, coal and gas is a great source of emission of carbon dioxide into the atmosphere
Human activities such as the burning of oil, coal and gas, as well as deforestation are the primary cause of the increased carbon dioxide concentrations in the atmosphere.
Other source such has respiration by animals, thunderstorm release carbon dioxide in smaller quantities compare to 87% of carbon dioxide emission from plants build-up organic compounds through human activities

Correct option: A
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Question 45
A
pig and snail
B
pig and sheep
C
sheep and snail
D
pig
Explanation
Liver fluke (Fasciola hepatica) is a parasite affecting a range of livestock and other species. Final hosts in which it can develop to sexual maturity include livestock such as sheep, cattle, horses, pigs, goats, alpacas and deer. People can be infected by eating water cress growing along creeks in fluke-infested country

Correct option: B
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Question 46
Biology (2017) Q 46 image
A

carpel

B

sepal

C

petal

D

stamen

Explanation

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


Correct option: D
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Question 47
A
Immigration
B
edaphic
C
predation
D
mutualism
Explanation
Predation include all interactions in which one organism consumes all or part of another. This includes predator-prey, herbivore-plant, and parasite-host interactions.

Migration is the movement of individuals of a species from one place to another.
Mutualism is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other.

Edaphic factor is an abiotic factor relating to the physical or chemical composition of the soil found in a particular area.

Correct option: C
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Question 48
A
root hairs
B
rhizoids
C
capsule
D
hyphae
Explanation
Mosses do not have a proper roots, but have threadlike rhizoids that anchor them to their substrate.

Rhizoids absorb water by capillary action, in which water moves up between threads of rhizoids and not through each of them as it does in roots.

hyphae are also important in the reproductive process in that they produce new spores while root hairs are important for the uptake of nutrients

Correct option: B
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Question 49
A
It lowers the activation energy of the reaction, increasing the reaction rate.
B
It raises the activation energy of the reaction, decreasing the reaction rate.
C
It lowers the activation energy of the reaction, decreasing the reaction rate.
D
It raises the activation energy of the reaction, increasing the reaction rate.
Explanation
Enzymes lower the activation energy of a reaction, increasing the reaction rate.

Correct option: A
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Question 50
A
crickets
B
cockroach
C
grasshopper
D
bees
Explanation
The first stage of incomplete metamorphosis is the egg. During this time, the insect will hatch into a form called a nymph.

The nymph is basically a small version of the adult insect.

Correct option: D

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