Biology | Study Mode

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Question 21
A
Green plants
B
fungi
C
Algae
D
Bryophytes
Explanation.
Moulds are saprophytes, they feed on the dead bodies of plant or organic materials like bread. They therefore pass out enzymes from their cells on to the substrate (the material in which they feed) to make it soluble, this kind of digestion occurring outside the organisms called Extracellular digestion (A).

Correct Option:
A
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Question 22
A
Millions test
B
Fehlings solution
C
Sudan III solution
D
Iodine solution
Explanation.
Starch turns iodine solution blue black (D).

Correct Option:
D
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Question 23
A
Adrenalin
B
Vitamin A
C
Insulin
D
Thyroxin
Explanation.
(D) Thyroxine is complex compounds which include iodine. An animal not producing enough becomes slow, may not grow to its proper size (cretinism)

Correct Option:
D
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Question 24
A
possession of we skin
B
possession of webbed limbs
C
replacement of gills with lungs
D
development of lung hint limber
Explanation.
Amphibians use gill for gaseous exchange in aquatic environment while the gill is changed to lungs in Terrestial habitat (C).

Correct Option:
C
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Question 25
A
species
B
genus
C
family
D
order
Explanation.
Correct Option:
A
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Question 26
A
Hydra
B
Taenia Spp
C
Ascaris
D
Earthworm
Explanation.
Diploblastic animals have two cell layer in their body wall, an outer layer (ectoderm) and an inner endoderm e.g Coelentrates (Hydra) (A).

Correct Option:
A
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Question 27
A
Mendel
B
Lamark
C
Morgan
D
Luther
Explanation.
Larmacks theory states that when an organism develops a need for a particular structure, this induce its appearance (B).

Correct Option:
B
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Question 28
A
Amoeba
B
Protozoa
C
Virus
D
Protists
Explanation.

No official Explanation yet!


Correct Option:
C
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Question 29
A
Birth-rate
B
Frequency
C
Mortality
D
Density
Explanation.
Population density is the average number of individuals of a species per unit area of the habitat (D).

Correct Option:
D
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Question 30
A

Antibacterial

B

Neurosepoys

C

Thizobium

D

Clostridium

E

Nitrosomonas

Explanation.

Nitrosomonas first convert ammonia to Nitrites (NO,)while Nitrobacter completes the conversion to Nitrates (NO3)


Correct Option:
A

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