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Question 21
A
Green plants  
B
fungi  
C
Algae  
D
Bryophytes 
Explanation.
Share Answer 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 23
A
Adrenalin  
B
Vitamin A  
C
Insulin  
D
Thyroxin 
Explanation.
Share Answer (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.
Share Answer 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 26
A
Hydra  
B
Taenia Spp  
C
Ascaris  
D
Earthworm 
Explanation.
Share Answer 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.
Share Answer Larmack’s 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 29
A
Birth-rate  
B
Frequency  
C
Mortality  
D
Density 
Explanation.
Share Answer 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.
Share Answer

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


Correct Option:
A

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