4
Q:

Biological control is to check growth of 

A) plants B) animals
C) weeds D) one pest by another

Answer:   D) one pest by another



Explanation:

Biological Control: This method is very effective. One pest is destroyed by another organism. For example the aphids are killed by lady beetle. The prickly pear is eradicted by cochineal insect. Here the advantage is, one does not use harmful chemicals which may get into the host plants.

Subject: Biology
Q:

Which of these is the energy conversion that happens in the process called photosynthesis?

 

A) Potential energy to chemical energy   B) Light energy to chemical energy  
C) Heat energy to chemical energy   D) Heat energy to light energy  
 
Answer & Explanation Answer: B) Light energy to chemical energy  

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3 1095
Q:

The plant hormone that helps in the growth of the stem is ...........

 

A) Gibberellins B) Cytokinins
C) Auxins D) Insulin
 
Answer & Explanation Answer: C) Auxins

Explanation:
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4 1201
Q:

The pressure variations inside the inner ear are turned into electrical signals by the:

 

A) Cochlea B) Hammer
C) Stirrup D) Anvil
 
Answer & Explanation Answer: A) Cochlea

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1 3172
Q:

What is the straight tube, about 40 cm long, that carries sperms to the seminal vesicles, called?

 

A) Urethra B) Penis
C) epithelial D) connective
 
Answer & Explanation Answer: C) epithelial

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3 1619
Q:

Xylem is a/an ......... tissue.

 

A) simple permanent B) complex permanent
C) epithelial D) connective
 
Answer & Explanation Answer: B) complex permanent

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2 404
Q:

The carpel contains ............

 

A) Pollen grains B) Sepals
C) Petals D) Ovules
 
Answer & Explanation Answer: D) Ovules

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2 697
Q:

Chiropody is a branch of science related to which part of the body?

 

A) Liver B) Kidney
C) Feet D) Lungs
 
Answer & Explanation Answer: C) Feet

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3 2877
Q:

Pernicious anaemia is caused by the deficiency of vitamin .......

 

A) B2 B) B6
C) B1 D) B1
 
Answer & Explanation Answer: D) B1

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1 1440