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Q:

The main buffer system of the human blood is

A) H2CO3 B) H2SO4
C) CO2 D) O3
 
Answer & Explanation Answer: A) H2CO3

Explanation:

the_main_buffer_system_of_the_human_blood_is1556690852.jpg image

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Q:

What organelle allows some protists to detect light?

Answer

An organelle called Eyespot allows some protists to detect light. It allows the cells to sense light direction and intensity and respond to it by swimming either towards the light (positive phototaxis) or away from the light (negative phototaxis).


 


Eyespot is a photoreceptive organelle found in the flagellate or (motile) cells of green algae and other unicellular photosynthetic organisms such as euglenids.


 


Eyespot-mediated light perception helps the cells in finding an environment with optimal light conditions for photosynthesis. Eyespots are the simplest and most common "eyes" found in nature, composed of photoreceptors and areas of bright orange-red pigment granules.

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Q:

The First step of Bacterial Replication is

A) Pinching of the plasma membrane B) Separation of daughter cells
C) Attachment of the DNA to the plasma membrane D) DNA Replication
 
Answer & Explanation Answer: D) DNA Replication

Explanation:

The First step of Bacterial Replication is DNA Replication.

DNA must be copied in order to proceed.

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Q:

Which shows the order in which vertebrates evolved?

 

 

A) fish, reptiles, amphibians, birds, mammals   B) amphibians, fish, reptiles, birds, mammals  
C) amphibians, fish, birds, reptiles, mammals   D) fish, amphibians, reptiles, birds, mammals
 
Answer & Explanation Answer: D) fish, amphibians, reptiles, birds, mammals

Explanation:
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Q:

Human Heart is made up of

A) nervous tissue B) cardiac muscle
C) nonstriated muscle D) connective tissue
 
Answer & Explanation Answer: B) cardiac muscle

Explanation:
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Q:

Spices detoriate after prolonged boiling

A) The essential oils in the spices easily evaporate B) Spices are put in the pickels to add to the flavour
C) Both A and B D) None
 
Answer & Explanation Answer: A) The essential oils in the spices easily evaporate

Explanation:
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Q:

Man has...............pairs of salivary glands

A) 4 B) 6
C) 3 D) 8
 
Answer & Explanation Answer: C) 3

Explanation:

Salivary glands of man are 3 pairs = 6. They are one pair of parotid glands, one pair of submaxillary or submandibular glands and one pair of sublingual glands.

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Q:

Which of the following would cause gene flow?

A) Individuals moving into population B) Genetic drift
C) Mutation D) Artificial selection
 
Answer & Explanation Answer: A) Individuals moving into population

Explanation:

Gene flow means migration of genes from one to another. This gene flow is caused by individuals moving into population.

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