Subject

Biology

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsShort Answer Type

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1.

How do the pollen grains of Vallisneria protect themselves? 


Vallisneria being a water pollinated species protect their pollen grains by having a mucilaginous coat. The coat prevents the pollen grains from getting wet.
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2.

Name the respective pattern of inheritance where F1 phenotype

(a) does not resemble either of the two parents and is in between the two.

(b) resembles only one of the two parents.

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3.

Write the name of the following: 

(a) The most common species of bees suitable for apiculture

(b) An improved breed of chicken

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4.

Mention the role of cyanobacteria as a biofertiliser. 

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5.

How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans? 

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6.

Where is acrosome present in humans? Write its function

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7.

State the significance of Coelacanth in evolution. 

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8.

Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters?

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9.

(a) Where do the signals for parturition originate from in humans?

(b) Why is it important to feed the newborn babies on colostrums? 
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10.

Given reasons for the following: 

(a) The human testes are located outside the abdominal cavity.

(b) Some organisms like honey-bees are called parthenogenetic animals.

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