Mention the role of cyanobacteria as a biofertiliser.  from Cl

Subject

Biology

Class

CBSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

How do the pollen grains of Vallisneria protect themselves? 

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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. 


Cyanobacteria such as Anabaena and Nostoc are free-living and help fix atmospheric nitrogen and act as bio-fertilizers especially in paddy fields.

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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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