Sample Paper for CBSE Biology Class 12

11/29/2011 CBSE


Max Marks –
Time – 1 hour

  • Q.01 to Q.10 (1 marks)
  • Q.11 to Q.13 (2 marks)
  • Q.14 to Q.16 (3 marks)
  • Q.17 to Q.18 (5 marks)


Q .1Both tap worm & earthworm are hermaphrodites. How do they
differ from each other with reference to fertilization?

Q.2 Pick out the monoceious plant from the following:
B) Mulberry
C) cucumber
D) Date palm.

Q.3 Give An example of dioceious plants.

Q.4 Why are cucurbits refers to as monoceious?

Q.5 Why are date palm refers to as dioceious?

Q.6 Name the plants in which isogamy occurs?

Q.7 Why is reproduction essential for an organism.

Q.8 What is meiocytes?

Q.9 What is meant by homothelic.

Q.10 What is meant by juvenile phase of an organism?

Q.11 What is the mode of asexual reproduction in I) Yeast II) Amoeba
III) Hydra IV) Sponges.


Name the method of vegetative reproduction in the

i) Roses
ii) Sugarcane
iii) Bougainvillea

iv) Money plant
v) Straw berry

Q.12 Give the chromosomes no. in the gametes of the following, if the
no. of chromosome in their meiocyte is as follows:
I) Dog – 78

II) House fly – 12
III) Rice – 24
IV) Onion-32.

Q.13 What do the following parts of the flower develop into after
I) Ovary
II) Zygote
III) Ovary wall

Q.14 Identify each part in the flowering plant & write whether it
is n OR 2n.
I) Ovary
II) Anther
III) Egg
IV) Pollen

V) Male gamete
VI) Zygote.

Q.15 Draw the diagram of gemmule of a sponge & labeled 4

Q.16 Differentiate b/w external fertilization & internal
fertilization with an example.

Q.17 What are vegetative propagules? Name any 4 of them along with

Q.18 Name the three phases in sexual reproduction of an organism
& Mention what major events occur in each of them.

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