Sample Paper 2006

Biology

CLASS :XI

Time   :  3hrs                                                          Marks :  70

Question nos 1-5 carry one mark each

  Question nos 6-15 carry two marks each

  Question nos 16-25 carry three marks each

       Question nos 26 -28 carry five marks

Answer the following:-

SECTION   A

1. Two homologous chromosomes are brought together through a characteristics ladder like structure called

1. Why did Mendel selected pea plant for his experiment? Write two reasons.

1. Write any one practical application of human blood typing.

1. How many chromosomes characterize the Down Syndrome?

1. Write the name of the book written by Theophrastus

SECTION    B

1. Differentiate between differentiated and dedifferentiated cells.

1. Why is meiosis essential in sexually reproducing organisms?

1. ‘Potato is a stem and sweet potato is a root’ justify the statement.

1. Write a brief note on waxes.

1. Describe various types of placentation found in flowering plants.

1. Define test cross and reciprocal cross.

1. What is aneuploidy? Give one example.

1. How is pinnocytosis differ from phagocytosis?

1. What do you mean by phyllotaxy and placentation?

1. Describe the main features of pteridophytes.

or

            What are transgenic animals? Give an example

SECTION  C

1. How would you distinguish monocot from dicot anatomically?