Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Make a labelled diagram of Balanoglossus. Write five characteristics of phylum Hemichordata.

Describe the factors affecting enzyme activity.

With the help of suitable diagrams describe mitosis.

Describe briefly the four major groups of Protozoa.

Schematically represent primary, secondary and tertiary structures of a hypothetical polymer say for example a protein.

Briefly describe the structure of brain.

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

The male and female reproductive organs of several pteridophytes and gymnosperms are comparable to floral structures of angiosperms. Make an attempt to compare the various reproductive parts of pteridophytes and gymnosperms with reproductive structures of angiosperms.

Sonali, a 7 years old girl was roaming in the garden, when she saw a butterfly hovering over a flower. She was attracted to the flower and plucked it. On coming back home, she showed it to her brother (a biology graduate student) who scolded her for her action. He explained the importance of flowers for the plants and insects like butterflies honeybees, etc. Sonali realised her mistake and immediately promised not to repeat įt.

1. What is the importance of flower?
2. How are insects attracted to flowers?
3. Name the different parts of a flower.
4. What values are displayed by Sonali?