Respiration In Plants — BIOLOGY STD 11 Science — Question

Classiafy and describe epithelial tissue on the basis of structural modifications of cells.

Who proposed the five kingdom classification? Describe their characteristics by making a table.

Write short note on synapse.

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

Amit went on mountain for trekking. After reaching at about 2000 m height. He experienced difficulty in breathing. His rate of breathing increased and he decided to discontinue the trek and return back to the ground. Being concerned about his health. ls consulted his doctor friend about it? His friend explained that it is a normal phenomenon and he should have carried an oxygen cylinder while going for the trek.

1. Why is it difficult to breathe as we go up on a height?
2. Why does his friend suggested to carry an oxygen cylinder?
3. Which component of blood show its increase when someone moves from plains to higher altitudes?
4. What values are shown by Amit?

Describe modifications of stem with suitable examples.

Write the differences between: Open and Closed system of circulation.

Explain the process of the transport and release of a neurotransmitter with the help of a labelled diagram showing a complete neuron, axon terminal and synapse.

Distinguish anaphase of mitosis from anaphase I of meiosis.

Give a brief account of the counter current mechanism.