Morphology of Flowering Plants — BIOLOGY STD 11 Science — Question

Give a brief account of mechanism of vision.

What is the significance of meiosis?

What is photoperiodism? How do you categorise the angiosperms on the basis of their flowering response to photoperiod? Explain with the help of neat and well-labelled diagram.

There are 26 bones in the vertebral column of a human adult. Categorise them on the basis of their location and mention the specific number in each of the categories.

Define a taxon. What is meant by taxonomic hierarchy. Give a flow diagram from the lowest to highest category for a plant and an animal. What happens to the number of individuals and number of shared characters as we go up the taxonomical hierarchy?

How do you prepare your own herbarium sheets? What are the different tools you carry with you while collecting plants for the preparation of a herbarium? What information should a preserved plant material on the herbarium sheet provide for taxonomical studies?

Lakshita was studying endocrine system for her unit test. She was confused how hormones produce their effects on the target tissue. She read many times, but still did not understand the process. She asked the same to her neighbour Stuti, a biology teacher in a school. Stuti explained her about the hormone receptor complex through diagrams and flowcharts.

1. Name the two types of receptors.
2. Why do different hormones use different types of receptors?
3. What are second messengers? Give two examples?
4. What values reflect from Lakshita's character?

Trace the events starting from the coming in contact of Rhizobium to a leguminous root till nodule formation. Add a note on importance of leghaemoglobin.

Differentiate between Aerobic respiration and Fermentation.

Describe the mechanism of gaseous transport In humans.