Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Why is the colour of a leaf kept in the dark frequently yellow, or pale green? Which pigment do you think is more stable?

Differentiate between rods and cones.

Neha was walking in the garden early morning and observed many beautiful flowering plants. She got attracted by the brightly coloured flowers and their beautiful appearance. Neha was curious to know about the variation of colours in flowers and asked her biology teacher about this. Teacher told her about the plastids found in only plant cells.

1. Which plastids are found in flowers and fruits?
2. Which plastids are known as kitchen of the cell?
3. Name the colourless plastids.
4. What values are shown by Neha?

Photosynthesis not only facilitates production of food but also cleans up the environment. Which of the following is similar to this multipronged effect of photosynthesis? Explain how deforestation affects our environment.

1. An automobile not only carries people but also releases carbon dioxide in the air.
2. A cow not only gives milk but also produces methane which is a greenhouse gas.
3. A cow not only gives milk but also produces cowdung which can be used as kitchen fuel.

Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.

What are the main steps in aerobic respiration? Where does it take place?

Suppose for some reason ATP falls deficient in nerve fibre, how will it affect the conduction of nerve impulse through it?

Briefly describe the structure of the Brain.

Take one flower of the family Solanaceae and write its semi-technical description. Also draw their floral diagram.

Write an account on skeleton of sponges.