PART - 2 - Unit V : CH - 18 Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Draw the floral diagram of Liliaceae and write its floral formula. Write two major differences between the flowers of this family and those of Solanaceae.

When and where does reduction division take place in the life cycle of a liverworts, a moss, a fern, a gymnosperm and an angiosperm?

Mention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot, leaf cell of a moss; prothallus cell of a ferm; gemma cell in Marchantia; meristem cell of monocot, ovum of a liverwort, and zygote of a fern.

Explain the process of secondary growth in the stems of woody angiosperms with the help of schematic diagrams. What is its significance?

Describe different types of joints in the human skeleton.

Why are xylem and phloem called complex tissues?

Mention any five functions performed by essential elements in plants.

Write short notes on following:

1. Malpighian tubules.
2. Excretion in Frogs.
3. Economic importance of cockroach.
4. Glandular Epithelium.
5. Neuron.

In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a, answer the following:

1. What does the action spectrum indicate? How can we plot an action spectrum? Explain with an example.
2. How can we derive an absorption spectrum for any substance?
3. If chlorophyll a is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap?

Water is indispensable for life. What properties of water make it useful for all biological processes on the earth?