PART - 2 - Unit V : CH - 16 Excretory Products and Their Elimination — BIOLOGY STD 11 Science — Question

Answer the following with reference to the anatomy of monocot stem How are the vascular bundles arranged? How are the xylem vessels arranged in each bundle? What do you call such an arrangement? Vascular bundles are closed ones. What type of tissue is lacking in them?

What is the significance of step-wise release of energy in respiration?

Amrita's biology teacher taught in biology class that food helps in building the body and alsoprovides us energy to work. However, she was not able to understand the mechanisms involved. So, she discussed it with his father who is a professor of biology in a college. He answered that in living organisms certain structures, present in the cells and known as power houses of cells, which are responsible for conversion of food into energy. Read the above passage and answer the following questions.

1. Which cell organelles are known as power house of cell? Why?
2. List major components of mitochondrion.
3. What values are displayed by Amrita's father?

Enlist the demerits of an artificial system of classification of plants.

Write the features that distinguish between the two open and closed circulatory system.

Mention breifly about the circulatory system of earthworm.

Demonstrate and explain the formation of annual ring in the transverse section of the stem.

What is the basic body plan of animals?

1. Name the end products of fermentation.
2. Write the role of oxygen in the electron transport system.
3. What is respiratory quotient? What is the RQ for fat?

Give reason for each of the following:

1. The vascular bundles of an isobilateral leaf are near similar in size, except that in the midrib.
2. Heart wood is dark brown in colour.
3. Cells of phellem/cork are impervious to water.
4. Quantity of secondary xylem produced is more than the quantity of secondary phloem during secondary growth.
5. Phellogen is a secondary meristem.