MODEL PAPER 2 — BIOLOGY STD 11 Science — Question

What is consciousness and which are the stimuli for living things to become conscious?

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

What is called amphibolic path? Write any four differences between Respiration and Photo-synthesis.

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.

What are plant growth regulators? Name any four different chemical nature of them with one example of each.

Which important pulses belong to family Fabaceae? Give also their scientific names.

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?

Write the appropriate type of tissues in Column B according to the functions mentioned in Column A.

1. Secretion and absorption __________.
2. Protective covering ____________.
3. Linking and supporting framework ____________.

To get a carpet like grass lawns are mowed regularly. Is there any scientific explanation for this?

Describe three reasons for the generation of a proton gradient between the lumen of thylakoids and the stroma of chloroplasts.