Cell The Unit of Life — BIOLOGY STD 11 Science — Question

(i) Renin hormone is secreted by which cells? Write one function of it.
(ii) Make a labelled diagram of the longitudinal section of the kidney.

Describe the light harvesting complexes of photosystems.

Differentiate between ureotelism and ammonotelism.

Write short notes on:

1. Importance of carbon fixation by algae.
2. Importance of Gymnosperms.
3. Importance of Angiosperms.
4. Medicinal Use of Algae.

Give a schematic diagram showing basic architecture of a chordate.

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

Distinguish between blind spot and yellow spot.

How are tracheids different from vessels found in angiosperms? Give a labelled sketch of each of them.

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?

The glomerular filtrate in the loop of Henle gets concentrated in the descending limb and then gets diluted in the ascending limb. Explain.