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

Nitrogen-fixation is shown by prokaryotes and not by eukaryotes. Comment.

During the group study at Vishalthi's home, Anil got a severe pain in his stomach. Vishakha called her mother immediately as she (mother) was a doctor. After diagnosis, stone is found in her kidney. She gave him some medicines and also suggested to drink a lot of water, so that the stone related problem does not arise again.

1. What is the medical term used for the stone in kidney?
2. Way should we drink a lot of water on the regular basis?
3. Name the ions which are involved in the formation of renal stones?
4. What values did vishakha’s mother possess?

Write short notes on the functions of the following hormones:
Parathyroid hormone (PTH)

What is partial pressure of a gas?

What is common in whale, bat and rat?

1. Absence of neck.
2. Muscular diaphragm between thorax and abdomen.
3. Extra-abdominal testes to avoid high temperature of body.
4. Presence of external ears.

Explain some natural means of overcoming seed dormancy.

How does cambium ring form in a dicot stem?

Differentiate between ascending limb and descending limb of Henle's loop.

Trypsin acts at an alkaline pH. What provides this alkalinity? Give the two actions of trypsin.

Draw a labelled diagram of the adrenal gland and section showing two parts of adrenal gland.