Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Write four important functions of hormones.

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.

Mention the causative factors for indigestion.

Which tissue of animals and plants exhibits meiosis?

Classify vascular bundles on the basis of the position of the protoxylem.

Write a few lines about Gout.

While teaching about the chemistry of life, teacher emphasised that carbohydrates, fats, proteins, vitamins and minerals are important for life in addition to water. Akash was under the impression that fats are not good for body and high cholesterol content generally causes heart related and other problems. Therefore, he asked his father who is a doctor about the role of fats in living organisms.

1. What are fats?
2. What is the average percentage of fats present in a cell?
3. How many fatty acid residues are found in one molecule of fat?
4. What values are indicated from Akash's character?

Give the scientific terms for the following:

1. A protein found in milk that forms curd, it tends to be difficult for infants to digest.
2. A lymphatic vessel in an intestinal villi, it aids in the absorption of fats.
3. Sphere formed by bile salts that surround lipids to make them temporarily water soluble.
4. Fine microscopic, finger-like projections lining the small intestine that serves to increase, the absorptive surface area.

1. Do bacterial cells have nucleus like eukaryotic cell? Explain.
2. Are there any form of bacteria present that are made up of more than one cell?

Write the functions of medulla oblongata.