Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Name the part of the alimentary canal, where major absorption of digested food takes place. What are the absorbed forms of different kinds of food materials?

Answer briefly: How does bile help in the digestion of fats?

Lalit, student of class XI always likes to have junk food. His mother insists him to have fibre rich fruits and vegetables, because they are good for health. Lalit always ignored his mother's advise. One day, while his biology teacher was teaching about the digestive system and mechanism of digestion. She also explained about the food one should eat (Le., balanced diet) Lalit remembered his mother's advice and asked his teacher about the importance of fibre rich food in one's diet.

1. According to you, what is the advantage of having fibrous material in our food?
2. Name the term used to describe fibrous materials which is indigestible in nature.
3. Name any four fibre rich fruits.
4. What values are reflected through Lalit's character?

Comment hormones are called informational molecules.

Coelom is a cavity between the body wall and alimentary canal and is lined by:

1. Ectoderm and endoderm.
2. Ectoderm and mesoderm.
3. Endoderm on both sides.
4. Mesoderm on both sides.

1. What is meant by apical dominance? Name the phytohormone which controls it.
2. How does abscisic acid act as a stress hormone in drought condition?

Give scientific reasons for the following.

1. Animal cells rupture when placed in distilled water.
2. Plant cells get plasmolysed when placed in hypertonic solution.

Crocodile and Penguin are similar to Whale and Dogfish in which one of the following features?

1. Lay eggs and guard them till they hatch.
2. Possess bony skeleton.
3. Have gill slits at some stage.
4. Possess a solid single stranded central nervous system.

Justify that lichens are the pioneer organisms.

Mention the two categories of hypothalamic hormones and their functions. Give one example of each.