Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

Differentiate between integral and peripheral proteins of plasma membrane.

When a substrate is being metabolised, why does not all the energy that is produced get released in one step? It is released in multiple steps. What is the advantage of stepwise release?

Why is closed circulatory system more efficient than the open system?

How do the ribosomes of prokaryotic cells differ from the ribosomes of eukaryotic cells? Also tell what is similar about them?

Mention four characteristics of metabolic pathways.

Mention two conditions under which photorespiration may occur in green plants.

How is phellem different from phelloderm?

A farmer adds/ supplies Na, Ca, Mg and Fe regularly to his field and yet he observes that the plants show deficiency of Ca, Mg and Fe. Give a valid reason and suggest a way to help the farmer improve the growth of plants.

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?

What is the habitat of ferns. Describe their plant body. Explain the nature of spores ferns have. List out some common ferns.