Biological Classification — BIOLOGY STD 11 Science — Question

Approximately how many Islets of Langerhans are present in a normal human pancreas?

From whose seeds was Zeatin released?

What is the nature of nerve impulse?

Correct the following statements by deleting one of entries (given in bold). Saliva contains enzymes that digest starch/ protein.

What is the name of pigments present in Chlorophyceae?

The rice seedlings infected with fungus Gibberlla fujikuroi is called foolish seedlings? What was the reason behind it?

What kind of muscle fibres are richly found in the extensor muscles of the back? What characteristics enable these fibres to serve their purpose?

A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant growth regulator can be applied to achieve this?

Write the name of any two medicinal plants of Solanaceae family.

Which hormone stimulates root growth and root hair?