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

Attempt titrating an amino acid against a weak base and discover the number of dissociating ( ionizable ) functional groups in the amino acid.

State economically important uses of: archaebacteria

Which one of the following statements is incorrect?

1. In cockroaches and prawns excretion of waste material occurs through malpighian tubules.
2. In ctenophores, locomotion is mediated by comb plates.
3. In Fasciola, flame cells help in excretion.
4. Earthworms are hermaphrodites and yet cross fertilization take place among them.

Name the types of classification of plants. Describe any one.

What is heterophylly?

Mention the four important events/ processes associated with the photochemical phase or light reaction of photosynthesis.

If alpha and beta cells in the Islets of Langerhans of the pancreas are rendered inactive in an individual, explain the affected processes in the organism.

Write the meaning of these terms.

1. Lignocolous.
2. Saxicolous.
3. Certicolous.
4. Terricolous.

Fish which can be used in biological control of mosquitoes/ larvicidal fish is:

1. Eel.
2. Carp.
3. Cat fish.
4. Gambusia.

Differentiate between the female gametophyte of angiosperms and that of gymnosperms.