Digestion and Absorption — BIOLOGY STD 11 Science — Question

Gills of fish are red in colour. Why?

Define a taxon?

The following statements describe the four main stages in the process of mitosis.

1. The spindle fibres breakdown and the nuclear membrane forms.
2. The chromosomes arrange themselves on the equator of the cell.
3. The spindle forms and the nuclear membrane disintegrates.
4. The centromere splits and the sister.

chromatids migrate to the opposite poles of the cell. Write the correct sequence of the stages in mitosis and also name the each stage.

Which nerve tract connects the right and left ny hemispheres of the cerebrum? Name the four lobes of hemisphere of brain?

What is the grass-green colour of green algae due to?

What is the difference between alternate and opposite types of phyllotaxy?

Enumerate the condition when discoloration of skin and white portion of eye takes place.

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

Urine becomes hypertonic as it flows through the descending limb of Henle's loop. Justify.

Why are flowers of cucurbits referred to as epigynous?