Algae are useful because they

• are large in number

• are used in alcoholic fermentation

• purify the atmosphere

• are used in curdling of milk.

Which of the following Phyla are included in Enterozoa?

• Annelida, Mollusca, Porifera

• Echinodermata, Hemichordata, Porifera

• Mollusca, Arthropoda, Hemichordata

• Porifera, Mollusca, Arthropoda

If turgor pressure becomes equal to the wall pressure, then

• water leaves the cell

• water enters the cell

• no exchange of water takes place

• solute goes from the cell into water

In Entamoeba histolytica, the presence of chromatid bodies is characteristic of

• precystic stage

• mature quadrinucleate stage

• trophozoite stage

• mature binucleate stage

The plant body of moss (Funaria) is

• completely sporophyte

• predominantly sporophyte with gametophyte

• completely gametophyte

• predominantly gametophyte with sporophyte

Non-cellular layer that connects inner surface of the epithelial tissue to the connective tissue is

• basement membrane

• epidermis

• dermis

• either (b) or (c).

Hydra receives impulses and stimuli through

• nerve net

• nematocytes

• sensory cells

• flame cells

Which of the following structures helps in the respiration of lichens?

• Soredia

• lsidia

• Cyphella

• Cephalodia

Passage cells are found in

• dicot stem

• monocot root

• monocot stem

• all of these

The sites of the first, second and third moulting of the Ascaris larva are respectively

• soil, lung and intestine

• liver, stomach and intestine

• soil, alveoli and alveoli

• soil, intestine and lung