Multiple Choice Questions

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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


C.

no exchange of water takes place

Turgor pressure is the pressure that develops in a cell from time to time due to osmotic diffusion of water molecules into a cell resulting in the stretching of cell wall. Due to turgor pressure, rigid cell wall offers resistance. This resistance works in a direction opposite to turgor pressure. But it is equal to turgor pressure and is called wall pressure. In this condition, no exchange of water takes place.


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Algae are useful because they

  • are large in number

  • are used in alcoholic fermentation

  • purify the atmosphere

  • are used in curdling of milk.


The plant body of moss (Funaria) is

  • completely sporophyte

  • predominantly sporophyte with gametophyte

  • completely gametophyte

  • predominantly gametophyte with sporophyte


Passage cells are found in

  • dicot stem

  • monocot root

  • monocot stem

  • all of these


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

  • basement membrane

  • epidermis

  • dermis

  • either (b) or (c).


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

  • Soredia

  • lsidia

  • Cyphella

  • Cephalodia


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

  • precystic stage

  • mature quadrinucleate stage

  • trophozoite stage

  • mature binucleate stage


Which of the following Phyla are included in Enterozoa?

  • Annelida, Mollusca, Porifera

  • Echinodermata, Hemichordata, Porifera

  • Mollusca, Arthropoda, Hemichordata

  • Porifera, Mollusca, Arthropoda


Hydra receives impulses and stimuli through

  • nerve net

  • nematocytes

  • sensory cells

  • flame cells


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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