Human urine is usually acidic because

• The sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries.

• Excreted plasma proteins are acidic

• potassium and sodium exchange generates acidity

• potassium and sodium exchange generates acidity

In photosynthesis, the light-independent reactions take place

• Thylakoid lumen

• Photosystem I

• Photosystem II

• Photosystem II

In mammalian eye, the 'fovea' is the center of the visual field, where

• high density of cones occur, but has no rods.

• the optic nerve leaves the eye.

• only rods are present

• only rods are present

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth

• Canine

• Premolars

• Molars

• Molars

A column of water within xylem vessels of tall trees does not break under its weight because of

• Dissolved sugars in water

• Tensile strength of water

• Lignification of xylem vessels

• Lignification of xylem vessels

The enzyme that is not present in succus entericus is

• maltase

• nucleases

• nucleosidase

• nucleosidase

Pick up the wrong statement

• Cell wall is absent in Animalia

• Protis ta have photosyn thetic and heterotrophic modes of nutrition

• Some fungi are edible

• Some fungi are edible

Among china rose, mustard, brinjal, potato, guava, cucumber, onion and tulip, how many plates have superior ovary?

• Five

• Six

• Three

• Three

Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.

• Pleurisy

• Emphysema

• Pneumonia

• Pneumonia

In which group of organisms the cell walls form two thin overlapping shells which fit together?

• Chrysophytes

• Euglenoids

• Dinoflagellates

• Dinoflagellates