Animals take phosphorus from
water
plants
rock
soil
B.
plants
Phosphorus is a major constituent of biological membranes, nucleic acids and cellular energy transfer systems. Many animals require this element to make shells, bones and teeth. The natural reservoir of phosphorus is rock. It is present in the form of phosphate. When rocks are weathered, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants. Herbivores and other animals obtain this element from plants.
Which of the following have porous body and are diploblastic?
Aurelia and Obelia
Adamsia and Euplectella
Leucosolenia and Spongilla
Sycon and Hydra
Chemosensitive area of respiratory centre in medulla is affected by
less CO2 and H+ ions
less O2 and H+ ions
excess CO2 and H+ ions
excess O2 and H+ ions
The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and bronchi are known as
squamous epithelium
ciliated epithelium
columnar epithelium
cubical epithelium
Microvilli of intestinal epithelium are similar in function with
typhlosole in earthworm
hepatic caecae in cockroach
intestinal caecum in earthworm
Malpighian tubules in coackroach
What are Singer and Nicolson known for?
One-gene-one-enzyme hypothesis
Plasma membrane modifications
Fluid-mosaic model of plasma membrane
Structure of DNA
Which one is correct regarding electrocardiograph (ECG)?
P- wave represents the electrical excitation of the ventricle.
QRS complex represents repolarisation of the ventricles
T- wave represents repolarisation of the atria
By counting the number of QRS complexes one can determine the pulse rate
What is the effect of GnRH produced by hypothalamus?
Stimulates the synthesis and secretion of androgens
Stimulates secretion of milk in mammary glands
Stimulates foetal ejection reflex
Stimulates synthesis of carbohydrates from non- carbohydrates in liver
