11.

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 of the following have porous body and are diploblastic?

• Aurelia and Obelia

• Adamsia and Euplectella

• Leucosolenia and Spongilla

• Sycon and Hydra

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

Animals take phosphorus from

• water

• plants

• rock

• soil

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

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

Microvilli of intestinal epithelium are similar in function with 

• typhlosole in earthworm

• hepatic caecae in cockroach

• intestinal caecum in earthworm

• Malpighian tubules in coackroach

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

Cyclic photophosphorylation involves

• PS I

• PS II

• PS I and PS II

• P₆₈₀

The taxon which includes related species is

• class

• order

• family

• genus