Tag: zoology

• Moist vapour theory was proposed by a Greek philosopher Pythagoras.
• According to this theory a certain moist vapour is transmitted from the male towards the female during the fertilization and it develops into an embryo.
• From where the later new organism is developed.
• Hence the correct option is B.

• Proteins and nucleic acids are the two most basic compounds for the sustenance of life. 
• Proteins provided a limiting membrane and boundary to primitive entities and nucleic acids were important information molecules, which were required to build self-replicating entities. Option B is correct

Classification helps orderly and hierarchical grouping of organisms into different taxa based on their similarities and differences and therefore helps in identification of species 

• During heavy exercise, the demand for energy is high but the supply of oxygen to produce energy is limited. Therefore, anaerobic respiration takes places in the muscles cells to fulfil the demand for energy. This anaerobic breakdown of glucose leads to the formation of lactic acid in muscles. The accumulation of lactic acid in muscles leads to muscle cramps.
• HenceDuring heavy exercise, we get cramps in the legs due to the accumulation of Lactic acid.
• So, the correct answer is 'Lactic acid'.

• Glucose is the major source of energy in the body. excess glucose is stored in the form of glycogen in muscles and liver.
  
• Most of the glycogen is stored in liver i.e 10 % of the mass of liver and the muscles contain a low amount of glycogen i.e 1% of the muscle mass.
  
• When the glucose is completely utilized the animal feels exhausted, to overcome this the glycogen is degraded to lactic acid by enzymes in muscles and liver. 
• So, the correct answer is 'Exhausted'.

• The Burning of glucose during respiration requires oxygen. When a Muscle is subjected to continuous exercise there will be low availability of oxygen. This leads to the anaerobic breakdown of glucose which results in the formation of lactic acid. 
• This accumulation of lactic acid in the muscle causes muscle fatigue.
• Hence Muscles get fatigued due to the accumulation of lactic acid.
• So, the correct answer is 'Lactic acid'.

• Regor mortis is one of the recognizable signs of death, caused by the depletion of ATP followed by the chemical changes in muscles after death, causing the body to stiffen and locked in place, making it difficult to move and manipulate.
  
• When the ATP is depleted muscles can not contract and the body becomes stiff.
• It takes about 2 days for rigor mortis to fade, and once it does, decay sets in.
  
• Hence rigor mortis is due to depletion of ATP.
  
• So, the correct answer is 'Depletion of ATP'.
  

• The all-or-none law is the principle that the strength by which a nerve or muscle fibre responds to a stimulus is independent of the strength of the stimulus. If that stimulus exceeds the threshold potential, the nerve or muscle fibre will give a complete response; otherwise, there is no response.
  
• Hence All or none law is not applicable for whole skeletal muscle.
  
• So, the correct answer is 'Whole skeletal muscle'.