21.

Which one of the following is essential for photolysis of  water

• Manganese

• Zinc

• Copper

• Copper

The type of muscles present in our

• heart are involuntary and unstriated smooth muscles

• intestine are striated and involuntary

• thigh are striated and voluntary

• thigh are striated and voluntary

The 24 hour (diurnal) rhythm of our body such as the sleep -wake cycle is regulated by the hormone

• Calcitonin

• prolactin

• adrenaline

• adrenaline

Guttation is the result of 

• diffusion

• transpiration

• osmosis 

• osmosis 

Three of the following pairs of the human skeletal parts are correctly matched with their respective inclusive skeletal category and one pair is not matched. Identify the non -matching pair. 

• Pairs of skeletal parts	Category
  Sternum and ribs	Axial skeleton

• Pairs of skeletal parts	Category
  Clavicle and glenoid cavity	Pelvic girdle

• Pairs of skeletal parts	Category
  Humerus and ulna	Appendicular skeleton

• Pairs of skeletal parts	Category
  Humerus and ulna	Appendicular skeleton

Which one of the following aspects is an exclusive characteristic of living things?

• Isolated metabolic reactions occur in vitro

• Increase in mass from inside only

• Perception of events happening in the environment and their memory.

• Perception of events happening in the environment and their memory.

Given below is the ECG of a normal human. Which one of its components is human, which one of its components is correctly interpreted below?

• complex QRS - One complete pulse

• Peak T - Initiation of total cardiac contraction

• peak P and peak R together - systolic and diastolic blood pressures

• peak P and peak R together - systolic and diastolic blood pressures

The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function

• D - outer membrane -gives - rise to inner membrane by splitting

• B - Inner membrane - forms infolding called cristae

• C - Cristae - possess single circular DNA molecule and ribosomes

• C - Cristae - possess single circular DNA molecule and ribosomes

Which one of the following diagrams represents the placentation in Dianthus? 

The figure shows four animals (A),(B) (C) and (D). Select the correct answer with respect to common characteristics of two animals.

• (A) and (D) respire mainly through the body wall

• (B) and (C) shows radial symmetry

• (A) and (B) have cnidoblasts for self -defence

• (A) and (B) have cnidoblasts for self -defence