The advantage of having both eyes on the front are- a) visual information comes at the same time from both the eyes, the field of vision is not different. b) Both eyes at the front help primates in calculating distances, depth perception which helped in climbing or jumping through depths. c) The brain puts the visual information together in the form of a 3D-image due to the binocular vision. 
The exception of this is the field of vision of 2 eyes is different.

The introns (non-coding regions) contain repeated sequences of base pairs known as VNTR’s/ Variable number Of Tandem Repeats. These repeated sequences contain upto 100 base pairs. VNTR’s are of 2 types, microsatellite sequences and minisatelite sequence. The microsatellite sequences are 1-6bp repeat regions. Minisatelites sequences are 11-60bp repeat units.

Short Tandem Repeats or STR’s are stretches of DNA containing repeating tandem units of 2-7 nucleotide in length.

The hind gut is also known as proctodaeum. It includes the anal canal and anus.

• Full expansion of the lungs does not take place after the first inspiration and is achieved only after a short time of birth.
• Crying helps the expansion of the chest and lungs.
• After the first inspiration, the lungs don’t completely empty the air drawn inside, and lungs remain slightly expanded.

Light: maximum rate of photosynthesis in red light, followed by blue light and poor in green light.

Red light promotes carbohydrate synthesis blue light promotes protein synthesis. Light saturation point is 800 ft candles. Maximum photosynthesis occurs at saturation point. That is at 10% of full sunlight.

V = 25 V and I = 10 A 
P = V × I = 25 × 10 = 250 W 
Since, the efficiency of motor is 40% 
Power dissipated as heat in the motor windings = (100% − 40%) = 60% 
Total power dissipated as heat in the windings 

If R is the resistance of the winding of the motor, total power dissipated as heat = I²R 

We know that, 

From circuit diagram, 

(R and 2 Ω in parallel and this combination in series with two 1 Ω resistors) 
Now, from (1) 

∴ R = 2 Ω

We know that if the current is constant, electric power is directly proportional to electric resistance. Thus, 60 W lamp offers more resistance than 20 W lamp.

Consider a laptop, to which a power of 60 W is to be delivered via charging cable having resistance of 0.25 Ω to be dissipated by it finally. 
If 20 V is the voltage across laptop and I is the current through it, 
P = VI 
∴ I = P/V = 60/20 = 3 A 
Hence, Power dissipated in the charging cable will be 
P’ = I²R = (3)² × 0.25 = 2.25 W

Here charge on electron, e = 1.6 × 10⁻¹⁹ 
Power of one motor = 24 W 
Operating voltage of one motor = 12 V 
We know that, 
P = VI 
I = P/V = 2 A 
Now, charge passing through one motor in one second: 
q = I × t = 2 × 1 = 2 C (t = 1s) 
Therefore, number of electrons moving through one motor 
N = q/e = 2 / 1.6 × 10⁻¹⁹ = 1.25 × 10¹⁹ 
Now number of electrons passing through 4 motors will be = 4 × 1.25 × 10¹⁹ = 5 × 10¹⁹

Chloroform on reaction with nitric acid give chloropicrin (nitro chloroform) the following reaction: 

Reaction of HBr with propene in the presence of peroxide gives n-propyl bromide. This addition reaction is an example of Anti-Markownikoff addition reaction. 

Mechanism of this reaction is represented as follows: 
Step 1: Formation of free radical of peroxide by means of decomposition. 

Step 2: Benzoate free radical forms bromine free radical with HBr. 

Step 3: Bromine free radical attacks on C= c of propene to form intermediate free radical.

Hence,is the major product of this step. 

Step 4: More stable free radical accept hydrogen free radical from benzoic acid and give final product of reaction. 

Step 5: Benzoate free radicals are changed into benzoyl peroxide for the termination of free radical chain. 

2-hydroxy propane or secondary alcohol is oxidized into propanone (corresponding carbonyl compound because in 2-hydroxy propane, secondary alcoholic group is present and it is oxidized into ketone). 

A sequence of three nucleotides in messenger RNA makes a codon for an amino acid because four bases in messenger RNA adenine, cytosine, guanine and uracil have been shown to act in the form of triplet.

Aniline on diazotization in cold (at 0⁰ to 5⁰ C) gives benzene chloride.

This benzene diazonium chloride on coupling reaction with dimethyl aniline gives a coloured product i.e., p-(N, N-diethyl) amino azobenzene (azodye).