NEET Part Test - 8 - NEET MCQ

The loop rotates anticlockwise due to magnetic torque and as a result north and south poles will attract each other.

Here, b and x² = L² have same dimensions
Also,

a x b = [M^-1L²T]

Current flowing through the conductor,
I = nev_d A. Hence

Given: T/2 = 0.5 s
T = Is
Frequency, f = 1/T = 1/1 = 1 Hz
If A is the amplitude, then
2A = 50cm ⇒ A = 25cm

Unit positive charge at O will be repelled equally by three charges at the three comers of triangle.

Force on M = Mg
Reaction force = Ma
force of friction = μR = μMa
Force of friction will balance the weight. So

For combustion reaction, ΔH is negative,
Δn = (16 + 18) — (25 + 2) = +7,
so ΔS is + ve, reaction is spontaneous, hence ΔG is -ve.

Reagents used in the various steps indicate that the compound Z has an alcoholic group. This set of reactions is possible only when Z is CH₃CHOHCH₃.
In options a and c, Y cannot be converted back into d by the given series of reactions.

Ozone hole is reduction in thickness of ozone layer in stratosphere.

According to the (n + 1) rule the higher the value of (n +1), the higher is the energy. When (n +1) value is the same see value of n.

Mn²⁺ (3d⁵) is more stable than Mn³⁺ (3d⁴).

In NH₄N0₃, there are two different N-atoms (NH⁺₄ , NO^-₃ ) with different oxidation numbers, thus reaction is not disproportionation.

Deposition ofbony matter by osteoblasts and resorption chondroblasts.

During double fertilization in plants one sperm fises with the egg cell and the other sperm fuses with two polar nucles of the central cell to produce triploid primary endospersm cell (3n). Since the latter involves fusion of three haploid nudeus therefore it is called triple fiixion.

A centriole is a barrel - shaped cell structure found in most animal eukaryotic cells, though absent in higher plants and most fungi.

According to the concept of species-area relationship, within a region, species richness gets increased when explored area is increased, but only up to a limit.

A keel is a structure of the papilionaceous type of flower, made up of two petals loosely united along their edges.

The logistic population growth is expressed by the equation where N is population density at time t, r is the Malthusian parameter (rate of maximum population growth) and K is the so called carrying capacity (i. e. maximum sustainable population). It is a type of population growth when resources are limiting.

Abscisic Acid (ABA) is called stress hormone which works in adverse environmental condition when there is low water content in atmosphere or in drought conditions. ABA causes the stomatal closure of leaves due to which the water loss by the plant is minimized.

The last two pairs i.e. 11th and 12th pairs ribs remain free anteriorly, hence, they are called as floating ribs.

The pineal gland secretes melatonin, a hormone that controls the daily cycles and acts as the “biological clock”

When the external intercostal muscles and diaphragm relax, the ribs move downward and inward and diaphragm becomes convex (dome shaped), thus decreasing the volume of thoracic cavity and increasing the pressure inside as compared to the atmospheric pressure outside. This will cause the air to move out (expiration).

Lyases enzyme catalyses breakdown without addition of water.
Isomerase enzyme catalyses the conversion of an aldose sugar to a ketose sugar.
Oxidoreductase enzyme catalyses the transfer of electrons from one molecule to another molecule.
Ligases enzyme catalyses the bonding of two RNA molecules.

In the given figure the exchange of respiratory gases occurs in alveolar cavity.
The thickness of the alveolar-capillary barrier varies from 0.2 to 2.5 pm. The wall of the capillary endothelial cell is fused to that of the alveolar cell with only a very thin basement membrane between these two cells. This produces a very narrow gap across which oxygen and carbon dioxide can rapidly diffuse.

The Southern blot is used to detect and identify certain DNA sequences in a sample of bodily fluid. It uses single-stranded DNA to search out their complementary strands. When a Southern blot is performed on DNA, the first step is digestion of DNA with restriction enzymes. Restriction enzymes cut DNA at known sequences, and produces DNA fragments of a certain length. Once the DNA is cut into pieces, scientists conduct electrophoresis to separate them by size.

Gene therapy-Effort to fix functional gene
Humulin - Diabetes
Probe - A single stranded DNA of RNA tagged with a radioactive molecule.

Statements (i) and (iii) are correct.
Medical Termination of Pregnancy (MTP) during first trimester is generally safe.
Intrauterine device like copper-T are effective contraceptives.

Halophile - Bacteria residing in salty areas
Thermoacidophiles - Bacteria residing in hot springs
Methanogens - Bacteria which survives in marshy area
Basophiles - Bacteria which survives in alkaline medium.

'I' represent temporal bone in the given figure. The temporal lobe is one of the four major lobes of the cerebral cortex in the brain and located beneath the lateral fissure on both cerebral hemispheres of the mammalian brain. The temporal lobes are involved in processing sensory input into derived meanings for the appropriate retention of visual memories, language comprehension, and emotion association.

Artery is a blood vessel which receives blood from heart, has elastic thick wall showing jerky movements due to pumping activity of heart. Vein is a blood vessel which carries blood towards the heart, has wider lumen with internal valves where blood flows smoothly and slowly. Note: Blood capillary is a very fine blood vessel which has a single layered wall. Pulmonary veins are the only veins which carry oxygenated blood. (PO₂ = 95 mmHg, PCO₂ = 40mmHg)