Explore topic-wise InterviewSolutions in Current Affairs.

Neo Darwinism is the modified version of Darwin’s theory in the light of new information from the branches of genetics, cytology, geology, and paleontology about the reasons of variations occurred in organisms. 

Hugo deVries first supported Darwin by his theory of mutation.

Mutation

Sudden changes that occur in genes are called mutation.

Mutation Theory: Mutation theory explains that new species are formed by the inheritances of sudden changes that occur in genes. This theory formulated by a Dutch scientist Hugo de Vries.

Darwin could not explain the reasons for continuous variations in organisms.

However, Hugo deVries explained that one of the reasons for variations in organisms is mutation (sudden changes that occur in genes).

c. The structure of organisms formed by continuous use is transmitted to next generations.

Eukaryotes are originated from primitive prokaryotic cell. Gradually colonies of membrane-bound eukaryotic cells are formed. This led to the emergence of multicellular organisms.

a. Jean Baptist Lamarck. 

b. The acquired characters were not inheritable.

The changes in the body (Acquired characters) that occur in the lifetime of an organism do not affect its genetic constitution and hence not possible to transmit to the next generation.

Theory of Inheritance of Acquired Characters. Continuous use or disuse of an organ results variations to develop changes in the structure of that organ (Acquired characters). These will be transmitted to the next generation to form new species.

Of all the taxa, only the species actually exists in nature as a biologically cohesive unit that is bonded by interbreeding and separated from other species via reproductive isolation
Only the species is a real entity
Combining species into higher taxonomic categories is somewhat subjective involving judgment by the taxonomists

The correct answer is option (A)

RNA is more labile and prone to degradation(owing to the presence of 2’ OH groupin its ribose). Hence heat-killed S-strain maynot have retained its ability to transform the Rstrain into virulent form if RNA was its geneticmaterial.

A. Option 9 Sacral spinal segments. This region is like a minor accessory brain in coordinating micturition and defaecation and contributing to sexual reflexes. 

B. Option 2 Hypothalamus. This is the region where responses to both hot and cold environments are coordinated. A hot environment favours vasodilation and sweating; a cold environment favours vasoconstriction and increased skeletal muscle tone. 

C. Option 5 Brainstem. This is the region where the arterial baroreceptor reflexes are coordinated. 

D. Option 5 Brainstem. This is also the site for the swallowing and vomiting reflexes. 

E. Option 1 Spinal cord. The tendon reflexes in the limbs, such as the biceps and quadriceps jerks in response to striking their tendons, are spinal reflexes; they are not confined to any one region of the cord.

The plasma membrane is the outer the membrane of the cell, it delimits the cell itself and a cell interior with specific conditions for the cellular function. Since it is selectively permeable, the plasma membrane has an important role in the passage of substances inwards or outwards.

Two keto groups

1. Fragmentation: 

It is the break down detritus into smaller particles, by detritivores (earthworm). 

2. Leaching: 

It is the process in which water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. 

3. Catabolism: 

It is the process in which leads to bacterial and fungar enzymes degrade detritus into simpler inorganic substances. 

4. Humification: 

It is the process which leads to the accumulation of a dark coloured amorphous substance called humuns that is highly resistant to microbial action and undergoes very slow decomposition. 

5. Mineralisation : 

It is the degradation of humus by some microbes and the release of inorganic nutrients.

Direct current:

(i) Its magnitude is constant and flows in one direction only.

(ii) The frequency of DC is zero

Alternating current:

(i) Its magnitude and direction reserves periodically.

(ii) The frequency of AC is finite.

An electric generation is based on the principle of electromagnetic induction when a rectangular coil is rotated in a uniform magnetic field, an induced voltage is generated between the ends of the coil.

Germplasm collection : It is the centre collection of plants or seeds having diverse alleles for all the genes in a given crop.

If we kill all the organisms in one trophic level the following effects will taken place

(i) The population of organisms in previous tropic level will increase.

(ii) The organisms in next trophic level will not be able to get the food so they will migrate to some other ecosystem or die.

(iii) It will cause an ecological imbalance in the food chain.

Trophic levels are the feeding level in an ecosystem, the trophic level of living beings represent their placement in a food chain it also tell the order of consumption and energy transfer throughout the ecosystem.

Vitamin B – 12 Cyanocobalamine. 

Pleura are the two membranes that protect lungs from external shocks.

(i) RBC are present in blood, RBC are absent in lymph. 

(ii) Blood is Red in colour, lymph is colourless.

Correct option is C) We are leaving on Saturday

Acacia, Neem, Drumstick, Eucalyptus and Sapota are the gum yielding plants present in our surroundings.

Bihar is most affected from food problem.

Correct option is A) My father is ill

Correct option is B) I am hungry

A. spacing between atomic layers

A. 1.6 × 10^-19 J

The Correct option is B. 10^-13 J

The Correct option is D. 10^-10 m

B. diameter of atomic nuclei

A. fully occupied

The Correct option is C. gamma

(a) Earth’s magnetic field changes with time. It takes a few hundred years to change by an appreciable amount. The variation in earth’s magnetic field with the time cannot be
neglected.
(b)Earth’s core contains molten iron. This form of iron is not ferromagnetic. Hence, this is not considered as a source of earth’s magnetism.
(c)The radioactivity in earth’s interior is the source of energy that sustains the currents
in the outer conducting regions of earth’s core. These charged currents are considered to
be responsible for earth’s magnetism.
(d)Earth reversed the direction of its field several times during its history of 4 to 5 billion years. These magnetic fields got weakly recorded in rocks during their solidification. One can get clues about the geomagnetic history from the analysis of this rock magnetism.
(e)Earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km) because of the presence of the ionosphere. In this region, earth’s field gets modified because of the field of single ions. While in motion, these ions produce
the magnetic field associated with them.
(f)An extremely weak magnetic field can bend charged particles moving in a circle. This
may not be noticeable for a large radius path. With reference to the gigantic interstellar
space, the deflection can affect the passage of charged particles.

(D) 115 V, 100 W.

(A) mho /metre

(A) 1 /16 times 

Correct option  (1)  A

Explanation:

In series combination, equivalent resistance increases, if parallel combination, equivalent resistance decreases. Lesser slope represents parallel combination 

The pendulum's period depends on the length of the rod, and  it changes between summer and winter, as the rod expands and contracts with changes in temperature. 
Rods get longer in warmer weather, shorter in colder weather. With a shorter rod, a pendulum will swing faster and a clock will run faster. With a longer rod, the pendulum will swing slower and the clock will slow down.

Correct answer is (b) dioptre