Explore topic-wise InterviewSolutions in Current Affairs.

The correct answer is: B

Patch test is recommended before Bleaching.

The correct answer is: C

Correct option: 3.Threading

Correct option: 2. Cuticle

The correct answer is: C

Correct option: 3. Electrolysis

Correct option: 1. Cleansing

Plants do not only lose water as vapor, as by transpiration. The leaves also lose liquid water by a phenomenon known as gutation. Gutation takes place through structures called hydathodes similar to stomata. Gutation mainly occurs when transpiration is difficult due to high air humidity or when the plant is placed in a watery soil.

In some plants that have leaves that receive too much sunlight the stomata concentrate in the inferior epidermis, so their heating is lower and less water is lost by stomatal transpiration. In other plants of dry environments the stomata group in some regions of the leaf; over the surface of these areas the water concentration of the air is higher comparing to the environment and the loss of water by transpiration is thus reduced. Some plants of dry climates also have stomata within cavities.

Stomata (singular, stoma) are small specialized passages for water and gases present in the epidermis of the plants. As the plant needs more or less to lose water and heat the stomata respectively close or open preventing or allowing the passage of gases by diffusion.

Correct answer is (c) Play 

Correct answer is (b) Free Play 

Correct option: (B) Social

Speaking is not a part of non-verbal communication.

Correct answer is (c) Jumping and Landing on one leg 

Correct option: (D) All of the above

Correct answer is (b) Parent-Teacher Meeting 

(A) Food web

Correct option: a) Bargaining

Correct option: (B) 30 degree

Correct option: (A) Click ‘Insert’ on the toolbar

Correct answer is (d) Weather condition

Correct answer is (a) Assessment 

Correct answer is (b) Balance 

Correct answer is b. Dock Panels 

Correct option: (B) Hybrid business

Correct option: (C) Taekwondo

The root cap is a protective structure located in the tip of the growing root. It protects the meristematic tissue of the root forming a cap that surrounds the tip. The cover is necessary since during the growth of the root the meristem otherwise would be injured by the friction with the soil.

The default view where one can write and design presentation is also called Normal view.

The roots have a central portion called medulla made of vascular tissue (inner xylem and outer phloem). The medulla is surrounded by the medullary parenchyma and delimited by pericycle, a meristem that originates the secondary roots (ramifications). Externally to the medulla lies the cortical portion formed of endodermis (that surrounds the pericycle) and cortical parenchyma. The covering of the roots is epidermis (with root hairs) later substituted by suberized (corky) periderm.

The main natural plant hormones and their respective functions are the following: 

Auxins (the best known natural auxin is IAA, indoleacetic acid): their function is to promote plant growth, distension and cellular differentiation. Gibberellins: have action similar to auxins (growth and distension), stimulate flowering and fruit formation and activate seed germination. Cytokinins: increase cellular division rate and together with auxins help growth and tissue differentiation, slow the plant aging. Ethylene (ethene): a gas released by plants that participates in the growth process and has noteworthy role in fruit ripening and in leaf abscission.

The stoma is made of a central opening, the ostiole, or slit, delimited by two guard cells responsible for its closing or opening. A substomatal chamber is located under the ostiole.

Secondary roots are ramifications of the primary (main) root. The secondary roots emerge from the pericycle, inner tissue of the root. The shoots originate from the lateral buds of the stem. Therefore the origin of the secondary roots is endogenous and the origin of the shoots is exogenous.

Transpiration is the loss of water from the plant to the atmosphere in the form of vapor.

Transpiration occurs through the cuticle of the epidermis (cuticular transpiration) or through the ostioles of the stomata (stomatal transpiration). The most important is stomatal transpiration since it is more intense and physiologically regulated.

The extension of a Power Point is PPt.

The opening and the closing of the stomata depend upon the necessity of the plant to lose water and heat through transpiration (exit of water vapor means elimination of heat). When the plant has excessive water the guard cells become turgid and the ostiole opens. When little water is available the guard cells become flaccid and the ostiole closes.

Water enters and goes out the stomata by osmosis.

Other factors like light intensity and carbon dioxide concentration in the leaves influence the opening and the closing of the stomata. When luminosity is high the photosynthesis rate increases and the stomata open to absorb more carbon dioxide from the environment and release heat; when luminosity is low the stomata tend to close. When the carbon dioxide concentration in the photosynthetic parenchyma is low the stomata open to absorb more of the gas and make photosynthesis possible; when such concentration is high the stomata tend to close. 

Swamp and marsh plants generally present supporting roots that ramify from portions of the stem above the ground helping the plant to fixate down the muddy and sandy soil. They may also have respiratory roots (pneumatophores), structures that emerge from buried roots to catch oxygen.

Action potential is the maximum positive voltage level achieved by the neuron in the process of neuronal activation, around + 35 mV. The action potential triggers the depolarization of the neighboring regions of the plasma membrane and thus the propagation of the impulse along the neuron.

Resting potential is the membrane voltage when the cell is not excited, about –70 mV.

Excitation threshold is the voltage level, about –50 mV, that the initial depolarization must reach for the action potential to be attained. 

In the covering of the leaves and of the primary structure of the stem gas exchange is made through the cuticle and pores of the epidermis. In the covering of the secondary structure of the stem of woody plants gas exchange is made through the lenticels of the periderm (small breaches of the cork). The gas exchange in plants is accomplished by simple diffusion.

Repolarization is the return of the membrane potential from the action potential (+35 mV) to the resting potential (-70 mV).

When the membrane reaches its action potential voltage-gated sodium channels close and voltage-gated potassium channels open. So sodium stops entering into the cell and potassium starts to exit. Therefore the repolarization is due to exiting of potassium cations from the cell.

The repolarization causes the potential difference temporarily to increase under –70 mV, below the resting potential, a phenomenon known as hyperpolarization.

The primary cause of the neuronal depolarization is the binding of neurotransmitters released in the synapse (by the axon of the neuron that sent the signal) to specific receptors in the membrane of the neuron that is receiving the stimulus. The binding of neurotransmitters to those receptors is a reversible phenomenon that alters the membrane permeability of the region since the binding causes sodium channels to open. When positive sodium ions enter the cell in favor of their concentration gradient, the membrane voltage increases, thus lessening the negative polarization. If this depolarization reaches the excitation threshold (about –50 mV) the depolarization continues, the action potential is reached and the impulse is transmitted along the cell membrane.

Plants need to do gas exchange because they create aerobic cellular respiration (like animals) and they need to get molecular oxygen and to release carbon dioxide. Besides aerobic cellular respiration plants still need to get carbon dioxide to make photosynthesis and to release the molecular oxygen that is the product of this reaction.

Imagine your any experience through which you have tried to motivate your parents through gestures. it relates to Non-Verbal Communication.

In bryophytes the substance transport is done by diffusion. In tracheophytes (pteridophytes, gymnosperms and angiosperms) there are specialized conductive vessels, the xylem that carries water and mineral salts and the phloem that conducts organic material (sugar).

When the neuron receives a stimulus by the binding of neurotransmitters to specific receptors sodium channels open and the permeability of the plasma membrane in the postsynaptic region is altered. Sodium ions then go into the cell causing lowering (less negative) of the membrane potential. If this reduction of the membra

ne potential reaches a level called the excitation threshold, or threshold potential, about –50 mV, the action potential is generated, i.e., the depolarization intensifies until reaching its maximum level and the depolarization current is transmitted along the remaining length of the neuronal membrane.

If the excitation threshold is reached voltage-dependent sodium channels in the membrane open allowing more sodium ions to enter the cell in favor of the concentration gradient and an approximate –35 mV level of positive polarization of the membrane is achieved. The voltage-dependent sodium channels then close and more voltage-dependent potassium channels open. Potassium ions then exit the cell in favor of the concentration gradient and the potential difference of the membrane decreases, a process called repolarization.

The action potential triggers the same electrical phenomenon in neighboring regions of the plasma membrane and the impulse is thus transmitted from the dendrites to the terminal region of the axon.

As in most cells the region just outside the surface of the neuron plasma membrane presents a positive electrical charge in relation to the region just inside that thus is negative.

The normal (at rest) potential difference across the neuron membrane is about – 70 mV (millivolts). This voltage is called the resting potential of the neuron.

Antisocial personality is characterized by a pattern of disregard for and violation of the rights of others.

Carbon dioxide and oxygen are not transported through the xylem or phloem. These gases reach the cells and exit the plant by diffusion through intercellular spaces or between neighboring cells.

The plasma membrane of the neuron when at rest maintains an electric potential difference between its external and internal surfaces. This voltage is called resting potential. The resting potential about –70 mV indicates that the interior is more negative than the exterior (negative polarization). This condition is maintained by transport of sodium and potassium ions across the plasma membrane.

The membrane is permeable to potassium ions but not to sodium ions. At rest the positive potassium ions exit the cell in favor of the concentration gradient since within the cell the potassium concentration is higher than in the extracellular space. The positive sodium ions cannot however go into the cell. As positive potassium ions exit the cell with not enough compensation of positive ions entering the cell, the intracellular space becomes more negative and the cell stays polarized.