OAVS TGT Science Mock Test - 5 - OTET MCQ

Leghorn is probably the best egg-laying breed to introduce to tropical Countries, if conditions are not too harsh. Eggs are produced at a lower price and the large comb and wattles, naked legs and white feathers are all factors favouring thermo-tolerance. Where a hot climate and insufficient feeding are limiting factors, Leghorn-derived breeds are more suitable and may also be utilised to improve  the genetic pool of local strains.

NaCl (sodium chloride) is formed by the combination of a Na+ (sodium cation) and a Cl- (chloride anion). The sodium atom loses one electron to form a positively charged ion (cation), while the chlorine atom gains that electron to form a negatively charged ion (anion).

Thus, the correct answer is A) Na cation and Cl anion.

Oxygenated blood carries O₂ to the various tissues, muscles, cells, et(c) from the lungs and heart, while deoxygenated blood carries CO₂ from the organs to the lungs which is removed from the body. In birds and mammals, it is essential to keep the oxygenated blood separated from the deoxygenated blood In this way, only highly oxygenated blood is sent out to the body's tissues for far more efficient diffusion into the cells of the body, giving them more 'fuel' to run cellular respiration in the mitochondria, to make ATP molecules to run the reactions that allow them to maintain body temperature in addition to running all of their metabolic reactions of the body. If they were not separated, it would probably take much longer to perform simple activities and metabolism would be reduced as a consequence.

A salt associated with the water of crystallization is known as a hydrate.

Explanation:
When an allele fails to express itself in the presence of another allele in the F1 generation, it is considered to be recessive. This means that the recessive allele is masked or overshadowed by the dominant allele, resulting in only the dominant allele being expressed phenotypically.
Here is a detailed explanation:
Recessive:
- When an allele fails to express itself in the presence of another allele in the F1 generation, it is called a recessive allele.
- The recessive allele is represented by a lowercase letter.
- In order for the recessive allele to be expressed phenotypically, an individual must have two copies of the recessive allele (homozygous recessive).
Codominant:
- Codominance occurs when both alleles of a gene pair in a heterozygous individual are fully expressed.
- Neither allele is dominant or recessive, and both are expressed simultaneously.
- This results in a phenotype that shows a combination of both alleles.
Complementary:
- Complementary genes refer to the interaction between two different genes that work together to produce a specific phenotype.
- They are not related to the expression of a single allele in the presence of another allele.
Epistatic:
- Epistasis refers to the interaction between genes where one gene masks or modifies the expression of another gene.
- It is different from the scenario described in the question, where a single allele fails to express itself in the presence of another allele.
Therefore, the correct answer is A: Recessive.

Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions

Correct option is B)

• The plant cell can do respiration and photosynthesis.
• The plants get energy through the process of respiration in which glucose food breaks down in the presence of oxygen to form carbon dioxide and water with the release of energy.
• In plants, photosynthesis takes place in the cell organelle called chloroplast. A plant cell cannot breathe because in a plant body lungs are absent.

So the correct answer is 'Respiration and photosynthesis'.

Formula to change the value of celsius into kelvin is K = C + 273. As we know that boiling point of water is 100 c. SO, K = 100 + 273 K = 373 k.

option ( b) is the correct✔ answer. 

 

Explanation:- first we have to calculate, the no. of molecules  and then we will compare them. To calculate the number of molecules, we multiply no. of moles with the Avagadro's number. 

• 0.5 *( 6.022 * 10^23) 

=  3.11 * 10^ 23

• 2* ( 6.022 * 10^23) 

=  12.044 * 10^ 23

• 3.35 * 10^19

• 0.05 * ( 6.022 * 10^23) 

= 0.3011 * 10^ 23

So, we can see, 4<1<3<2   is the correct✔ answer.

Regeneration is one of the processes in which if an organism is cut into several pieces, each of its parts regrows to the original state. This process is carried out by specialized cells called stem cells. 

Fe is more reactive than Cu, hence Fe can displace the Cu from its salt solution.

Human variability refers to the fact that there is a range of possible values for each of the numerous physical and mental characteristics of human beings. Fundamental Characteristic. Variation is, in fact, inherent in every living species.

e correct answer is c

   The process by which we can separate the particles of a colloidal solution is called Centrifugation.

Ciliated columnar epithelium moves mucus and other substances via cilia and is found in the upper respiratory tract, the fallopian tubes, the uterus, and the central part of the spinal cord.

The coloured material from flower petals can be separated by chromatography process. Chromatography is used to separate materials present in solution in vary trace amount

Gustatory receptors detect taste while olfactory receptors detect smell.

Multicellular glands are formed by the folding of epithelial tissue. Epithelial tissue forms the lining of glands and ducts.

Physical Changes:
A physical change is a change in the state or form of matter without any change in the chemical composition or identity of the substance. In other words, the substance remains the same before and after the change.
Examples of Physical Changes:
A. Burning of a candle:
- This is a chemical change, not a physical change. The candle wax undergoes combustion, which involves a chemical reaction with oxygen to produce heat, light, and various gases.
B. Rusting of iron:
- This is a chemical change, not a physical change. Rusting occurs when iron reacts with oxygen in the presence of moisture, forming iron (III) oxide (rust).
C. Freezing of water:
- This is a physical change. When water is cooled below its freezing point, it undergoes a phase change from a liquid to a solid, forming ice. The chemical composition of water (H2O) remains the same.
D. Digestion of food:
- This is a chemical change, not a physical change. Digestion involves the breakdown of complex food molecules into simpler substances through various chemical reactions in the digestive system.
Conclusion:
The freezing of water is the only example mentioned that represents a physical change. The other options involve chemical changes.

Geotropism, also known as gravitropism, is the plant's growth response either towards or away from the gravitational force. This movement helps plants orient themselves properly with respect to the Earth's gravitational field. For instance, roots typically exhibit positive geotropism by growing towards gravity, anchoring the plant and aiding in water and nutrient absorption, while shoots often display negative geotropism by growing away from gravity, towards the light for photosynthesis.

Light waves are electromagnetic waves:

• Light waves are a type of electromagnetic waves.


• Electromagnetic waves are waves that consist of both electric and magnetic fields oscillating perpendicular to each other and to the direction of wave propagation.


• Light waves are a form of electromagnetic radiation that can be detected by the human eye.


• They have a wide range of wavelengths, which determine the color of light.


• Light waves can travel through a vacuum as well as through various mediums, such as air, water, and glass.


• They can be reflected, refracted, diffracted, and polarized.


• Light waves also exhibit properties of both particles and waves, known as the wave-particle duality.

Therefore, the correct answer is A: Electromagnetic waves.

Vacoules store excess food of cell, when it is emergency they release them and in plant cells the vacoules are larger in size(compared to animal cells) because plants can not move

Metal are generally hard and produce tinkling sound when bent. Non-metals are brittle and compounds cannot be bent.

The correct option is C.
Acetic acid that is Carboxylic acids gives effervescence with NaHCO₃ solution.

One parent is homozygous for one allele, and the other parent is homozygous for the other allele. The offspring make up the first filial (F1) generation. Every member of the F1 generation is heterozygous and the phenotype of the F1 generation expresses the dominant trait.

Sulfur dioxide gas turns moist litmus paper from blue to red and moist universal indicator paper to red - it is acidic.

Fluidity is the ability of matter of not having a definite shape. Liquids such as water occupy the shape of the container in which they are kept that means they don't have a fix shape so they are called fluids. Gases are also considered fluids. 

Dalton’s Atomic Theory was given by John Dalton.
According to this theory: -
(a) Matter is made up of invisible particles known as atoms.
(b) The properties of all the atoms of a given element are the same including mass.
(c) Atoms of different elements combine in fixed ratios to form compounds.
(d) Atoms are neither created nor destroyed.
(e) The formation of new products results from the rearrangements of existing atoms.
(f) Atoms of an element are identical in mass, size and properties.

Contrasting Traits Studied by Mendel:
Mendel's experiments with pea plants involved the study of several contrasting traits. He meticulously observed and recorded the characteristics of the plants and their offspring. The traits studied by Mendel can be summarized as follows:
1. Seed Color:
- Contrasting traits: Yellow seeds vs. Green seeds.
2. Seed Shape:
- Contrasting traits: Round seeds vs. Wrinkled seeds.
3. Flower Color:
- Contrasting traits: Purple flowers vs. White flowers.
4. Flower Position:
- Contrasting traits: Axial flowers (along the stem) vs. Terminal flowers (at the tip of the stem).
5. Pod Color:
- Contrasting traits: Green pods vs. Yellow pods.
6. Pod Shape:
- Contrasting traits: Inflated pods vs. Constricted pods.
7. Stem Length:
- Contrasting traits: Tall stems vs. Dwarf stems.
Therefore, Mendel studied a total of seven contrasting traits in pea plants. These traits played a crucial role in his formulation of the laws of inheritance and laid the foundation for modern genetics.

The chemical formula of benzene is C6H6, so it has six carbon atoms and six hydrogen atoms.