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.

Plants primarily get rid of excess water through the process of transpiration, which involves the evaporation of water from plant surfaces, mainly leaves.

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.

The smallest alkane which can form a ring structure is a cyclopropane.

When a strong acid reacts with a strong base in a neutralization reaction, the result is a neutral salt and water. This reaction signifies the completion of the neutralization process where the acidic and basic properties neutralize each other, forming a salt and water.

Electronic configuration of

Na is 2, 8, 1

Ca is 2, 8, 8, 2

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'.

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.

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

Hug the trees movement:
The "Hug the trees movement" was a grass-root level effort that aimed to end the alienation of people from their forests. The movement sought to create awareness and promote the conservation of forests by emphasizing the importance of trees and their preservation. Here is a detailed explanation:
1. Grass-root level effort:
- The movement was initiated at the grassroots level, meaning it was driven by the local communities and individuals who were directly affected by deforestation and environmental degradation.
- It was a collective effort of people who recognized the need to protect and preserve forests for the well-being of both humans and the environment.
2. Ending alienation from forests:
- The movement aimed to address the growing disconnect between people and forests.
- It sought to reconnect individuals with nature and raise awareness about the significance of forests in terms of biodiversity, ecological balance, and the provision of ecosystem services.
3. Conservation and preservation:
- The movement encouraged the conservation and preservation of forests, highlighting the role of trees in improving the quality of soil and sources of water.
- Forests play a crucial role in maintaining soil fertility, preventing erosion, and acting as natural water catchment areas.
- By hugging the trees, people displayed their love and concern for these vital natural resources.
Therefore, the "Hug the trees movement" primarily aimed to end the alienation of people from their forests and promote the conservation and preservation of these valuable ecosystems.

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.

According to the question, we need to determine the maximum number of electrons that can be accommodated in the nth level.

To solve this problem, we can use the formula for the maximum number of electrons in a specific energy level. The formula is given by:
Maximum number of electrons = 2n^2
Where:
- n represents the energy level or the principal quantum number.
Let's break down the solution into steps:
Step 1: Substitute the value of n into the formula.
- We are given the value of n as the nth level.
Step 2: Calculate the maximum number of electrons.
- Square the value of n (n^2).
- Multiply the squared value by 2 (2n^2).
Step 3: Determine the final answer.
- The maximum number of electrons that can be accommodated in the nth level is equal to the result obtained from step 2.
Therefore, the correct answer is option B: 2n^2.

The lacunae are situated between the lamellae, and consist of a number of oblong spaces. In an ordinary microscopic section, viewed by transmitted light, they appear as fusiform opaque spots. Each lacuna is occupied during life by a branched cell, termed an osteocyte, bone-cell or bone-corpuscle. Lacunae are connected to one another by small canals called canaliculi. A lacuna never contains more than one osteocyte. Sinuses are an example of lacuna.

Boiling point of water 100^oC +273 = 373k 

Melting point of water 0^oC = 273 K

Boiling point of Acetone = At atmospheric pressure acetone has a boiling point of 56°C

Melting poitn of aluminium = 660.3 °C

Lysosomes present in the cytoplasm of cell contain very strong enzymes that can breakdown the all organic wastes produced in the cell. So, lysosome is called as garbage disposal system of the cell.

The electronic structure of the noble gases is the basis for explaining why they are so unreactive.

Continuous use of fertilisers can destroy soil fertility because:
1. Organic matter is not replenished:
- Fertilisers primarily provide essential nutrients to plants, but they do not replenish organic matter in the soil.
- Organic matter, such as decomposed plant and animal materials, is crucial for maintaining soil fertility.
- It improves soil structure, water-holding capacity, nutrient retention, and provides a habitat for beneficial soil organisms.
2. Microbes in the soil are harmed:
- Continuous use of fertilisers can negatively impact the microbial population in the soil.
- Soil microbes play a vital role in nutrient cycling, decomposition of organic matter, and maintaining soil health.
- Fertilisers can alter the microbial community composition and reduce the diversity and activity of beneficial soil microbes.
3. Soil becomes hard:
- Excessive use of fertilisers can lead to the accumulation of salts in the soil, causing soil salinization.
- Salinization can result in the hardening of the soil, making it difficult for plant roots to penetrate and access water and nutrients.
- This can impede plant growth and decrease soil fertility over time.
Conclusion:
Continuous use of fertilisers without replenishing organic matter can lead to a decline in soil fertility. The absence of organic matter and the harm caused to soil microbes can disrupt nutrient cycling and reduce the overall health of the soil. Additionally, excessive fertiliser use can contribute to soil salinization, resulting in soil hardening and reduced plant growth. It is therefore important to adopt sustainable soil management practices that incorporate organic matter additions and minimize excessive reliance on fertilisers to maintain long-term soil fertility.

C + O₂  → CO₂ + Heat

• This is a Combination reaction because C and O₂ are combining to produce one single compound CO₂.
• This is also an Oxidation reaction because carbon is getting oxidized.
• This is also an exothermic reaction because in this reaction heat is getting released.

So Option D is correct

It contains a total of three carbon atoms with an aldehyde group. Propane + al = propanal.

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.

The third trophic level usually comprises small carnivores or secondary consumers in a food chain. These organisms primarily feed on herbivores or primary consumers, transferring energy from lower trophic levels to higher trophic levels. This step is essential for balancing energy flow within the ecosystem.

Sclerenchyma is a type of permanent tissue. They are dead, elongated, thin, narrow cells with thickened walls without any internal space. Therefore, option C is correct.

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.

The cerebrum, the large, outer part of the brain, controls reading, thinking, learning, speech , emotions and planned muscle movements like walking.

Ethane with molecular formula C₂H₆ has seven covalent bonds. 6 bonds between C-H and one is between C-C.

Explanation:

• A. It causes cooling: This is correct. Evaporation is a cooling process because it requires heat to change liquid into vapor, which removes heat from the surrounding area.

• B. It increases with increase in humidity: This is incorrect. Evaporation decreases with an increase in humidity because the air is already saturated with moisture, leaving less room for additional water vapor.

• C. It decreases with increase in temperature: This is incorrect. Evaporation increases with an increase in temperature because higher temperatures provide more energy for the liquid molecules to escape into the air as vapor.

• D. It increases with increase in wind speed: This is correct. Wind removes the water vapor from the surface, allowing more liquid to evaporate.