OAVS TGT Science Mock Test - 7 - OTET MCQ

Tartaric acid is a leavening agent which is mixed with baking powder to neutralize the bitterness produced by baking powder. It is an important food additive that is being used today. When dry base powder is added to acid forming a solution, it is mixed with cream of tartar which is chemically known as potassium bitartrate. 

Answer:
The use of forests is diverse and provides numerous benefits to society and the environment. However, one of the following options is not an actual use of forests. Let's analyze each option in detail:
A: Controls floods
Forests play a crucial role in controlling floods by absorbing excess water and reducing runoff. The roots of trees help to stabilize soil, preventing erosion and maintaining the water-holding capacity of the land.
B: Used to make paper
Forests are commonly used as a source of raw material for the production of paper. Trees are harvested and processed to obtain pulp, which is then used in the papermaking industry.
C: Causes soil erosion
This statement is incorrect. Forests actually help prevent soil erosion due to their dense vegetation and root systems that hold the soil in place, reducing the risk of erosion caused by wind or water.
D: Resin, gum, and drugs are obtained
Forests are a valuable source of various natural products. Resin and gum are obtained from certain tree species and are used in a variety of industries. Additionally, forests may contain medicinal plants that can be used to produce drugs.
Therefore, the correct answer is C: Causes soil erosion as it does not accurately represent the benefits and uses of forests.

All the Noble gases are placed in the group 18 and all elements are placed in the order of increasing atomic number. Therefore, the elements of atomic number before the Noble gas is placed in the before group of the period of Nobel gas which is group 17.

Tissues in a multicellular organism ensure division of labour, where different types of cells perform specific functions, contributing to the overall functioning of the organism.

 

Mendel's work was not recognized since 1900. Rediscovery of Mendel's work was done by three scientists, Karl Correns of Germany, Hugo de Vries of Netherlands, and Erich Von Tschermark of Austria. 

The most malleable metal is Gold (Au).It must be surprising as most of us have never come across gold foils or gold leaf that often in our lives unlike aluminium,iron,copper foils.One reason for this must be because of the cost of this noble metal,gold.

In automobile exhaust and smoke, dispersed phase is solid while air (gas) is dispersing medium. Therefore, they come under solid in gas category.

Incomplete combustion of fuel gives out sooty flame which contains unburnt carbon particles which deposits on the bottom of cooking utensils.

The food chain is a sequence of populations or organisms through which food and energy are passed on an ecosystem with the members of each trophic levels. A food chain shows who is eating whom. Here, organisms of higher trophic level derive its nutrients from organisms of a lower trophic level.

Both thorn of Bougainvillea and potato are modification of stem.

Definition of Color Blindness
Color blindness, also known as color vision deficiency, is a condition in which a person is unable to differentiate between certain colors. It is a typically inherited condition, although it can also be caused by certain diseases or eye injuries.
Factors to Determine Color Blindness
Color blindness is determined by a person's inability to perceive specific colors or a difficulty in differentiating between them. It does not affect a person's ability to see in the dark or in the light.
When is a person considered color blind?
A person is considered color blind when they cannot differentiate between colors accurately. This can manifest in various ways, such as:
- Inability to distinguish between certain colors, especially red and green.
- Difficulty identifying shades or hues of certain colors.
- Seeing colors as dull or washed out.
- Confusing certain colors with others.
Common Tests for Color Blindness
There are several tests that can be conducted to determine color blindness, such as:
- Ishihara color plates: This test involves identifying numbers or patterns within a series of colored circles.
- Farnsworth-Munsell 100 hue test: This test measures a person's ability to arrange color chips in a specific order.
- Anomaloscope: This device allows individuals to adjust the intensity of different colors to match one another.
Treatment and Coping Strategies
Unfortunately, there is no cure for inherited color blindness. However, people with color blindness can employ certain strategies to cope with the condition, such as:
- Using color-coded labels or markers.
- Relying on texture or pattern cues to distinguish between objects.
- Seeking assistance from devices or apps that can help identify colors.
Conclusion
Color blindness is a condition characterized by an individual's inability to differentiate between certain colors accurately. It is not related to a person's ability to see in the dark or in the light. Testing for color blindness can be done using various methods, and while there is no cure, individuals can develop coping strategies to manage their color vision deficiency.

The key difference between a natural ecosystem and an artificial ecosystem lies in their origin. Natural ecosystems develop and exist in nature independently, while artificial ecosystems are deliberately created by humans. This distinction impacts the interaction dynamics, biodiversity, and sustainability of these ecosystems.

Alloys are homogeneous mixtures of two or more elements. The elements could be two metals, or a metal and a non-metal.
Example: Brass is an example of a substitution alloy of copper and zinc.

Fermentation is a type of anaerobic respiration carried out primarily by fungi and bacteria. It involves the breakdown of carbohydrates and other organic compounds outside the cell in a liquid medium, leading to the formation of alcohol, organic acids, gases, etc.

The metal which exist as a liquid at room temperature is mercury. Non - metal which exist as a liquid at room temperature is bromine. 

Induces breeding is a very common technique that is carried out in the fishes. It stimulates the pituitary hormone in the fish breeders to increase the reproductive capacity.

Hormones are secreted only when required, in response to specific signals or stimuli in the body. This ensures that hormone levels are carefully regulated and maintained within the body. Unlike some substances that are produced continuously, hormones are released in precise amounts at specific times to fulfill their regulatory functions. This controlled secretion is essential for maintaining the body's overall balance and health.

The valency of hydrogen is 1 and the valency of sulphur is 2. To balance the valencies, we need 2 hydrogen atoms for every 1 sulphur atom.

Therefore, the formula of hydrogen sulphide is H₂S

According to all other fuels hydorgen is less polluting because Hydrogen gas is considered as cleanest fuel. Unlike carbon based fuels, hydrogen produces no harmful by-products on combustion. Only energy and clean water are produced.

Producers, such as green plants and blue-green algae, have the unique ability to produce their own food through photosynthesis. This process involves utilizing abiotic components like sunlight, water, and carbon dioxide to create glucose, serving as the foundation of the food chain in ecosystems.

Cell wall - Plant Cells
Power house of cell - Mitochondria
Photosynthesis - Chloroplast
Protein synthesis  Ribosomes

Recessive gene expression:
Recessive genes are genes that are only expressed when an individual carries two copies of the recessive allele. Let's break down the options provided and determine which conditions allow for the expression of recessive genes.
A: Homozygous condition
- In a homozygous condition, an individual carries two identical alleles for a particular gene.
- If both alleles are recessive, the recessive gene will be expressed.
- For example, if an individual has two recessive alleles for eye color (bb), they will have brown eyes because the recessive gene for brown eyes is expressed.
B: Heterozygous condition
- In a heterozygous condition, an individual carries two different alleles for a particular gene.
- If one allele is recessive and the other is dominant, the dominant gene will be expressed while the recessive gene remains hidden.
- For example, if an individual has one dominant allele and one recessive allele for eye color (Bb), the dominant gene for blue eyes will be expressed.
C: Both above conditions
- From the explanations above, we can see that recessive genes can be expressed in both homozygous and heterozygous conditions.
- Therefore, the answer is C: both above conditions.
D: None of these conditions
- This option is incorrect because recessive genes can be expressed in both homozygous and heterozygous conditions.
In conclusion, recessive genes can be expressed in both homozygous and heterozygous conditions.

Sexual Reproduction
- Sexual reproduction involves the fusion of gametes from two parents to produce offspring with a combination of genetic traits.
- This process ensures genetic diversity and variation within a population.
- It requires the involvement of specialized reproductive organs and mechanisms, such as fertilization and meiosis.
- In sexual reproduction, the offspring inherit traits from both parents, resulting in a unique combination of genetic material.
- The genetic variation introduced through sexual reproduction can enhance the adaptability and survival of a species in changing environments.
- Examples of sexual reproduction include the union of sperm and egg cells in animals, pollination in plants, and mating in fungi.
- It is a common method of reproduction in most multicellular organisms, including humans.
- In contrast, asexual reproduction involves the production of offspring from a single parent without the involvement of gametes or fertilization.
- Asexual reproduction leads to genetically identical offspring, limiting genetic diversity and adaptability.
Therefore, the correct answer is B: Sexual reproduction.

The group 1 elements in the periodic table are known as the alkali metals. They include lithium, sodium and potassium, which all react vigorously with air and water.

In gases, the atoms are much more spread out than in solids or liquids, and the atoms collide randomly with one another. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

Directional growth movements in response to stimuli are termed as tropism.

The correct option is C.
Zero on the Celsius scale (0°C) is the equivalent to 273.15K. 1-degree rise in Celsius scale is equivalent to the 1-degree rise in the Kelvin scale.
 Conversion Formula for the temperature is:C=K−273
300-273= 27 C

Potential Site for Harnessing Tidal Energy in India:
The potential site for harnessing tidal energy in India is the Gulf of Kutch in Gujarat.
- Gulf of Kutch in Gujarat:
- Located in the western state of Gujarat, the Gulf of Kutch offers a favorable location for tidal energy harnessing.
- The Gulf of Kutch experiences strong tidal currents due to its proximity to the Arabian Sea.
- The region has a significant tidal range, with high and low tides occurring at regular intervals.
- The presence of narrow channels and creeks in the gulf helps to enhance the tidal energy potential.
- The area has been identified as suitable for setting up tidal energy projects due to its favorable tidal conditions.
- The development of tidal energy in the Gulf of Kutch can contribute to India's renewable energy goals and reduce reliance on fossil fuels.
Other Options:
- Northern areas: The northern areas of India, such as the Himalayan region, do not have significant tidal movements and are not suitable for harnessing tidal energy.
- Kalpakkam in Tamil Nadu: Kalpakkam is located on the east coast of India and does not have strong tidal currents, making it less suitable for tidal energy harnessing.
- Malabar coast: The Malabar coast, located in Kerala, experiences moderate tidal movements but may not have the ideal conditions for large-scale tidal energy projects.
In conclusion, the Gulf of Kutch in Gujarat is the potential site for harnessing tidal energy in India due to its strong tidal currents, significant tidal range, and favorable conditions for tidal energy projects.

The species that does not contain neutrons is option A: H (Hydrogen).
Explanation:
Hydrogen is the first element in the periodic table and has an atomic number of 1. It consists of only one proton in its nucleus and no neutrons. Neutrons are subatomic particles that have no charge and contribute to the mass of an atom.
Let's analyze the other options:
B: Li²
- Lithium (Li) is the element with atomic number 3.
- The superscript 2 indicates the charge, not the number of neutrons.
- The nucleus of lithium consists of 3 protons and a variable number of neutrons.
C: C
- Carbon (C) is the element with atomic number 6.
- It has 6 protons in its nucleus and a variable number of neutrons.
- Carbon has stable isotopes with 6, 7, and 8 neutrons.
D: O
- Oxygen (O) is the element with atomic number 8.
- It has 8 protons in its nucleus and a variable number of neutrons.
- Oxygen has stable isotopes with 8, 9, 10, 11, 12, 13, 14, 15, and 16 neutrons.
Therefore, among the given options, only Hydrogen (H) does not contain neutrons in its nucleus.

Exhaustible Natural Resources:

• Solar radiation: Solar radiation is an example of an inexhaustible natural resource as it is constantly replenished by the sun.


• Air: Air is also an example of an inexhaustible natural resource. It is composed of various gases and is constantly renewed through natural processes.


• Minerals: Minerals are an example of an exhaustible natural resource as they are finite in quantity and take millions of years to form. Once these minerals are extracted and used, they cannot be replaced within a human timescale.


• Water: Water can be considered as both an exhaustible and an inexhaustible natural resource, depending on the context. While water is constantly recycled through the water cycle, certain sources of freshwater, such as underground aquifers, can be depleted over time if not managed sustainably.

Detailed
Among the given options, minerals are the only exhaustible natural resource. Here is a breakdown of each option:
- Solar radiation: Solar radiation is an example of an inexhaustible natural resource. It is constantly replenished by the sun and can be harnessed as a source of renewable energy.
- Air: Air is also an example of an inexhaustible natural resource. It is composed of various gases and is constantly renewed through natural processes such as photosynthesis and respiration.
- Minerals: Minerals are an example of an exhaustible natural resource. They are finite in quantity and take millions of years to form through geological processes. Once these minerals are extracted and used for various purposes, they cannot be replaced within a human timescale.
- Water: Water can be considered as both an exhaustible and an inexhaustible natural resource, depending on the context. While water is constantly recycled through the water cycle and is generally renewable, certain sources of freshwater, such as underground aquifers, can be depleted over time if not managed sustainably.
In conclusion, minerals are the only exhaustible natural resource among the given options.