All questions of April Week 1 for NEET Exam

Homeostasis is how the body keeps conditions inside it the same. Scientists describe it as the maintenance of a constant internal environment. Two examples of things that the body keeps the same are: body temperature at 37degC.

Species - A group of organisms that interbreed and produce fertile offspring. population - A group of organisms of the same species living in the same area at the same time, and which are capable of interbreeding. community - A group of populations living and interacting with each other in a common habitat.

Binomial Nomenclature was formly introduced by Swedish scientist Carl Linnaeus. In the binomial Nomenclature two terms are used to debote a species of living organisms, the first one indicate the genus and second one the specific epihet.Example:-Homo sapiens is the scientific name of human.

Primates belong to the class Mammalia, and the correct order for mammals that includes animals like cats and dogs is Carnivora.
Other options are incorrect because they mention incorrect combinations of order and class.

Photosynthesis takes place inside plant cells in small things called chloroplasts. Chloroplasts contain a green substance called chlorophyll. This absorbs the light energy needed to make photosynthesis happen.

Understanding the Systems of Units
When discussing systems of units, it's crucial to know how they relate to fundamental quantities such as mass, length, and time. Let’s break down each system mentioned:
FPS (Foot-Pound-Second)
- This system is based on units of length (foot), mass (pound), and time (second).
- It is primarily used in the United States for everyday measurements.
CGS (Centimeter-Gram-Second)
- This system is based on units of length (centimeter), mass (gram), and time (second).
- It is commonly used in scientific contexts, particularly in physics and chemistry.
MKS (Meter-Kilogram-Second)
- MKS uses the meter for length, kilogram for mass, and second for time.
- It is often used in engineering and scientific applications.
SI (International System of Units)
- The SI system is the modern form of the metric system and includes additional base units beyond just mass, length, and time.
- Key base units include:
- Ampere (electric current)
- Kelvin (temperature)
- Mole (amount of substance)
- Thus, it is not solely based on mass, length, and time.
Conclusion
Therefore, the correct answer is option 'B' because the SI system incorporates additional fundamental units, making it more comprehensive than just the basic dimensions of mass, length, and time. This distinction highlights the SI system's versatility and its role in scientific standardization globally.

Understanding Shear Modulus of Rigidity
Shear modulus, also known as the modulus of rigidity, is a measure of a material's ability to resist shear deformation. The dimensions of shear modulus can be derived from the relationship between stress and strain.
Definition of Shear Modulus
- Shear modulus (G) is defined as the ratio of shear stress to shear strain.
- Mathematically, G = Shear Stress / Shear Strain.
Dimensions of Shear Stress
- Shear stress (τ) is defined as force (F) per unit area (A).
- Dimensions of force: M1L1T-2 (mass x acceleration).
- Dimensions of area: L2.
- Therefore, the dimensions of shear stress are:
τ = F/A = (M1L1T-2) / (L2) = M1L-1T-2.
Dimensions of Shear Strain
- Shear strain (γ) is the ratio of the change in the shape of the material to its original shape.
- It is a dimensionless quantity, so its dimensions are 1.
Calculating Dimensions of Shear Modulus
- Using the definitions, we can find the dimensions of shear modulus (G):
G = τ / γ = (M1L-1T-2) / 1 = M1L-1T-2.
Conclusion
- The correct dimensions of shear modulus of rigidity are:
ML-1T-2 (option D).
This aligns with the fundamental principles of mechanics and material science, validating the choice. Understanding these dimensions is crucial for applications in engineering and physics.

The taxonomic hierarchy generally includes 8 primary categories (kingdom, phylum, class, order, family, genus, species, variety) and not 7 obligate categories.
The other statements are correct, based on the classification system used in biology.

Understanding the Reaction
To determine the number of moles of ferrous oxalate oxidized by one mole of KMnO4, we need to analyze the redox reaction between these substances.
Oxidation and Reduction
- KMnO4 acts as an oxidizing agent in acidic medium, where it gets reduced from Mn(VII) to Mn(II).
- Ferrous oxalate (FeC2O4) is oxidized to ferric ion (Fe3+) and carbon dioxide.
Balanced Chemical Equation
The balanced redox reaction can be represented as:
MnO4- + Fe2+ + C2O4^2- → Mn2+ + Fe3+ + 2CO2
This equation shows that one mole of KMnO4 reacts with ferrous ions (Fe2+) and oxalate ions (C2O4^2-).
Mole Ratio
- From the balanced equation, we observe that:
- 1 mole of KMnO4 reacts with 5 moles of electrons.
- Ferrous oxalate (FeC2O4) donates 2 electrons per mole of Fe2+ and 2 electrons from each mole of C2O4^2-.
Calculating Moles of Ferrous Oxalate
- Since each ferrous oxalate provides 2 moles of electrons, the total electrons involved from ferrous oxalate are:
- 2 moles of electrons from Fe2+ and 2 moles from C2O4^2- contribute to 4 moles of electrons.
To fully balance, it can be concluded that:
- 1 mole of KMnO4 oxidizes 5 moles of ferrous oxalate.
Thus, the number of moles of ferrous oxalate oxidized by one mole of KMnO4 is:
Final Answer
- 5/3 moles (Option D)

Understanding Taxonomic Hierarchy
Taxonomy is the science of classification of organisms, and it organizes them into hierarchical categories. The correct sequence for the mango (Mangifera indica) in ascending order is crucial for understanding its scientific classification.
Correct Sequence Explained
The correct answer is option 'B':
Mangifera → Anacardiaceae → Sapindales → Dicotyledonae → Angiospermae
Breakdown of Taxonomic Categories
- Mangifera:
- The genus of the mango, which includes various species of mangoes.
- Anacardiaceae:
- The family that Mangifera belongs to. This family includes other plants like cashews and poison ivy.
- Sapindales:
- The order that encompasses several families, including Anacardiaceae. It is a broader classification that groups related families together.
- Dicotyledonae:
- A class of flowering plants (angiosperms) that typically have two embryonic leaves or cotyledons.
- Angiospermae:
- The highest taxonomic category in this sequence, representing all flowering plants. This is the largest group of plants in terms of diversity.
Why Other Options are Incorrect
- Option A: Incorrect as it places Dicotyledonae before Sapindales.
- Option C: Incorrect because it starts with Angiospermae, which is the highest rank, not the lowest.
- Option D: Incorrect as it also places Angiospermae first and disrupts the hierarchy.
Conclusion
Understanding the correct order of these taxonomic categories is essential for biological classification, providing a clear framework to identify and study organisms like the mango.