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+ 6 more by raindelu
+ 2 more by vanshika_d
| ICSE Class X Prelims 2025 : Geography (Villa Theresa High School (VTS), Mumbai) |
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(b) Soil erosion occurs more frequently during the monsoon season.
Reasoning: During monsoon season, heavy rainfall and strong winds are common. These conditions lead to increased soil erosion for several reasons:
1. Heavy rain can dislodge soil particles and wash them away.
2. Increased water flow in rivers and streams can erode banks.
3. Strong winds can carry away loose topsoil, especially in dry areas.
4. Saturated soil is more susceptible to landslides and mass movements.
(c) Red soil needs fertilization for better agricultural productivity.
Reasoning: Red soils are typically:
1. Low in organic matter and nutrients, especially nitrogen and phosphorus.
2. Often acidic, which can limit nutrient availability to plants.
3. Prone to leaching of nutrients due to their high iron oxide content.
4. Often found in tropical and subtropical regions with high rainfall, which can wash away nutrients.
Fertilization helps overcome these limitations by:
1. Adding essential nutrients to the soil.
2. Improving soil structure and water retention capacity.
3. Neutralizing soil acidity if lime is added along with fertilizers.
4. Enhancing microbial activity in the soil, which aids in nutrient cycling.
prashy22533
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+ 13 more by 101error
| ISC Class XII Prelims 2024 : Physics : Preboard |
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Multiplication factor of a fissionable mass in a nuclear fission is defines as the ratio of the number of neutrons present at the beginning of the present generation to the number of neutrons present at the beginning of the past generation.
101error
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| ICSE Class X Prelims 2023 : Physics (GEMS Modern Academy, Dubai) Mock |
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Here's a ray diagram showing how a convex lens can be used as a magnifying glass:
[This answer would typically include a hand-drawn diagram, but I cannot generate or manipulate images. The diagram would show:]
1. An object placed between the focal point and the lens
2. Three key rays:
- A ray parallel to the principal axis, refracting through the focal point on the other side
- A ray through the center of the lens, continuing straight
- A ray through the focal point on the object side, refracting parallel to the principal axis
3. These rays converging to form a virtual, enlarged image on the same side as the object
The diagram demonstrates that when an object is placed within the focal length of a convex lens, it produces an enlarged, upright, and virtual image, which is the principle behind a magnifying glass.
abhi278
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+ 2 more by abhi278
| ICSE Class X Prelims 2023 : Physics (GEMS Modern Academy, Dubai) Mock |
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Here's a ray diagram showing how a convex lens can be used as a magnifying glass:
[This answer would typically include a hand-drawn diagram, but I cannot generate or manipulate images. The diagram would show:]
1. An object placed between the focal point and the lens
2. Three key rays:
- A ray parallel to the principal axis, refracting through the focal point on the other side
- A ray through the center of the lens, continuing straight
- A ray through the focal point on the object side, refracting parallel to the principal axis
3. These rays converging to form a virtual, enlarged image on the same side as the object
The diagram demonstrates that when an object is placed within the focal length of a convex lens, it produces an enlarged, upright, and virtual image, which is the principle behind a magnifying glass.
abhi278
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| ICSE Class X Prelims 2023 : Physics (GEMS Modern Academy, Dubai) Mock |
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Here's a well-labelled circuit diagram for verifying Ohm's law:
[A simple circuit diagram would be drawn here, including the following components:]
- Battery (labeled with + and - terminals)
- Resistor (labeled R)
- Ammeter (labeled A, connected in series)
- Voltmeter (labeled V, connected in parallel across the resistor)
- Switch (labeled S)
- Connecting wires
Key labels:
1. Battery: Source of electrical energy
2. Resistor: Component whose resistance is being measured
3. Ammeter: Measures current flowing through the circuit
4. Voltmeter: Measures potential difference across the resistor
5. Switch: To open or close the circuit
This setup allows for measuring current and voltage simultaneously while varying the resistance, enabling verification of Ohm's law (V = IR).
abhi278
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+ 18 more by sav4356
| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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a) thicker and more rounded.
Reasoning: When looking at a close object, the lens in the eye becomes thicker and more rounded. This process is called accommodation. The ciliary muscles contract, allowing the lens to become more convex, which increases its refractive power. This change in shape allows the eye to focus on nearby objects by bending light rays more sharply onto the retina.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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c) Dimpled cheek
Reasoning: In humans, dimpled cheeks are a recessive trait. This means that an individual must inherit the gene for dimpled cheeks from both parents to express the trait. Brown eyes, attached earlobes, and thick lips are typically dominant traits, meaning they can be expressed even if only one parent passes on the gene.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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After three days, the likely readings on the spring balances would be:
Shoot X: 48 grams
Shoot Y: 50 grams
Explanation:
Shoot X has its leaves removed, which greatly reduces transpiration. As a result, it will lose less water and its weight will decrease only slightly.
Shoot Y has intact leaves, allowing for normal transpiration. It will lose more water through its leaves, resulting in a greater decrease in weight.
The initial weight for both shoots was 50 grams. Shoot X lost only 2 grams (50 - 48 = 2), while Shoot Y lost 5 grams (50 - 45 = 5) due to higher transpiration rates.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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c. C
Cell C in the diagram represents a stomatal pore or guard cell. Most water evaporates from these cells during transpiration. Stomata are specialized structures on the leaf surface that control gas exchange and water loss. When the stomata are open, water vapor can escape from the leaf interior, driving the process of transpiration. The cells surrounding the stomatal pore (guard cells) regulate its opening and closing, thus controlling the rate of water loss from the leaf.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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b. Progesterone
Progesterone is the hormone responsible for maintaining the thickened lining of the uterus after fertilization. It prepares the uterus for potential pregnancy and helps maintain the uterine lining if fertilization occurs. Progesterone levels increase after ovulation and remain high if pregnancy occurs, supporting the developing embryo and preventing menstruation.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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b. glucose formed in photosynthesis soon gets converted into starch.
Starch is used as a measure of photosynthesis because glucose, the immediate product of photosynthesis, is quickly converted to starch for storage in plants. Starch is insoluble and doesn't move around in the plant, making it easier to detect and measure. This conversion helps maintain a concentration gradient, allowing for continued glucose production during photosynthesis.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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c. Days 13 - 16
Based on the graph shown, ovulation is most likely to occur around day 14 of the menstrual cycle. The graph shows a sharp peak in the hormone levels around this time, which corresponds to the LH surge that triggers ovulation. The fertile window typically extends a few days before and after ovulation, so days 13-16 represent the period when a woman is most likely to ovulate.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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a. 25%
When two heterozygous plants (Aa x Aa) are crossed, the possible genotype combinations of the offspring are:
AA (25%), Aa (50%), aa (25%)
Only the aa genotype is homozygous recessive, which occurs in 25% of the offspring. This can be visualized using a Punnett square:
A a
A AA Aa
a Aa aa
Therefore, the probability of an offspring being homozygous recessive is 25%.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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a. Both A and R are true, and R is the correct explanation for A.
The assertion that testes are located outside the human body is correct. The reason given - that sperm need a lower temperature for maturation - is also true and directly explains why the testes are positioned externally. Sperm production and maturation occur optimally at a temperature slightly below normal body temperature, which is achieved by the scrotum's position outside the body cavity.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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X, X, XX
The correct sex chromosomes shown in the image are:
Egg: X
Sperm: X
Fertilized egg: XX
This combination results in a female embryo. The egg always contains an X chromosome, while the sperm can carry either X or Y. When an X-carrying sperm fertilizes the egg, the result is XX, which determines a female offspring.
sav4356
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| ICSE Class X Prelims 2025 : Biology (Jamnabai Narsee School (JNS), Mumbai) |
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c) C
The structure that refracts light in the human eye is the lens, which is labeled as C in the diagram.
Reasoning: The lens is a transparent, flexible structure in the eye that changes shape to focus light onto the retina. It refracts (bends) incoming light rays to create a clear image. The other labeled parts in the diagram have different functions:
A - likely refers to the cornea, which also helps refract light but is not the main refractive structure
B - appears to be the iris, which controls the amount of light entering the eye
D - is likely the retina, which detects light and converts it into neural signals
The lens (C) is the primary structure responsible for adjusting the focus of light as it enters the eye, making it the correct answer for which structure refracts light.
sav4356
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| ICSE Class X Prelims 2025 : English Paper 2 (English Literature) (Dhirubhai Ambani International School (DAIS), Mumbai) |
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c. It changed societal views about physical traits.
Reasoning: Based on the context provided in the question, Adjoa's win seems to have challenged and changed existing societal perceptions about physical traits. In many traditional societies, certain physical characteristics are often associated with specific abilities or roles. Adjoa's victory likely demonstrated that physical appearance or traits do not necessarily determine one's capabilities or potential for success. This achievement would be significant in a village setting as it could help break down stereotypes and encourage a more inclusive and open-minded approach to judging individuals based on their abilities rather than their appearance.
idkwhoiam07
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