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Prasant

Asked: December 29, 2023In: Class 10 Science

In a cross between pea plants having round green seeds and wrinkled yellow seeds, what progeny is expected in F1 and F2 generation? (ii) What would be the impact on the ratio of F2 generation, if F1 progeny plants inherited a single whole gene set from each parent? Give reason for your answer.

Mendel’s pea plant experiments involved controlled crosses. Traits like flower color were studied. Cross-pollination of parental plants with specific traits led to predictable ratios in the offspring, revealing principles of inheritance.

Prasant

Asked: December 29, 2023In: Class 10 Science

Flow of energy in a food chain is unidirectional. Justify the statement.

A food chain illustrates the transfer of energy in an ecosystem, showing the sequential flow of organisms consuming one another. Producers, consumers, and decomposers play vital roles in sustaining this dynamic process.

Prasant

Asked: December 29, 2023In: Class 10 Science

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm. a) Use lens formula to find the distance of image from the lens. b) Draw a ray diagram to justify your answer in part (a).

A concave lens is a transparent optical device with curved surfaces that diverges light rays. It causes parallel light rays to spread out and is commonly used in correcting nearsightedness in eyeglasses.

Prasant

Asked: December 29, 2023In: Class 10 Science

A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image formed.

A convex lens is a transparent optical device with curved surfaces that converges light rays, causing them to meet at a focal point. It is used in magnifying glasses, cameras, and eyeglasses.

Prasant

Asked: December 27, 2023In: Class 10 Science

A metal X is obtained from its chloride salt by exposure to sunlight. (a) In which section of the reactivity series of metals- top, middle or bottom, is it likely to be placed? Justify your answer. (b) Identify the type of reaction the chloride salt of metal X undergoes on exposure to sunlight.

Exposure of certain metals to sunlight may lead to photochemical reactions, causing oxidation or corrosion. Ultraviolet (UV) radiation can accelerate these processes, affecting the appearance and properties of the metal.

Prasant

Asked: December 27, 2023In: Class 10 Science

Equal sized bars of aluminium and iron are exposed to the environment as shown below. Which of them is likely to corrode till the level marked by the line FIRST? Justify your answer.

Exposed iron reacts with oxygen and moisture in the environment, forming iron oxide, commonly known as rust. This corrosion weakens the metal, leading to degradation and loss of structural integrity.

Prasant

Asked: December 27, 2023In: Class 10 Science

A helical coil whose length is greater than its diameter is connected to a battery as shown below. (a) How does the magnetic field at point P compare with the magnetic field at point Q? Justify your answer. (b) State one way in which the strength of the magnetic field inside a current carrying helical coil can be changed?

A helical coil is a structure formed by winding a flexible material, like a tube or wire, into a spiral shape. It is commonly used in heat exchangers and other fluid systems.

Prasant

Asked: December 22, 2023In: Class 10 Science

Explain the processes of aerobic respiration in mitochondria of a cell and anaerobic respiration in yeast and muscle with the help of word equations.

CBSE Science Class 10 Sample Question Paper 2023-2024 free download with answers

Prasant

Asked: December 22, 2023In: Class 10 Science

Explain giving reasons the bending of the shoot tip of a plant towards light source coming from one side of the plant.

CBSE class 10 Science sample question paper 2023-2024 with solutions

Prasant

Asked: December 22, 2023In: Class 10 Science

In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white colour (pp). Explain the inheritance pattern of F1 and F2 generations with the help of a cross following the rules of inheritance of traits. State the visible characters of F1and F2 progenies.

NCERT CBSE Class 10 Science Sample Question Paper 2023-2024

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Prasant

In a cross between pea plants having round green seeds and wrinkled yellow seeds, what progeny is expected in F1 and F2 generation? (ii) What would be the impact on the ratio of F2 generation, if F1 progeny plants inherited a single whole gene set from each parent? Give reason for your answer.

Flow of energy in a food chain is unidirectional. Justify the statement.

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm. a) Use lens formula to find the distance of image from the lens. b) Draw a ray diagram to justify your answer in part (a).

A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image formed.

A metal X is obtained from its chloride salt by exposure to sunlight. (a) In which section of the reactivity series of metals- top, middle or bottom, is it likely to be placed? Justify your answer. (b) Identify the type of reaction the chloride salt of metal X undergoes on exposure to sunlight.

Equal sized bars of aluminium and iron are exposed to the environment as shown below. Which of them is likely to corrode till the level marked by the line FIRST? Justify your answer.

Explain the processes of aerobic respiration in mitochondria of a cell and anaerobic respiration in yeast and muscle with the help of word equations.

Explain giving reasons the bending of the shoot tip of a plant towards light source coming from one side of the plant.

In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white colour (pp). Explain the inheritance pattern of F1 and F2 generations with the help of a cross following the rules of inheritance of traits. State the visible characters of F1and F2 progenies.

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