cbse sample paper book 2023-24 class 10

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Mayur Arya

Asked: December 27, 2023In: Class 10 Science

If two pea plants having round and green seeds (RRGg) are crossed, identify the percentage of the following with respect to the F1 generation: (a) gametes having both the round and yellow seed traits (b) offspring having the same genotype as the parents (c) offspring having the same phenotype as the parents

Gregor Mendel’s cross-breeding experiments with pea plants in the 19th century laid the foundation for modern genetics. His laws of inheritance revealed patterns of genetic transmission, contributing significantly to the understanding of heredity.

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.

Srushti

Asked: December 27, 2023In: Class 10 Science

In animals, hormones can be secreted by one organ and can act on multiple organs. Justify this statement by explaining the effect of a single animal hormone on three organs.

Hormones are chemical messengers produced by glands in the endocrine system. They regulate physiological processes, including growth, metabolism, mood, and reproduction, influencing target cells throughout the body to maintain homeostasis.