English Medium कक्षा १० - CBSE Question Bank Solutions for Science

When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

Two pea plants - one with round yellow seeds (RRYY) and another with wrinkled green (rryy) seeds produce F1 progeny that have round, yellow (RrYy) seeds.

When F1 plants are self-pollinated, which new combination of characters is expected in F2 progeny? How many seeds with these new combinations of characters will be produced when a total 160 seeds are produced in F2 generation? Explain with reason.

Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.

What will be set of genes present in the F1 generation?

Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.

Give a reason why only tall plants are observed in F1 progeny.

Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.

When F1 plants were self-pollinated, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F2 generation.

Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.

When F1 plants were cross-pollinated with plants having tt genes, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F2 generation.

When two hybrids rrTt and Rrtt are gassed, the phenotype ratio of offspring should be:

Identify the types of reaction mentioned above. Give one example for type in the form of a balanced chemical equation.

Identify the types of reaction mentioned above. Give one example for type in the form of a balanced chemical equation.

"Two different forms of carbon - diamond and graphite have different structure and very different physical properties even though their chemical properties are same." Explain why.

Draw a diagram showing flow of energy from solar input to a food chain having four trophic levels in an ecosystem. List two inference that can be drawn from the energy flow diagram.

Study the given figure of a Food web and identify the primary consumer in the food web:

State reasons for Myopia. With the help of ray diagrams, show the:

1. image formation by a myopic eye, and
2. correction of myopia using an appropriate lens.

A person is unable to see clearly a poster fixed on a distant wall. He however sees it clearly when standing at a distance of about 2 m from the wall.

1. Draw ray diagram to show the formation of image by his eye lens when he is far away from the wall.
2. List two possible reasons of this defect of vision.
3. Draw ray diagram to show the correction of this defect using appropriate lens.

Observe the following diagram and answer questions following it: 

1. Identify the defect of vision shown.
2. List its two causes.
3. Name the type of lens used for the correction of this defect.

Define the following terms in the context of a diverging mirror:

1. Principal focus
2. Focal length

Draw a labelled ray diagram to illustrate your answer.

Write the balanced equation for the following chemical reaction.

\[\ce{Hydrogen + Chlorine -> Hydrogen chloride}\]

Write the balanced equation for the following chemical reaction.

\[\ce{Barium chloride + Aluminium sulphate -> Barium sulphate + Aluminium chloride}\]