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CBSE Class 10 · Science

Heredity

Official NCERT chapter from Science (book code jesc1). ExamMaster notes are original teaching at CBSE Class 10 depth.

This lesson follows the official chapter “Heredity” in Science. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 10
  • Medium level
  • 8 concepts

1HEREDITY

Heredity is the pass-along of traits from parents to young as the lesson framed it: a feature you can name (height-band, a colour, a taught pea-story) that shows up again. Heredity is a pass-along, not a photocopy promise. One trait-pair is enough.

A fashion-photo “looks like mum” is a setting, not the test.

Figure. Tt crossed with Tt. Each cell is one parent allele from the row times one from the column. tt is the only hidden short case.

How it works

  1. Name a trait the lesson usedThe feature.
  2. Say it can pass along as taughtHeredity.
  3. Keep variation as allowed — not a failed headingPass-along, not identical.

2A living thing does jobs a toy cannot

A living thing does jobs a toy cannot — and some of those job-tools (a named trait) can be passed. The living-test still holds; heredity adds “the young can inherit a version of the tool”. A toy dog still fails the jobs; it also has nothing to inherit.

A wind-up toy that “looks inherited” is still a toy.

Figure. Living is a job test: take or make food, grow, respond. A toy that looks like a dog still fails those jobs.

How it works

  1. Name a living jobThe living-test.
  2. Name a trait that can passThe heredity add-on.
  3. Refuse the toy as both not-living and not-inheritingTwo fails.

3A part has a job

A part has a job — and a heritable part-version can show in the young (eye-colour-story or a taught plant-part, as listed). Part-plus-job is still the map; heredity says which version can travel. Do not invent a medical gene-lecture.

A rumour part-name is not the given.

Figure. Name a part by the job it does. Leaf, root, and mouth are three jobs you can point to, not a pretty picture.

How it works

  1. Name the part and its jobThe map.
  2. Name the version that can pass, if taughtThe heredity.
  3. Stay on the school trait-listSchool size.

4Food is material plus energy

Food is material plus energy for the body that will carry the traits — heredity does not replace nutrition. A well-fed young can still show a passed trait; a starve-story is a life-process fail, not “heredity off”. Keep the two headings honest.

Saying “they look alike because they ate the same” steals heredity into nutrition.

Figure. Food is both stuff and energy. Material plus energy is the whole claim; a calorie without a body of food is half the sentence.

How it works

  1. Keep food as the take-and-use jobNutrition stays.
  2. Keep the passed trait as heredityThe pass-along stays.
  3. Do not let one heading erase the otherTwo jobs.

5Waste is leftover after a job

Waste is leftover after a job — not a trait you inherit. Dumping leftovers is excretion; a family likeness is heredity. Mixing the leftover-word into “inherited dirt” is a heading-steal.

A dusty sibling photo is not an inherited waste-process.

Figure. A job yields a useful product and a leftover. Waste is the leftover after the job, not a second living thing.

How it works

  1. Name leftover-after-a-job as excretionWaste heading.
  2. Name the passed feature as heredityThe other heading.
  3. Keep them apartHonest drawers.

6Sort by a test, not by a pretty picture

Sort by a test, not by a pretty picture: a trait is what the lesson could score (round/wrinkled as a school story, or a named colour). Cute is not a heritable class. Sort the young by the same test you used on the parents, as taught.

A prettier pup is not a different species-test.

Figure. Sort by a test you can run, not by how pretty the object looks. Sink or float is one such test; look and colour are not.

How it works

  1. Name the taught trait-testRound or not; colour as listed.
  2. Apply it to parent and youngThe sort.
  3. Refuse cute as the classA test, not a look.

7Keep the claim at the scale you looked at

Keep the claim at the scale you looked at: this family, this pea-story, this taught ratio if one was given. “All living things forever” is too big. One generation-pair is enough for the claim.

A documentary of the whole biosphere is not your pea-tray.

Figure. A claim about one pea is not a claim about a field. Stay at the scale you actually looked at.

How it works

  1. Name the family or the tray you actually haveThe scale.
  2. State the pass-along at that scaleThe claim.
  3. If a sentence jumps to always-everywhere, shrink itHumble.

8A habitat is the place the jobs happen

A habitat is the place the jobs happen — heredity still needs living parents in a place, but the place is not the trait. A desert-lizard story can mix habitat-jobs with passed traits; keep which heading you are answering. Habitat does not inherit; organisms do.

Saying “the forest inherited green” is a swap.

Figure. A habitat is the place the living jobs happen. Pond is the landmark; feed and grow are the jobs inside it.

How it works

  1. Name the place as habitatThe jobs-happen-here word.
  2. Name the passed trait on the organismHeredity.
  3. Do not let the place steal the trait-wordTwo headings.
Heredity is
  1. A pass-along of a named trait — not a photocopy promise
  2. A toy looking like a dog
  3. The same as excretion

A feature that can show again, as taught.

Notes

  • Mapped to the official NCERT chapter “Heredity”. Original teaching only — no textbook sentences.
  • Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.

Recap

Hold these pegs from the official chapter “Heredity”. The wording is ExamMaster’s teaching, not a textbook recap.

HEREDITY
Heredity is the pass-along of traits from parents to young as the lesson framed it: a feature you can name (height-band, a colour, a taught pea-story) that shows up again.
A living thing does jobs a toy cannot
A living thing does jobs a toy cannot — and some of those job-tools (a named trait) can be passed.
A part has a job
A part has a job — and a heritable part-version can show in the young (eye-colour-story or a taught plant-part, as listed).
Food is material plus energy
Food is material plus energy for the body that will carry the traits — heredity does not replace nutrition.
Waste is leftover after a job
Waste is leftover after a job — not a trait you inherit.
Sort by a test, not by a pretty picture
Sort by a test, not by a pretty picture: a trait is what the lesson could score (round/wrinkled as a school story, or a named colour).

Practise Heredity

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