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Animal Survival and Growth - Life Cycles of Insects and Animals

Grade 4CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Life Cycle: The series of developmental stages that a living organism passes through from the beginning of its life until its death.

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Reproduction: The biological process by which organisms produce offspring. This ensures the survival of the species.

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Oviparous Animals: Animals that lay eggs to reproduce. Examples include birds, fish, and most insects.

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Viviparous Animals: Animals that give birth to live young ones and nurse them with milk. Examples include humans, dogs, and whales.

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Metamorphosis: A process of profound change in form from one stage to the next in the life history of an organism, such as a caterpillar turning into a butterfly.

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Molting: The process where an insect or animal sheds its old skin, shell, or feathers to allow for new growth.

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Four Stages of Insect Life Cycle: Some insects like butterflies and houseflies follow the cycle: Egg→Larva→Pupa→AdultEgg \rightarrow Larva \rightarrow Pupa \rightarrow Adult.

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Three Stages of Insect Life Cycle: Some insects like cockroaches and grasshoppers follow the cycle: Egg→Nymph→AdultEgg \rightarrow Nymph \rightarrow Adult.

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Incubation: The process of keeping eggs warm, often at a constant temperature like 37∘C37^{\circ}C to 40∘C40^{\circ}C, so they can hatch.

📐Formulae

Butterfly Life Cycle: Egg→Larva (Caterpillar)→Pupa (Chrysalis)→Adult\text{Butterfly Life Cycle: } Egg \rightarrow Larva \text{ (Caterpillar)} \rightarrow Pupa \text{ (Chrysalis)} \rightarrow Adult

Cockroach Life Cycle: Egg→Nymph→Adult\text{Cockroach Life Cycle: } Egg \rightarrow Nymph \rightarrow Adult

Frog Life Cycle: Egg→Tadpole→Froglet→Adult\text{Frog Life Cycle: } Egg \rightarrow Tadpole \rightarrow Froglet \rightarrow Adult

Incubation Condition: Heat+Time=Hatching\text{Incubation Condition: } \text{Heat} + \text{Time} = \text{Hatching}

💡Examples

Problem 1:

A scientist observes an insect that undergoes shedding of its skin five times before it becomes a fully grown adult. What is this process called, and what are the stages of this specific insect's life cycle if it does not have a pupa stage?

Solution:

The process is called molting. Since it does not have a pupa stage, it follows a 3-stage life cycle: Egg→Nymph→AdultEgg \rightarrow Nymph \rightarrow Adult.

Explanation:

Insects like cockroaches do not have a resting pupa stage. Their young ones, called nymphs, look like mini-adults and must shed their hard outer skin (molt) several times to grow larger.

Problem 2:

Explain the transformation of a frog from its birth to its adult stage using scientific terms.

Solution:

Egg→hatchTadpole→metamorphosisAdult FrogEgg \xrightarrow{\text{hatch}} Tadpole \xrightarrow{\text{metamorphosis}} Adult\text{ Frog}.

Explanation:

Frogs undergo metamorphosis. A tadpole lives in water and breathes through gills (like a fish), but through growth, it develops lungs and legs to become an adult frog that can live on land.

Problem 3:

Which group of animals produces milk for their young ones, and what is the mathematical probability that an oviparous animal will give birth to live young?

Solution:

Mammals produce milk. The probability is 00 because oviparous animals, by definition, lay eggs.

Explanation:

Viviparous animals (mammals) have mammary glands to feed their young. Oviparous animals, such as birds or reptiles, always lay eggs; they do not give birth to live young.