[3 Marks Each] QUE-ANS

Question 13 Marks

What are the similarities and distinguishing features in the life cycles of a mosquito and a frog?

Answer

Similarities
$\rightarrow $ Both begin life as eggs.
$\rightarrow $ Both have a larval stage (tadpole in frogs, larvae in mosquitoes) that is aquatic. Distinguishing Features
Mosquitoes have four stages
Egg $\rightarrow $ Larva $\rightarrow $ Pupa $\rightarrow $ Adult
Respiration: Larvae and pupae breathe through siphons. Frog has four stages
Egg $\rightarrow $ Tadpole $\rightarrow $ Froglet $\rightarrow $ Adult
Respiration: Tadpoles have gills, adults have lungs and can respire through their skin.

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Question 23 Marks

The table (See $NCERT$ Textbook, Page $204$) shows some data. Study the data and try to find out examples appropriate for the conditions given in the second and third columns. If you think that an example for any of the conditions given below is not possible, explain why?

S. no.	Does it grow?	Does it respire?	Example	Remarks
$1.$	No	No
$2.$	No	Yes
$3.$	Yes	No
$4.$	Yes	Yes

Answer

S. no.	Does it grow?	Does it respire?	Example	Remarks
$1.$	No	No	Rock	Non-living, No growth or respiration
$2.$	No	Yes	Virus	Viruses are non-living outside host cells but respire in host
$3.$	Yes	No	Crystals (salt).	Non-living can perform tasks but does not respire
$4.$	Yes	Yes	Humans, Plants	Living beings

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Question 33 Marks

List the similarities and differences in life cycles of plants and animals.

Answer

Similarities in Life Cycles of Plants and Animals	Differences in Life Cycles of Plants and Animals
$(i)$ Development Stage: Both have distinct stages of development (e.g., germination, flowering in plants; egg, larva, adult in animals).	$(i)$ Respiration: While both respire, the mechanisms differ; animals use lungs or gills, plants use stomata and lenticels.
$(ii)$ Growth: Both plants and animals grow from a small initial stage (seed or embryo) into a mature form.	$(ii)$ Growth Patterns: Plants exhibit indeterminate growth (can grow throughout their life), while animals have determinate growth (stop growing after reaching maturity).
$(iii)$ Reproduction: Both undergo process to produce offspring (seeds for plants and young ones for animals).	$(iii)$ Reproductive Structures: Animals have specialized organs for reproduction, while plants use flowers, cones, or spores.

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Question 43 Marks

Explain the life cycle of a frog.

Answer

The life cycle of a frog begins with a fertilized egg. The fertilized egg develops into a tadpole. The fertilized egg and tadpole stages are found in the water in the spring. The tadpole develops into an immature froglet, then it is transformed via the process of metamorphosis into an adult frog. The tail is absorbed and the external gills are replaced by lungs. The adult frog lives on land and in the water and breathes air.

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Science [3 Marks Each] QUE-ANS

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