CHAPTER 10: LIVING CREATURES: EXPLORING THEIR CHARACTERISTICS WORKSHEET
CHAPTER 10
LIVING CREATURES: EXPLORING THEIR CHARACTERISTICS WORKSHEET
A. Multiple Choice Questions
1. Which of the following is a characteristic of living beings?
(a) They never grow
(b) They respire
(c) They never reproduce
(d) They do not respond to changes
Answer: (b) They respire
2. Which process involves taking in and giving out air?
(a) Excretion
(b) Reproduction
(c) Breathing
(d) Growth
Answer: (c) Breathing
3. Which part of a plant helps in the exchange of gases?
(a) Roots
(b) Flowers
(c) Stomata
(d) Fruits
Answer: (c) Stomata
4. Which of the following is an example of a response to a stimulus?
(a) A stone remaining still
(b) Touch-me-not folding its leaves when touched
(c) A book lying on a table
(d) A chair remaining in a room
Answer: (b) Touch-me-not folding its leaves when touched
5. What is the process by which living organisms produce young ones of their kind?
(a) Respiration
(b) Reproduction
(c) Excretion
(d) Germination
Answer: (b) Reproduction
6. Which of the following is required for seed germination?
(a) Suitable amount of water
(b) Air
(c) Suitable conditions of light/darkness depending on the seed
(d) All of these
Answer: (d) All of these
7. What does water do during seed germination?
(a) Hardens the seed coat
(b) Softens the seed coat
(c) Stops embryo development
(d) Removes air from the soil
Answer: (b) Softens the seed coat
8. Which part of a germinating seed develops into the young plant?
(a) Embryo
(b) Seed coat only
(c) Fruit
(d) Pupa
Answer: (a) Embryo
9. In which direction does the root generally grow?
(a) Upward
(b) Downward
(c) Sideways only
(d) Towards the flower
Answer: (b) Downward
10. Which scientist studied responses in plants using the crescograph?
(a) C. V. Raman
(b) Jagadish Chandra Bose
(c) A. P. J. Abdul Kalam
(d) Homi Bhabha
Answer: (b) Jagadish Chandra Bose
11. What is the correct life cycle of a mosquito?
(a) Egg → Pupa → Larva → Adult
(b) Egg → Larva → Pupa → Adult
(c) Larva → Egg → Adult → Pupa
(d) Egg → Adult → Larva → Pupa
Answer: (b) Egg → Larva → Pupa → Adult
12. Which stage of a mosquito comes between larva and adult?
(a) Tadpole
(b) Froglet
(c) Pupa
(d) Embryo
Answer: (c) Pupa
13. What is the young aquatic stage of a frog called?
(a) Larva
(b) Tadpole
(c) Pupa
(d) Froglet
Answer: (b) Tadpole
14. What is the advantage of a tadpole's tail?
(a) It helps in flying
(b) It helps in swimming
(c) It helps in breathing air
(d) It helps in producing eggs
Answer: (b) It helps in swimming
15. Which is the correct sequence in the life cycle of a frog?
(a) Egg → Tadpole → Froglet → Adult
(b) Egg → Pupa → Adult
(c) Egg → Larva → Pupa → Adult
(d) Seed → Seedling → Adult
Answer: (a) Egg → Tadpole → Froglet → Adult
B. Fill in the Blanks
1. The process by which living organisms produce young ones is called __________.
Answer: Reproduction
2. Plants exchange gases through tiny openings called __________.
Answer: Stomata
3. Removal of waste substances from the body is called __________.
Answer: Excretion
4. The process in which a seed begins to grow into a seedling is called __________.
Answer: Germination
5. Water softens the __________ of a seed during germination.
Answer: Seed coat
6. The young stage of a frog is called a __________.
Answer: Tadpole
7. The stage between larva and adult in a mosquito is called __________.
Answer: Pupa
8. The tadpole's __________ helps it to swim in water.
Answer: Tail
9. The scientist who used a crescograph to study plant responses was __________.
Answer: Jagadish Chandra Bose
10. A young frog with developing legs is called a __________.
Answer: Froglet
C. True or False
1. All living organisms show growth.
Answer: True
2. Cars are living organisms because they can move.
Answer: False
3. Plants can respond to stimuli.
Answer: True
4. Respiration occurs only in animals.
Answer: False
5. Water is needed for seed germination.
Answer: True
6. A mosquito has egg, larva, pupa and adult stages.
Answer: True
7. A frog has a pupa stage.
Answer: False
8. The root generally grows downward.
Answer: True
9. A tadpole uses its tail for swimming.
Answer: True
10. A wooden log is a living organism because it came from a tree.
Answer: False
D. Match the Following
| Column A | Column B |
|---|---|
| 1. Stomata | (a) Swimming |
| 2. Excretion | (b) Plant response |
| 3. Tadpole | (c) Gas exchange |
| 4. Mimosa | (d) Removal of wastes |
| 5. Pupa | (e) Mosquito life cycle |
| 6. Germination | (f) Seed begins to grow |
| 7. Froglet | (g) Young frog |
| 8. Crescograph | (h) Plant responses |
| 9. Root | (i) Grows downward |
| 10. Reproduction | (j) Continuity of life |
Answers:
1–(c), 2–(d), 3–(a), 4–(b), 5–(e), 6–(f), 7–(g), 8–(h), 9–(i), 10–(j)
E. Very Short Answer Questions
1. What is a living organism?
Answer: A living organism is one that shows characteristics such as growth, respiration, nutrition, excretion, response to stimuli and reproduction.
2. What is a stimulus?
Answer: A stimulus is a change in the surroundings that causes a response in a living organism.
3. What is respiration?
Answer: Respiration is a life process in which living organisms obtain energy from food.
4. What is excretion?
Answer: Excretion is the removal of waste substances from the body.
5. What is germination?
Answer: Germination is the process by which a seed begins to grow into a seedling.
6. Name two conditions needed for seed germination.
Answer: Suitable amount of water and air.
7. What is a pupa?
Answer: A pupa is a stage in the life cycle of a mosquito between the larva and adult stages.
8. What is a froglet?
Answer: A froglet is a young frog that develops from a tadpole before becoming an adult frog.
9. What is the life cycle of a mosquito?
Answer: Egg → Larva → Pupa → Adult.
10. What is the life cycle of a frog?
Answer: Egg/spawn → Embryo → Tadpole → Froglet → Adult.
F. Short Answer Questions
1. Why is movement alone not enough to identify a living organism?
Answer: Movement alone cannot identify a living organism because non-living things such as cars can also move. Plants may not move from one place to another, but they show movements such as opening of flowers and growth of shoots.
2. How do plants respond to stimuli?
Answer: Plants respond to changes in their surroundings. For example, the leaves of the touch-me-not plant fold when touched. Shoots may also grow towards light.
3. What conditions are required for seed germination?
Answer: Seeds generally require a suitable amount of water and air for germination. Different seeds may also require suitable light or dark conditions.
4. Why is air required for seed germination?
Answer: Air is present in the spaces between soil particles. The developing embryo needs air for respiration during germination.
5. Why should grains and pulses be kept dry during storage?
Answer: Seeds require water for germination. Keeping grains and pulses dry prevents them from absorbing moisture and germinating, helping in proper storage.
6. How does the life cycle of a mosquito differ from that of a frog?
Answer: A mosquito passes through four main stages: egg, larva, pupa and adult. A frog passes through egg/spawn, embryo, tadpole, froglet and adult. A mosquito has a pupa stage, whereas a frog does not.
7. Why does a tadpole have a tail?
Answer: The tadpole lives mainly in water, and its tail helps it to swim and move through water. As it develops into a frog, the tail gradually disappears.
8. What did Jagadish Chandra Bose show about plants?
Answer: Jagadish Chandra Bose used an instrument called a crescograph to study plant responses. His work showed that plants respond to stimuli.
G. Long Answer Questions – 7
Q1. Explain the main characteristics of living organisms.
Answer:
Living organisms show several important characteristics:
Nutrition: They need food or nutrients for growth and development.
Growth: Living organisms grow and develop.
Respiration: They respire to obtain energy from food.
Excretion: They remove waste substances from their bodies.
Response to stimuli: They respond to changes in their surroundings.
Reproduction: They produce new individuals of their own kind.
Movement: Living organisms show different types of movement.
Death: All living organisms eventually die.
These characteristics together help us identify living organisms.
Q2. Explain the process of seed germination and the conditions required for it.
Answer:
Germination is the process by which a seed begins to grow into a seedling.
The important conditions are:
Water: It softens the seed coat and helps the embryo develop.
Air: Air is available in the spaces between soil particles and is needed for respiration.
Suitable light or darkness: Different seeds may have different requirements. For example, bean seeds generally do not require light for germination.
When suitable conditions are available, the embryo develops and the seed grows into a young plant.
Q3. Describe the growth and movement of roots and shoots in plants.
Answer:
Roots and shoots show definite patterns of growth.
The root generally grows downward into the soil.
The shoot generally grows upward.
If a seedling is placed upside down, its root bends and grows downward, while the shoot bends and grows upward.
When light comes from one direction, the shoot grows towards the light.
The root continues to grow downward.
These observations show that plants respond to environmental conditions and stimuli.
Q4. Describe the life cycle of a plant.
Answer:
The life cycle of a plant can be described as:
Seed → Germination → Seedling/Young plant → Mature plant → Flowers → Fruits/Pods containing seeds → New generation
First, a seed germinates under suitable conditions. It develops into a seedling and then a young plant. The plant grows into a mature plant and produces flowers. Flowers develop into fruits or pods containing seeds. These seeds can germinate and produce new plants.
Thus, the life cycle continues from one generation to another.
Q5. Explain the life cycle of a mosquito.
Answer:
The mosquito passes through four main stages:
Egg → Larva → Pupa → Adult
Egg: The adult female mosquito lays eggs on or near water.
Larva: The eggs hatch into larvae. They live in water and come to the surface for air.
Pupa: The larva changes into a pupa.
Adult: The adult mosquito emerges from the pupa.
The adult mosquito can reproduce and begin the life cycle again.
Q6. Describe the life cycle of a frog.
Answer:
The life cycle of a frog includes several stages:
Spawn/Eggs → Embryo → Tadpole → Tadpole with legs → Froglet → Adult frog
A frog lays eggs in water in a jelly-like cluster called spawn.
The eggs develop into embryos.
They hatch into tadpoles, which have tails and live in water.
Tadpoles develop hind legs and later other legs.
The tadpole develops into a froglet.
The froglet gradually loses its tail and becomes an adult frog.
The adult frog can reproduce and continue the life cycle.
Q7. Compare the life cycles of a mosquito and a frog.
Answer:
Both mosquitoes and frogs begin their life cycles from eggs and undergo several stages before becoming adults. Their young stages are different from their adult forms, and their bodies change significantly during development.
Mosquito:
Egg → Larva → Pupa → Adult
Frog:
Egg/Spawn → Embryo → Tadpole → Froglet → Adult
Main differences:
A mosquito has a distinct pupa stage, while a frog does not.
The mosquito has a larval stage, whereas the frog has a tadpole stage.
A tadpole has a tail that helps it swim.
A froglet develops into an adult frog after further changes.
Both life cycles demonstrate growth, development and changes in body form.
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