Grade 8: Science : Cells

Grade 8 · Science · 60 questions · Mixed

Cells

Name: ________________________Date: __________________Score: ______ / 60

Question 1mcq

Why do many body changes begin during adolescence?

A.Because endocrine glands start releasing hormones that control growth and development

B.Because the body stops growing in height completely

C.Because the bones become soft and disappear

D.Because digestion no longer needs energy

Question 2long form

Why is budding in Hydra called asexual reproduction? Explain the process.

Question 3long form

How does the embryo of a mammal develop before birth? Write in a few steps.

Question 4true false

A chick develops inside the mother's body.

○True

○False

Question 5true false

A cat is a viviparous animal.

○True

○False

Question 6fill blank

In Hydra, the process in which a small outgrowth grows into a new individual is called .

Answer: ________________________________

Question 7fill blank

The first cell formed after fertilisation is called a .

Answer: ________________________________

Question 8fill blank

The young one of a frog is called a .

Answer: ________________________________

Question 9mcq

Which event happens during frog development?

A.A calf turns into a seed

B.A tadpole grows legs

C.A chick hatches from an egg

D.A bud forms on a cow

Question 10mcq

After fertilisation, the zygote begins to _____.

A.Melt

B.Hatch

C.Bloom

D.Divide

Question 11mcq

Which of these animals gives birth to young ones?

A.Hen

B.Dog

C.Frog

D.Lizard

Question 12mcq

Which pair is correctly matched?

A.Ovum — male cell

B.Zygote — female cell

C.Sperm — male cell

D.Bud — egg cell

Question 13mcq

In asexual reproduction, new animals are formed from _____.

A.Only seeds

B.Two parents only

C.One parent only

D.Only eggs laid in water

Question 14mcq

Which statement about sexual reproduction is correct?

A.It needs only one parent

B.It uses male and female gametes

C.It happens only in Hydra

D.It never forms a zygote

Question 15mcq

Which animal undergoes metamorphosis?

A.Hen

B.Frog

C.Cat

D.Cow

Question 16mcq

The first cell formed after fertilisation is called the _____.

A.Bud

B.Tadpole

C.Embryo

D.Zygote

Question 17mcq

In mammals, the embryo usually develops inside the _____.

A.Shell

B.Water

C.Uterus

D.Nest

Question 18drag drop

Match each term with the correct group.

Question 19drag drop

Arrange the stages of frog development in the correct order.

Question 20drag drop

Sort the animals into oviparous and viviparous groups.

Question 21step based

Explain budding in Hydra in order and say why it is called asexual reproduction.

Question 22step based

Describe the life cycle of a frog in the correct order.

Question 23step based

Explain fertilisation in animals step by step.

Question 24long form

Describe the life cycle of a frog from egg to adult. Mention metamorphosis.

Question 25mcq

A student groups a cow, a frog and a hen. Which statement is correct about their reproduction?

A.Cow reproduces by budding; frog is viviparous; hen is asexually reproducing

B.Cow is viviparous; frog and hen are oviparous

C.Cow and hen give birth to young ones; frog lays seeds

D.Cow is oviparous; frog and hen are viviparous

Question 26mcq

Which observation best shows that Hydra reproduces asexually?

A.The baby develops inside the mother's body

B.Two parents always make one egg together

C.The young one hatches from an egg laid outside the body

D.A small bud grows on one parent and no gametes fuse

Question 27long form

What is fertilisation? Explain why it is important in animals.

Question 28long form

Differentiate between oviparous and viviparous animals. Give one example of each.

Question 29true false

All animals that give birth to young ones are oviparous.

○True

○False

Question 30true false

Fertilisation happens when sperm and ovum fuse.

○True

○False

Question 31true false

In oviparous animals, the embryo develops inside the mother's body.

○True

○False

Question 32true false

Hydra can reproduce by budding.

○True

○False

Question 33fill blank

The fusion of sperm and ovum is called .

Answer: ________________________________

Question 34fill blank

Animals that give birth to young ones are called animals.

Answer: ________________________________

Question 35fill blank

The male reproductive cell is called .

Answer: ________________________________

Question 36mcq

What is the young one of a frog called?

A.Calf

B.Chick

C.Tadpole

D.Pup

Question 37mcq

Which animal is oviparous?

A.Dog

B.Cat

C.Hen

D.Cow

Question 38mcq

Hydra reproduces mainly by which method?

A.Budding

B.Pollination

C.Hatching

D.Metamorphosis

Question 39mcq

What is fertilisation?

A.The growth of a baby animal

B.The fusion of sperm and ovum

C.The laying of eggs

D.The breaking of an egg shell

Question 40mcq

Which animal is viviparous?

A.Frog

B.Hen

C.Butterfly

D.Cow

Question 41mcq

Which is the female reproductive cell in animals?

A.Seed

B.Sperm

C.Ovum

D.Zygote

Question 42mcq

Which is the male reproductive cell in animals?

A.Bud

B.Embryo

C.Ovum

D.Sperm

Question 43mcq

What is reproduction in living things?

A.Moving from place to place

B.Taking in air for breathing

C.Making food for the body

D.Making more young ones

Question 44true false

Boys and girls may both experience growth spurts, body hair growth, and emotional changes during adolescence.

○True

○False

Question 45fill blank

The period between childhood and adulthood is called .

Answer: ________________________________

Question 46mcq

Which gland is often called the master gland because it controls other endocrine glands?

A.Thyroid gland

B.Pancreas

C.Salivary gland

D.Pituitary gland

Question 47mcq

Which change is commonly seen when a child reaches adolescence?

A.A rapid increase in height and body size

B.A complete stop in learning

C.An instant change into adulthood

D.A permanent loss of all baby teeth in one day

Question 48mcq

Which statement best describes the cell membrane?

A.It stores all the hereditary information of the cell

B.It forms the outer boundary and controls what enters and leaves the cell

C.It is a rigid outer covering that makes the cell hard

D.It is found only in animal cells and makes food

Question 49fill blank

In a plant cell, the large central helps store water and maintains shape.

Answer: ________________________________

Question 50mcq

What is the cell considered to be in living organisms?

A.A layer that covers only plants

B.A group of tissues working together

C.A tiny organ inside the body

D.The basic structural and functional unit of living organisms

Question 51long form

A student finds that a school bag feels more comfortable with wide padded straps than with thin straps. Explain this using force and pressure. Also give one more everyday example where increasing the area of contact helps reduce pressure.

Question 52true false

Pressure increases when the same force acts on a smaller area.

○True

○False

Question 53fill blank

For the same force, pressure increases when the area of contact becomes .

Answer: ________________________________

Question 54mcq

Why does a sharp knife cut more easily than a blunt knife?

A.It applies more pressure on a smaller area

B.It has a larger area of contact

C.It removes the need for force

D.It always has more weight

Question 55mcq

Which situation shows that a force can change the direction of motion?

A.A book stays on a table

B.A pencil is kept in a box

C.A cricket bat hits a moving ball and sends it in a new direction

D.A cup is left on a desk

Question 56mcq

What is a force in science?

A.A kind of heat

B.Only a push

C.A push or a pull

D.Only a pull

Question 57true false

All animals lay eggs.

○True

○False

Question 58fill blank

In animals, the fusion of male and female gametes is called .

Answer: ________________________________

Question 59mcq

Which of these animals usually gives birth to young ones?

A.Hen

B.Fish

C.Cow

D.Frog

Question 60mcq

Which statement best describes fertilisation in animals?

A.The growth of a young animal into an adult

B.The joining of the male and female gametes

C.The laying of eggs by an animal

D.The birth of a baby animal