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WorksheetsClass 8_Biology_Chemistry
Total questions: 35
Worksheet time: 28mins
The property, which allows the metals to be hammered into thin sheets, is called
(a)
The one that has lustre is
Chlorine
Sulphur
Copper
Phosphorus
The following that forms basic oxide is
Silicon
Sulphur
Phosphorus
Calcium
The non metal which is a brittle solid is
bromine
phosphorus
sulphur
hydrogen
The non-reactive metal towards oxygen is
iron
gold
lead
zinc
A non-metal used in making fertilisers is
Chlorine
iodine
oxygen
nitrogen
When an iron nail is dropped into a copper sulphate solution, then
it remains unchanged
the copper replaces the iron
the iron replaces the copper
the solution becomes colourless
The liberation of hydrogen from the acid by the metal is known as
replacement reaction
addition reaction
displacement reaction
slow reaction
Sodium is stored in
ice
water
kerosene oil
coconut oil
The density of the metals is very high because they
are found in solid state
have closely packed atoms
are malleable
are ductile
The spheroidal structure present in the nucleus is called
protoplasm
nucleoplasm
cytoplasm
nucleolus
The thread like structures present in the nucleus are known as
nucleoplasm
nucleolus
chromosome
nuclear membrane
A experiment was conducted in which the labelled organelles 'A' and 'B' of the plant cell are removed. What will be the effect of removal of these two organelles on the function of plant cell?
The plant cell will lose its turgidity and it will not able to perform protein synthesis.
The plant cell will lose its turgidity and it will not able to perform photosynthesis.
The plant cell will lose its turgidity and it will not able to perform detoxification.
The plant cell will lose its turgidity and it will not able to transport substances.
The cells with well-organised nucleus are called
eukaryotic cells.
mature cells.
prokaryotic cells.
premature cells.
Euglena is a unicellular organism possessing
cilia
flagella
psudopodia
bristles
Yellow yolk of egg represents
single cell.
half cell.
zygote.
unfertilised egg.
The largest vacuoles can be found in
amoeba
plants
plants and animals
bacteria
Select the false statement from the given
The outermost layer in plant cells is cell wall.
Activities of the cell is controlled by nucleus.
90% by weight, protoplasm is made up of compounds of elements carbon, oxygen, nitrogen and hydrogen.
Plastids are found in both animal as well as plant cells.
The structure responsible for the transfer of characters from the parents to next generation is
chromosome
lysosome
plastids
mitochondria
Name the green plastids present in cell.
(a)
The cell formed by fertilisation is called
sperm
ova
zygote
gamete
The female reproductive organs are a pair of
eggs.
ova.
oviducts.
ovaries.
The mobility of of sperms of 'A' is very low. Which part of the sperm is affected in this condition?
Head
Tail
Neck
Nucleus
An example of the animal in which internal fertilisation occurs is a
frog.
fish.
cow.
earthworm.
Some women are unable to get pregnant because their oviducts are
absent.
blocked.
curved.
small.
The fertilisation in which fusion of gametes takes place outside the body is called
simple ferilisation.
double fertilisation.
internal fertilisation.
external fertilisation.
The stage of embryo in which all body parts are identified is termed as
zygote.
foetus.
oviduct.
uterus.
The type of asexual reproduction found in Amoeba is known as
budding.
binary fission.
multiple fission.
spore formation.
The three-phase life cycle of an insect is called
metamorphosis.
complete metamorphosis.
incomplete metamorphosis.
no metamorphosis.
Full form of IVF is
Intra Vitarine Fluid
In Vitro Fluid
In Vivo Fertilisation
In Vitro Fertilisation
Jenifer visited the doctor as she is facing problem in conceiving. On examination, doctor found that tube 'X' is blocked in Jenifer’s reproductive system. Due to this condition, she might face difficulty in
ovulation, implantation and fertilisation.
ovulation and fertilisation.
fertilisation and implantation..
only fertilisation.
A correct statement regarding reproduction is that
ovaries produce female gametes
ovaries produce male gametes
female gametes are called sperms
male gametes are called ova
External fertilisation is common in
terrestrial animals.
aerial animals.
aquatic animals.
arboreal animals.
A scientist studied the reproduction in frog in a pond. A female frog laid 2500 eggs in a pond. After few weeks, only 370 tadpoles were found moving in the pond water. Later, these tadpoles developed into frogs. What could be the possible reason behind such a low survival rate?
Tadpoles move to land for respiration.
Eggs and developing offspring could not survive in acidic condition of water.
Eggs and developing offspring are prone to predators and environmental changes.
Developing offspring could not survive in water due to high temperature.
The type of reproduction in which a single parent is involved is called
multiplication.
Asexual reproduction.
Sexual reproduction.
Fertilisation.
