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Biology class 8 > Cell-Structure and Functions > Flashcards

Cell-Structure and Functions Flashcards

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1
Q

Who discovered cells

A

Robert Hooke

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2
Q

When were cells discovered

A

1665

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3
Q

Who put forward the cell theory of life

A

Mathias Schleiden and Theodor Schwann

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4
Q

When was the cell theory of life put forward

A

1838

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5
Q

Name some unicellular organisms

A

Amoeba, Paramecium, Euglena

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6
Q

How many cells in the human body

A

100 trillion

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7
Q

size of ostrich egg

A

170 mm * 130 mm

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8
Q

smallest cell of the world

A

bacterial cell

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9
Q

bacterial cell size

A

0.0001 mm * 0.0005 mm

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10
Q

Diameter of RBC

A

0.007 mm

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11
Q

Diameter of Average cell

A

0.02 mm

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12
Q

Name origin of cytoplasm

A

kytos means hollow and plasma means liquid

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13
Q

Other name of cell membrane

A

Plasma Membrane

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14
Q

plant cells have have a _____ that animal cells don’t have

A

cell wall

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15
Q

Present in the cytoplasm are small structures known as ______

A

organelles

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16
Q

____ part of the cell can be compared to the brain in anmials

A

nucleus

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17
Q

the liquid in the nucleus is called _____

A

nucleoplasm

18
Q

chromosomes carry ____

A

genes

19
Q

nucleus and cytoplasm together form the ____

A

protoplasm

20
Q

structure of mitochondria

A

rod-like

21
Q

role of mitochondria

A

oxidizing food for energy

22
Q

nickname of mitochondria

A

powerhouse of the cell

23
Q

____ are sac-like structures in the cell

A

vacuoles

24
Q

do animals have larger vacuoles than plants

A

no

25
Q

Plant cells have organelles known as _____ present in the cytoplasm

A

plastid

26
Q

Green colored plastids are known as _____

A

chloroplasts

27
Q

role of endoplasmic reticulum

A

help transport substances within the cell

28
Q

role of ribosomes

A

make protiens

29
Q

role of lysosomes

A

destroy old cell structures

30
Q

role of centrosomes

A

regulate cell division

31
Q

projections in paramecium are known as ____

A

cilia

32
Q

projections in euglena

A

flagella

33
Q

how many chromosomes in the normal human cell?

A

23

34
Q

what are eukarayotes

A

well developed cells

35
Q

word origin of eukaryotes

A

eu = true, karyon = nucleus

36
Q

prokaryotes word origin

A

pro = primitive, karyon = nucleus

37
Q

Electron microscope magnification

A

50,000 times

38
Q

the first commercial electron microscopes were sold in the _____

A

1930s

39
Q

new cells formed by cell division are known as _____

A

daughter cells

40
Q

which cells cannot divide

A

nerve cells

Biology class 8 (2 decks)

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