Question # 1

Ronald Ross experimented on ____________ and ____________mosquitoes.

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Culex

Anopheles

Both

None

A scientific law is an irrefutable:

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Observation

Theory

Principle

None of these

When we work hard we suffer from muscle fatigue because muscle cells:

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Carry out aerobic respiration at faster rate and so are tired

Carry out anaerobic respiration and so-accumulate more CO₂

Carry out anaerobic respiration and so accumulate lactic acid

Carry out aerobic respiration at faster rate and so burst

The_______is the membrane enclosed structure in eukaryotic cells that contains the DNA of the cell.

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Mitochondria

Chloroplast

Nucleolus

Nucleus

Famous book of Jabir -Bin -Hayan is.

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Al-Kheil

A- Washoosh

Al-Nabata

Al- Abil

The number of bioelemets in nature is.

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13

14

15

16

The process of mitaosis ensures that:

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Each new cell is genetically different form its parent

Each new cell receives the proper number of chromosomes

Cells which divide at the appropriate tme

Chromosomes replicate without errors

How many percent of the light falling on the leaf surface is absorbed:

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5%

6%

7%

1%

Which of these cellular organelles have their own DNA?

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Chloroplast

Nucleus

Mitochondria

All of these

A testable statement is (a/an)

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Observation

Hypothesis

Theory

Law

Closely related genera are grouped into ____________

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Family

Species

Order

Phyla

............... are present only in plant cells.

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Plastids

Nucleus

Nucleolus

Ribsomes

the division of cytoplasm is called ............. .

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Karyokinesis

Cytokinesis

Anaohase

Telophase

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