Question # 1

In plants, _______________ conduct food.

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Xylem

Phloem

Both

None

Down's sayndrome is an autosomal non-disjunction of chromosomes number ............. .

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22

12

21

14

Rough endoplasmic reticulum is the area in a cell where _________ are synthesized.

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Polysacchrides

Proteins

Lipids

DNA

The cells which can divide in plants are:

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Sclerenchyma cells

Collenchyma cells

Parenchyma cells

Meristematic cells

Transmission electron microscope gives ............ images.

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1D

2D

3D

All

The concentration of carbon dioxide in the environment is:

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0.3%

0.03%

3%

3.01%

Which one of the following is specific in action ?

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Catalyst

Enzyme

Both

None

The phase which can exist for life is:

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G₀

G₁

G₂

S phase

The career related with gardening is

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Medicine

Horticulture

Forest

Farming

A hypothesis must be testable to be scientifically valid. Being testable means that:

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Some observations could prove that hypothesis is incorect

Only a controlled experiment can indicate whether the hypothesis is correct or incorrect

The hypothesis is proven wrong

The opposite of hypothesis is tested and proven worng

In which component of the leaf cells, chlorophill is present?

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Stroma

Thylakoids

Plasma membrane

Cytoplasm

Which of the following is a type of leukocyte?

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Macrophage

Eosinophil

Monocyte

All of the above

_______________ are present in mitochondria .

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Cristae

Cistae

Cristernae

All

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