Biology | Study Mode

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Question 1

The streaming movement of cytoplasm observed in a freshly cut leaf of a water plant is termed

amoeboids

centrifugal motion

ciliary motion

cyclosis

osmosis

Explanation

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Correct option: D

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Question 2

Which of the following sequences best illustrates a food chain in an aquatic habitat ?

algae &arr; fungi &arr;toad &arr;snake

diatoms &arr;tadpole &arr;fish &arr;kingfisher

grass &arr;grasshopper &arr;toad &arr;whale

phytoplankton &arr;fish &arr;snake &arr;kingfisher

E. zooplankton &arr;tadpoles &arr;fish &arr;kingfisher

Explanation

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Correct option: B

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Question 3

The process which ensures that the chromosome number for each species of organism remains constant from generation to generation is called

fission

fusion

meiosis

mitosis

oogenesis

Explanation

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Correct option: C

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Question 4

Which of these pairs best illustrates symbiotic association?

dodder on green plants

ferns growing on palm trees

lice on hair of mammals

sea anemone attached to hermit crab

tick found on body of cow

Explanation

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Correct option: D

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Question 5

Which statement about decomposers is NOT true?

They are saprophytes

They carry on intra-cellular digestion

They facilitate the cleansing of the environment

They facilitate the recycling of nutrients

They form a link between autotrophs and heterotrophs

Explanation

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Correct option: B

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Question 6

Root pressure and the transpiration pull are biophysical processes which account for the?

ascent of water into leaves

exchange of gases at leaf surfaces

movement of manufactured food from leaves to storage tissues

opening and closing of stomata

Release of energy from glucose molecules

Explanation

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Correct option: A

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Question 7

An organism existing at the colonial level of life is

chlamydomonas

euglena

paramecium

spirogyra

volvox

Explanation

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Correct option: E

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Question 8

A common characteristic of ALL living things is

gametogenesis

hibernation

photosynthesis

phototropism

respiration

Explanation

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Correct option: E

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Question 9

When a student suddenly runs into a snake on a pathway, which of these chemical messengers are released ?

adrenaline

insulin

oestrogen

testosterone

thyroxine

Explanation

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Correct option: A

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Question 10

Which of the following agricultural activities has the least harmful effect on the environment ?

application of fertilizers

practicing crop rotation

practicing monocropping

spraying herbicides

spraying pesticides

Explanation

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Correct option: B

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