I. Many xerophytic plants have thick cuticle on leaf epidermis and sunken stomata II. Some xerophyti

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11.Organisms and Populations

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$I.$ Many xerophytic plants have thick cuticle on leaf epidermis and sunken stomata

$II.$ Some xerophytic plants have special photosynthetic pathway $(CAM)$ that enables their stomata close during day

$III.$ Opuntia has spines (modified leaves), photosynthetic phylloclade (stem)

$IV.$ All adaptations are genetically fixed in all organisms

Choose the combinations of correct option

$I, II, III$ and $IV$

$II$ and $III$

$II$ and $I$

$I, II$ and $III$

Solution

All adaptations are not genetically fixed, like behavioural adaptation. Hibernation and aestivation adaptations for avoiding extreme temperature also not genetically fixed

Standard 12

Biology

Which of the following gas is most harmful for plants

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Organisms occupying similar ecological niche but different geographical areas of distribution are called as

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Find out the population density when $N$ is $1000$ and $S$ is $100\, m ^{2}$

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Niche overlap indicates

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(AIPMT-2006)

Warm blooded animals like mammals from colder climates generally have shorter ear and limbs. This is an explanation of

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Solution

Similar Questions

Which of the following gas is most harmful for plants

Organisms occupying similar ecological niche but different geographical areas of distribution are called as

Find out the population density when $N$ is $1000$ and $S$ is $100\, m ^{2}$

Niche overlap indicates

Warm blooded animals like mammals from colder climates generally have shorter ear and limbs. This is an explanation of

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