Some desert plants have very small leaves whereas some others have only spines. How does this benefit the plants?
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Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side.
Light is a limiting factor for photosynthesis. Leaves get lesser light for photosynthesis when they are in shade. Therefore, the leaves or plants in shade perform lesser photosynthesis as compared...
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Why does moon have very cold and very hot temperature variations even though it is at the same distance from the sun as the earth is?
There is absence of atmosphere on the moon,so no part of heat remains trapped in its atmosphere. That is why in day time moon gets hot and in night it cools...
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It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
Green leaves have a lot of moisture in them. This moisture does not allow them to catch fire easily. However, dry leaves have no moisture in them. Therefore, they catch...
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Write a short note on (a) Adaptations of desert plants and animals (b) Adaptations of plants to water scarcity (c) Behavioural adaptations in animals
(a) Adaptations of desert plants and animals Adaptations of desert plants Plants found in deserts are well adapted to cope with harsh desert conditions such as water scarcity and scorching heat. Plants...
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Why does NH3 forms intermolecular hydrogen bonds whereas PH3 does not ?
[Hint : Due to strong electronegativity, small size of nitrogen atom and presence of lone pair of electrons on N atom.]
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In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes.
a. males and females, respectively
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Open stunted forests with bushes and small trees having long roots and sharp thorns or sharp thorns or spines are commonly found in :
(d) Open stunted forests with bushes and small trees having long roots and sharp thorns or spines are commonly found in the area where the rainfall is less than 80...
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Explain with an example that strong acids have very weak conjugate bases and a strong base have a very weak conjugate acid.
HCl + HOH --------> Cl- + H3O+ CH3COOH + HOH --------> CH3COO- + H3O+ HCl is strong acid but chloride ion is a weak base similarly CH3COOH is weak acid but CH3COO-...
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There are 50 students admitted to a nursery class. Some students can speak only English and some can speak only Hindi.
(d) Number of students who speak only English = (Number of students who speak English – Number of students who speak both Hindi and English) = 21 – 10 = 11 Number...
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Write four adaptations observed in the leaves of desert plants
Leaves are reduced or absent Pinnatly compound Sunken stomata Presence of hairs on leaves called trichophylly Leaves and stipules modified into throns.
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