Plants with weak stems such as cucumber and bittergourd show………
A) Phototropism
B) Thigmotropism
C) Geotropism
D) Chemotropism
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Two triangles ABC and PQR are such that `AB=3 cm, AC=6 cm, angle A=70^(@), PR=9 cm, angle P=70^(@) and PQ=4.5 cm`. Show that `Delta ABC~Delta PQR` and
Correct Answer - SAS-similarity
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Fill in the blanks : (i) Oxylophytes are the plants growing on`…………` and chasmophytes are the plants growing in ……….
Correct Answer - Acidic soil , rock crevices
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Stems of some plants are sticky to touch. Reason ………
Stems of some plants are sticky to touch. Reason Aphids
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1. What are sub aerial stems?
1. Subaerial stems: a. These are generally weak or straggling stems growing over the ground and need support for perpetuation. b. Sometimes these stems are found to grow beneath the soil surface...
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What are metamorphosed stems?
Stem or its vegetative part develops various modifications to carry out specialized functions. Such modified stems are called as metamorphosed stems.
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A farmer arranged support for cucumber plants. So that they creep and grow in normal conditions.
(D) Thigmotropism
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Read the paragraph given below and answer. Most of the plants are flowering plants. Their characters are quite remarkable.
(B) Unisexual flowers
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Vidhya and Vijay were studying the effect of certain radiations on flower plants. Vidhya exposed her plants to UV rays and Vijay exposed his plants
Frequency of UV rays is greater than infrared rays, hence UV rays are much more energetic than infrared rays. Plants cannot tolerate the exposure of high energy rays. As a...
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Weak deer cannot live long in a forest according to Darwin’s principle. What concept does it show ?
D) Survival of the fittest
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The stems that stores the food materials are known as ………………… Stems.
The stems that stores the food materials are known as Tuberous Stems.
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