Biology
The figures given alongside represent the different kinds of leaf arrangements on the stem. Study the figures and answer the following :
(i) a technical term for the arrangement of leaves on the stem.
(ii) Name the three kinds of arrangements shown in the figure A, B and C respectively.
(iii) Give one example of each kind of arrangement.
Leaf
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Answer
(i) Phyllotaxy.
(ii)
Figure A shows Alternate phyllotaxy.
Figure B shows Opposite phyllotaxy.
Figure C shows Whorled phyllotaxy.
(iii)
An example of Alternate phyllotaxy — Mint
An example of Opposite phyllotaxy — Jasmine
An example of Whorled phyllotaxy — Oleander (Nerium)
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Related Questions
Draw a neat diagram of a simple, petiolate leaf showing reticulate venation and label its seven important parts. Answer the following questions:
(i) Write one important function of axillary buds.
(ii) What are the two main function of leaves ?
(iii) Name two plants which have leaves with serrated margins.
(iv) Why do some plants have tendrils (modified leaflets) ?
(v) Name a plant in which the leaves are modified into spines.
The figures given below show three insectivorous plants. Study the same and answer the following questions :
A
B
C
(i) Name the plants shown as A, B and C.
(ii) For which specific nutritional element do these plants trap insects ?
(iii) In which Indian state is plant A found abundantly ?
(iv) Which part of the leaf is modified into a pitcher in plant A ?
(v) Write one specific feature of the soil in which these plants usually grow.
Draw neat diagrams of the following and give an example of each :
(i) A simple leaf.
(ii) A compound leaf with incision upto midrib.
(iii) A compound leaf with incision upto petiole.
(iv) A simple leaf with reticulate venation.
(v) A simple leaf with parallel venation.
Complete the crossword using the clues given below. Check your performance with the correct solutions given at the end of the chapter.
Clues across :
- Plant that bears buds in leaves for propagation.
- The flattened green part of leaf.
- Underground plant part.
- Structure that develops into flower.
Clues down :
- The central big vein of a leaf.
- A modification seen in cactus.