Identify in order, the plants showing alternate, opposite and whorled phyllotaxy
- China Rose, Colotropis, Nerium
- China Rose, Nerium, Calotropis
- Nerium, China Rose, Calotropis
- Nerium, Calotropis, China Rose
The Correct Option is A
Solution and Explanation
Alternate: In this, each node gives rise to signal leaf and these are arranged alternately giving a spiral form (e.g., mango, china rose etc).
Opposite: In this, each node gives rise to two leaves arranged opposite to each other.
It can be opposite superposed (e.g., lxora) or opposite decussate (e.g., Ocimum, Calotropis prosera)
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- Which of the following examples show monocarpellary, unilocular ovary with many ovules?
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- Given below are two statements: One labelled as Assertion A and the other labelled as Reason R:
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Reason R: Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.
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Axile placentation is observed in
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Concepts Used:
Morphology of Flowering Plants
Morphology in flowering plants tells us that every plant has two systems such as a root system and a shoot system. The root system digs deep into the ground and structures a system of its own. On the other hand, the shoot system is the one that is above ground level and includes various plant parts.
Root System
The descending part of the plant grows under the soil roots. During the germination process, the radicle from the seed grows earthward and branches out. The branches along with the primary root are called the root system. Roots lack chlorophyll and therefore they are not green in color. Roots are positively geotropic and hydrotropic, that is, they grow downwards ground and water, and negatively phototropic, which is growing away from light.
There are three types of root systems found in plants are as follows:
- TapRoot System
- Fibrous Root System
- Adventitious Root System
Shoot System
The stem is also an essential element of the plant. It is the ascending portion of the plant axis that bears branches, flowers, leaves, and fruits, as well as aiding in water and mineral conduction. It is the plant's aerial portion, brought about from an embryo's plumule or germinating seeds. Young stems are ordinarily green, but they finally turn woody and brown.