Answer:
D) Negative Geotropism
Explanation:
The stem growing upright is a typical example of negative geotropism.
Geotropism is the growth of a part of plant towards the pull of gravity.
- Gravity always pulls down on every object.
- When a body grows downward, then it is responding to a positive geotropism.
- When a body begins to grow upward, again gravity, then it is negative geotropism.
In this case, the negative geotropism is exhibited by some plant roots.
Also, some tree branches can also grow downward and this shows positive geotropism
Answer:
1. Wind bounces and rolls sand along the ground, a process called saltation.
2. Sediment carried by the wind will drop to the ground when the wind's velocity decreases.
3. The force of the wind pushes particles up the windward slope of the dune as it moves.
4. The force of gravity allows particles to slide down the leeward slope of a dune as it moves.
Explanation:
Saltation is the process which involves the movement of the particles by the force of wind or water. The wind or the water removes the particles and carry them forward. Materials like pebbles and stones get carried away by the flow of water. The large particles get settled in the river bed.
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