Answer:
Calcium ions are necessary to activate the binding sites on the actin filaments. The molecule ATP is required each time the myosin head detaches from one site and reattaches to another.
The right answer is Transpiration.
In plants, plant transpiration is the continuous process caused by the evaporation of water from the leaves (and the corresponding recovery from the roots in the soil).
For large plants and helophytes, it can be very important. On average, a plant loses the equivalent of its weight in water per day. This explains the role played by large plant formations, including forests on the water cycle and climate.
Answer:
A, B AND E
Sepals, petals, stamens and carpel
Explanation:
These floral structures which are attached to the receptacle in whorls include the following:
- Sepals which protect the inner parts of the flower especially in the early stages of development.
- petals are brightly coloured, large and conspicuous especially in insect-pollinated flowers. If petals are fused, the corolla is said to be gamopetalous.
- Stamens constitute the androecium, which is the male part of the flower. Stamens are made up of filaments and anthers which produce pollen grains.
- Carpel form the pistil or gynoecium which is the female part of the flower. A carpel is made up of stigma, style and ovary.
Answer:
The nervous system is present only in animals.
The nervous system also interacts with other systems.
It also controls body functions(the central nervous system does).
Because they receive vitamin D giving them nutrients and energy.