there is no clear evidence about plants evolving in the desert, or fossils of any kind of cactus despite their distribution over a large area. But, scientists are of the opinion that they acquired specific attributes millions of years ago, as a response to the vastly changing climate and conditions.
-Desert plant root system
A typical desert plant has a deep root system, which is a specific physical mechanism. As the roots grow deep down the soil, they absorb soil water, which is then transported to the upper portions of the plant.
-Desert plant leaves
Bear small foliage with waxy surface to minimize transpiration (loss of water through stomatal pores), which in turn, helps to conserve water.
Answer:
Motion is a change in position measured by distance and time. Speed tells us the rate at which an object moves.
Answer:B
Explanation:
The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
Answer and Explanation:
The sensory information encoded for by the hair cells in the maculae of the saccule and utricule are:
- the direction and strength of mechanical stimuli (polarity information)
- Response to the head's rotational movement
Functions of the otoliths
The otoliths provide balance, movements and serve as directional indicators in vertebrates. They help higher vertebrates in sound detection.
Functions of the vestibular nuclei
- Maintenance of equilibrium and posture
- Modification of muscle tone
- Relays information to the cerebral cortex
- Directing the movements of the head and eye
- Maintaining the line of vision
