Answer:
D) Can simple organic molecules form spontaneously in an oxygen-free atmosphere?
Explanation:
Answer:
(I) Earthworms digestive track is straight and simple. cockroach is curved and more developed. (ii) Earthworm absorb oxygen passively through the moist skin while the cockroach takes gas diffusion place through their spircle .
Answer:
The air
Explanation:
the air has a component of 79% of nitrogen gas (N2)
Answer:
Option-B
Explanation:
Phototropism refers to the movement of plants in response to light. The mechanism of phototropism involves the photoreceptors which respond to a different wavelength of light: the phytochromes to red light, cryptochromes to blue light and the phototropin to the UV light.
Plants integrate the signals obtained from these receptors and then activates the gene which will be involved in the phototropism.
The gene could be the production of the auxin hormone and the PIN proteins which helps in the distribution of the auxin in the plants. Due to the production of this hormone and its distribution in the shoot, the grass tips bend towards the light.
Thus, Option-A is correct.
The post-marketing surveillance phase of drug development includes surveys and reports of adverse reactions as well as consumer watchdog information.
