Answer:
Option A, Hormones are controlled by a feedback loop; information about a system is sent back to the controller of the system to improve its function.
Explanation:
Negative feedback loop controls the hormone production and release. This is done by eliciting the release of substances till a certain level after which the stop signal is activated thereby preventing further release. By this method, concentration of hormones in blood is maintained within the narrow range.
For example – Thyroid hormones is released when the anterior pituitary signals the thyroid. This continues till the hormones in the blood reach the threshold level. Once the threshold level is reached, hypothalamus receives a feedback and then signals anterior pituitary to inhibit further signaling to the thyroid
Hence, option A is correct
Answer:
The bright color of butterflies is a discouraging factor for its prey
Explanation:
Butterflies and caterpillars are easily visible to its prey but still they do not eat any of them. This can be because of two factors –
a) The bright color of these organisms might be a factor that makes them uninteresting (intending to be tasteless etc.) for their prey
b) The bright color might be a signal to the bird indicating in advance of any harm associated with the butterflies/caterpillar feeding.
Hence , instead the Monarch butterflies have brightly colored orange wings with black patterns on them, making them easily visible to birds, the birds rarely eat the monarchs
Answers;
-The P generation has yellow and green seeds.
-The F1 generation has all yellow seeds.
-The F2 generation has yellow and green seeds.
Explanation;
Yellow seed color (dominant)
Green seed color (recessive)
P generation: In Mendel's experiments the parental generation.
Yellow seed color
F1 generation: In Mendel's experiments the offspring of the P generation
Yellow seed color and
Green seed color
F2 generation: In Mendel's experiments the offspring of the F1 generation
not sure but I think it is under skin/nose/Uncertain Behavior
Explanation: we will conclude this by the following characteristics:
1.organims that lack a proper nucleus.
2.they have membrane bounded organelles
3.they are tiny single cell oraganisms which cannot be seen by naked eye.
4.they are the oldest livinh organisms on earth
5.they are present in very harsh conditions like volcanic vents or at the bottom of the sea
