Correct Answer: D. sunlight

Correct Answer: B) constrict to reduce the amount of blood flowing to the skin

Explanation

When our bodies get cold, they need to regulate our internal temperature to keep us warm. One of the ways our body does this is by controlling the amount of blood that flows to our skin. The skin is the outer layer of our body and is in direct contact with the environment, so it's important that our body keeps it at the right temperature. The question is asking what happens to the blood vessels in our skin when we get cold. Option A says that the blood vessels dilate, which means they get wider to increase blood flow to the skin. However, this is not correct. Option B says that the blood vessels constrict, which means they get narrower to reduce the amount of blood flowing to the skin. This is the correct answer because if less blood flows to the skin, less heat is lost from the body. Option C says that the blood vessels dilate to reduce the amount of blood flowing to the skin, which is incorrect because dilating the blood vessels would actually increase blood flow. Option D says that the blood vessels constrict to increase the amount of blood flowing to the skin, which is also incorrect because constriction reduces blood flow. In summary, when it is cold, the blood vessels of the skin constrict to reduce the amount of blood flowing to the skin, helping to keep our bodies warm.

Correct Answer: B) 50%

Explanation

This Biology question is asking about the percentage of sons that are expected to inherit haemophilia, a genetic disorder that affects blood clotting, when a male with normal blood clotting ability mates with a female carrier of the haemophilia gene. The correct answer is Option B: 50%. This is because haemophilia is an X-linked recessive disorder, which means the gene for haemophilia is carried on the X chromosome. Males have one X and one Y chromosome, while females have two X chromosomes. If a female is a carrier of the haemophilia gene on one of her X chromosomes, she has a 50% chance of passing that X chromosome on to her son. If her son inherits the haemophilia gene, he will suffer from the disease because he does not have a second X chromosome to provide a healthy copy of the gene. It's important to note that females can also inherit haemophilia if they inherit the haemophilia gene on both of their X chromosomes. However, this is much less common than in males because females have a second X chromosome that can provide a healthy copy of the gene. In summary, when a normal male mates with a female carrier of haemophilia, there is a 50% chance that their son will inherit the haemophilia gene and suffer from the disease. Daughters have a 50% chance of inheriting the gene and becoming carriers themselves, but are unlikely to suffer from the disease unless they inherit the gene on both X chromosomes.

Correct Answer: B) cocoa

Explanation

The cocoa swollen shoot virus disease (CSSVD) caused by the Cacao swollen shoot virus (CSSV) is one of the major disease problems affecting cocoa production in West Africa, most especially, Ghana, Cote D'Ivoire, Nigeria and Togo .

Correct Answer: D. remain steady

Correct Answer: A. a high demand for food and energy

Correct Answer: B. dendrons

Correct Answer: A. it passes twice through the heart in a complete circuit

Correct Answer: D. courting a female

Correct Answer: B. Plasmodium