Correct Answer: D) Insect

Explanation

The question is asking about which animal has an open circulatory system. An open circulatory system is a type of circulatory system where the blood does not flow in a closed circuit of blood vessels, but instead flows freely within the body cavity. The options given are Lizard, Toad, Fish, Insect, and Chicken. Out of all these options, the correct answer is Insect. Insects have an open circulatory system where the blood, called hemolymph, flows freely in the body cavity. This hemolymph is pumped by the heart into the body cavity where it bathes the organs and tissues. The hemolymph then returns to the heart to be pumped again. Other animals, including Toads, Fish, Lizards, and Chickens, have closed circulatory systems where the blood flows within blood vessels. In these animals, the blood is pumped by the heart through arteries, capillaries, and veins, which allows the blood to reach all parts of the body. Understanding the different types of circulatory systems is important in Biology. Closed circulatory systems are generally more efficient at delivering oxygen and nutrients to the body's cells, while open circulatory systems are simpler and less energy-intensive. To learn more about this, please read the relevant sections of the recommended textbooks.

Correct Answer: D) hepatic portal vein

Explanation

The question is asking about the blood vessel responsible for carrying digested food from the small intestine to the liver. The options are renal vein, renal artery, hepatic artery, and hepatic portal vein. The correct answer is hepatic portal vein. The hepatic portal vein is responsible for collecting nutrient-rich blood from the small intestine and carrying it to the liver for processing. The liver then filters the blood and removes toxins and excess nutrients before releasing the blood back into circulation. The renal vein and renal artery are not involved in the transportation of digested food from the small intestine to the liver. The renal vein carries blood from the kidneys to the heart, while the renal artery carries blood to the kidneys from the heart. The hepatic artery carries oxygen-rich blood to the liver, but it is not responsible for carrying digested food from the small intestine to the liver. In summary, the blood vessel that carries digested food from the small intestine to the liver is the hepatic portal vein.

Correct Answer: D) Rats

Explanation

The question is asking which animal has a heart with four chambers. The options are Fishes, Insects, Snails, Rats and Worms. To answer the question, we need to know what a heart is and what the chambers of the heart are. The heart is an organ that pumps blood throughout the body. It is responsible for delivering oxygen and nutrients to the cells and removing waste products. The heart is made up of four chambers - the right atrium, the right ventricle, the left atrium, and the left ventricle. Now, back to the question. Which animal has a heart with four chambers? The answer is D, Rats. Rats, like humans and other mammals, have a heart with four chambers. This is because they are warm-blooded animals and require a more efficient circulatory system to maintain their body temperature. In contrast, fish have a two-chambered heart, insects have an open circulatory system and do not have a true heart with chambers, snails have a three-chambered heart, and worms have a simple tubular heart. To summarize, the animal that has a heart with four chambers is a Rat. This is because rats, like humans and other mammals, are warm-blooded and require a more efficient circulatory system. Fish, insects, snails, and worms have different types of circulatory systems and hearts with fewer chambers.

Correct Answer: C) Endoplasmic reticulum

Explanation

The question is asking about a system of membrane-lined sacs in the cytoplasm with a membrane that is connected to the nuclear membrane. The options to choose from are mitochondrion, ribosomes, endoplasmic reticulum, and Golgi apparatus. The correct answer is option C, which is the endoplasmic reticulum. The endoplasmic reticulum (ER) is a network of flattened sacs and branching tubules that extend throughout the cytoplasm of eukaryotic cells. It is continuous with the nuclear membrane, which surrounds the nucleus, and is composed of two types: rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). RER is studded with ribosomes on its surface while SER lacks ribosomes. The ER is involved in various cellular processes, including protein synthesis, lipid metabolism, and detoxification. The RER, which has ribosomes attached to its surface, is responsible for the synthesis and modification of proteins that are destined for secretion, membrane insertion, or lysosomal degradation. The SER, on the other hand, is involved in lipid synthesis, hormone synthesis, and detoxification of drugs and toxins. In summary, the correct answer to the question is option C, which is the endoplasmic reticulum. The ER is a system of membrane-lined sacs that forms channels throughout the cytoplasm and whose membrane is continuous with the nuclear membrane. It is involved in various cellular processes, including protein synthesis, lipid metabolism, and detoxification.

Correct Answer: C. Atlas → axis → cervical → thoracic → lumbar → sacral

Correct Answer: B. where a river meets the sea

Correct Answer: D. Prothallus → spermatozoid → +egg cell → leafy plant → sporangium → spore

Correct Answer: B. 2

Correct Answer: C. are metamerically segmented

Correct Answer: D) Pecking

Explanation

Pecking is a form of feeding for birds not movement