Frog: digestive, circulatory, respiratory, nervous and reproductive systems
- In frog, the Renal portal system is a special venous connection that acts to link : Answer: 4. Kidney and lower part of body Key idea: A portal system begins and ends in capillaries. In frogs, the renal portal system carries... 1
- Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs. Choose the correct answer from the following : Answer: 3. The statement is false for water but true for land Key idea: Frogs breathe through the skin in water, and through the lungs on la... 1
- What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog ? Answer: 4. Vena cava Key idea: In a frog, veins called the vena cavae (precaval and postcaval) bring deoxygenated blood from the body to the... 1
- Once the undigested and unabsorbed substances enter the caecum, their backflow is prevented by- Answer: 3. Ileo - caecal valve Key idea: The valve between the ileum and caecum prevents backflow. The ileo-caecal valve guards the opening... 1
- Which of the following functions is not performed by secretions from salivary glands ? Answer: 1. Digestion of disaccharides Key idea: Salivary amylase digests starch, but no salivary enzyme digests disaccharides. Salivary amyl... 1
- Following are the statements about prostomium of earthworm.(a) It serves as a covering for mouth.(b) It helps to open cracks in the soil into which it can crawl.(c) It is one of the sensory structures.(d) It is the first body segment.Choose the corre… Answer: 1. (a), (b) and (c) are correct The prostomium is a lobe that covers the mouth, is sensory and helps in opening cracks in the soil.... 1
- Which of the following characteristics is incorrect with respect to cockroach ? Answer: 1. A ring of gastric caeca is present at the junction of midgut and hind gut. The incorrect statement is the one about gastric caeca... 1
- Which of the following features is used to identify a male cockroach from a female cockroach ? Answer: 3. Presence of caudal styles Key idea: Male and female cockroaches differ in the last abdominal segments. Males have a pair of threa... 1
- Frog's heart when taken out of the body continues to beat for sometime.Select the best option from the following statements.(a) Frog is a poikilotherm.(b) Frog does not have any coronary circulation.(c) Heart is "myogenic" in nature.(d) Heart is auto… Answer: 3. (c) and (d) An isolated frog heart keeps beating because it is myogenic (the beat starts in the heart muscle itself) and autoexci... 1
- Select the correct route for the passage of sperms in male frogs : Answer: 3. Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca In a male frog, sperms travel: testes → vasa effe... 1
- In the stomach, gastric acid is secreted by the : Answer: 2. parietal cells The parietal (oxyntic) cells of the gastric glands secrete HCl and intrinsic factor. Peptic (chief) cells secrete... 1
- Which of the following guards the opening of hepatopancreatic duct into the duodenum ? Answer: 4. Sphincter of Oddi The sphincter of Oddi guards the opening of the hepatopancreatic duct into the duodenum. The pyloric sphincter... 1