Class 11 Biology Important Chapter 7 Structural Organisation in Animals

Class 11 Biology Important Chapter 7 Structural Organisation in Animals Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 11 Biology Important Solutions and select need one. AHSEC Class 11 Biology Additional Notes English Medium Download PDF. HS 1st Year Biology Important Solutions in English.

Class 11 Biology Important Chapter 7 Structural Organisation in Animals

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 11 Biology Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Biology Important Notes in English for All Chapters, You can practice these here.

Structural Organisation in Animals

Chapter: 7

IMPORTANT QUESTION AND ANSWER

Very Short and Short Answer Type Question: 

1. What is a tissue?

Ans: A tissue is a group of similar cells along with intercellular substances that perform a specific function.

2. What is the role of ureters in frogs?

Ans: Ureters carry urine from kidneys to the cloaca.

3. Name the three parts of the frog’s brain.

Ans: Forebrain, midbrain, and hindbrain.

4. Describe the external features of a frog.

Ans: A frog’s body has two parts: head and trunk, with no neck or tail. The skin is smooth, moist, and covered with mucous glands. The dorsal side is olive green with dark spots; the ventral side is pale yellow. It has bulging eyes with nictitating membranes and a tympanum (ear) behind each eye. The forelimbs end in four digits, and the larger hind limbs have five webbed digits for swimming.

5. Explain the process of digestion in frogs.

Ans: Food enters through the mouth and passes into the oesophagus, then to the stomach where gastric juices and hydrochloric acid break it down. The liver secretes bile stored in the gall bladder, which emulsifies fats. The pancreas secretes enzymes that digest proteins, carbohydrates, and fats. Digestion completes in the intestine where nutrients are absorbed by villi. Undigested waste is eliminated through the cloaca.

6. How do frogs respire on land and in water?

Ans: In water, frogs respire through their moist skin (cutaneous respiration) by diffusion of dissolved oxygen. On land, frogs use lungs for pulmonary respiration. Air enters through nostrils to the buccal cavity and then to the lungs. The buccal cavity lining also participates in gas exchange.

7. Describe the structure and function of the frog’s heart.

Ans: The frog’s heart has three chambers: two atria and one ventricle. It is covered by the pericardium membrane. Blood from the body enters the right atrium via the sinus venosus, and oxygenated blood from the lungs enters the left atrium. Both atria empty into the ventricle, which pumps blood into the conus arteriosus to the body. This arrangement supports the closed circulatory system.

8. What is the role of the kidneys and ureters in frogs?

Ans: The kidneys filter nitrogenous wastes from the blood and produce urine. The urine is transported by the ureters, which also act as the urinogenital ducts in males, to the cloaca for excretion.

9. Describe the male and female reproductive systems in frogs.

Ans: Males have a pair of testes near the kidneys, connected to the cloaca by vasa efferentia and urinogenital ducts. Females have a pair of ovaries, which produce eggs that pass through oviducts opening separately into the cloaca. Fertilisation is external in water, and females lay 2500-3000 eggs.

10. What is metamorphosis in frogs?

Ans: Metamorphosis is the process by which a tadpole (larval stage) transforms into an adult frog. Tadpoles live in water and breathe with gills, but during metamorphosis, they develop legs, lungs, and lose their tail to become terrestrial adult frogs.

11. What adaptations help frogs survive in both aquatic and terrestrial environments?

Ans: Frogs have moist skin for cutaneous respiration in water and lungs for breathing on land. Their strong, webbed hind legs help in swimming and jumping. They can camouflage by changing skin color and undergo aestivation and hibernation to survive extreme temperatures.

12. Why is the frog considered an important animal in the ecosystem?

Ans: Frogs control insect populations by feeding on them, thus protecting crops. They are also an essential part of the food chain, serving as both predator and prey, maintaining ecological balance.

13. Describe the structure and function of the frog’s lungs.

Ans: Frog lungs are paired, sac-like organs located in the upper trunk region. They are responsible for pulmonary respiration, allowing the frog to breathe air on land. Air enters through nostrils, passes through the buccal cavity, and fills the lungs.

14. How do frogs carry out excretion?

Ans: Frogs excrete nitrogenous waste primarily as urea. Kidneys filter waste from blood and produce urine, which passes through ureters to the urinary bladder and then to the cloaca for elimination.

15. What is the significance of the frog’s skin?

Ans:The frog’s skin is moist and has mucous glands to prevent drying out. It also acts as a respiratory surface in water, allowing oxygen to diffuse directly into the blood.