Solution : i) Alveoli are pouch-like air sac that is made up of simple squamous epithelium. ii) The alveoli are thin-walled and richly supplied with a network of blood vessels to facilitate the exchange of gases between blood in the capillaries and the air inside the alveoli. iii) These alveoli are balloon-like structures which provide …
Q. How are the alveoli designed to maximise the exchange of gases? Read More »
SOLUTION : The cellular respiration process that takes place in the presence of O2 gas is known as aerobic respiration.The cellular respiration process that happens without the presence of O2 gas is known as anaerobic respiration. Organisms that use the anaerobic mode of respiration: YeastLactic acid bacteriaEscherichia coli
SOLUTION : Autotrophic nutrition takes place through the process of photosynthesis. The necessities for autotrophic nourishment involve carbon dioxide( CO2), water (H2O), chlorophyll pigment, and sunlight. The by-products of photosynthesis are oxygen (O2) and carbohydrates ( Glucose,C6H12O6 )
SOLUTION : Saliva contains Mucus , water and salivary amylase, a digestive enzyme that converts starch to sugar. Saliva serves a variety of purposes in the digestive process, including: i) The mouth is lubricated with it.ii) It facilitates food digestion.iii) It aids in guarding against bacterial infections of the teeth.iv) It aids in digestion of …
Q. What is the role of saliva in the digestion of food? Read More »
Solution : Fats are present in the small intestine in the form of big globules. The small intestine receives the liver and pancreas secretions. To make it easier for the pancreatic enzyme lipase to work on the huge fat globules, the liver’s bile salts break them down into smaller globules. The emulsification of fats is what is …
Q. How are fats digested in our bodies? Where does this process take place? Read More »
Solution : All living things normally excrete waste through their urine. It is a waste product and clean solvent made of urea, salts, and other soluble nitrogen substances. Our body’s urine is made up of water, urea, minerals, and colours. Even in the body’s dissolved waste, the amount of extra water or water reabsorbed has …
Q. How is the amount of urine produced regulated? Read More »
Solution : The following are the methods that plants use to eliminate excretory products:(i) Stomata are the openings through which oxygen, the product of photosynthesis, is expelled. (ii) Stomata are the openings via which carbon dioxide created during respiration is expelled.(iii) Through transpiration, extra water is removed.(iv) When plants lose some parts, like leaves, other …
Q. What are the methods used by plants to get rid of excretory products? Read More »
SOLUTION : The structure and functioning of nephrons : Structure of Nephron i) The nephron is the functional unit of the kidney. ii) A nephron is the filtration unit of the kidney. iii) The main components of the nephron: Glomerulus, Bowman’s capsule Long tubule. iv) It consists of a tubule which is connected with collecting …
Q. Describe the structure and functioning of nephrons. Read More »
Excretion in Plants Plants use completely different strategies for excretion than those animals. Oxygen itself can be thought of as a waste product generated during photosynthesis! We have discussed earlier how plants deal with oxygen as well as CO2. They can get rid of excess water by transpiration. For other wastes, plants use the fact …
Excretion in Human Beings The excretory system of human beings includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra. Kidneys are located in the abdomen, one on either side of the backbone. Urine produced in the kidneys passes through the ureters into the urinary bladder where it is stored …
