Q. What is the role of Acid in stomach?
A. Hydrochloric acid which is produced in the stomach kills the germs in our food and it also neutralizes the food which is alkaline in
nature.
Q. What is the reason that litmus paper placed on the tongue changes its colour?
A. Saliva in the mouth contains alkaline character. So red litmus paper is changed into blue colour.
Q. How can you say that carbohydrates are not digested in stomach?
A. No enzymes are produced in stomach which can digest carbohydrates. So I can say that carbohydrates are not digested in stomach.
Q. Imagine that what changes are done when the air passes through nasal cavities in inspiration?
A. Air is filtered in nasal cavities by mucous lining and the hairs growing from its sides remove tiny particles of dust. Air temperature
is brought close to that of body.
Q. What is the main reason for feeling pain in muscles after strenuous exercises?
A. Due to anaerobic respiration in muscles, large amount of lactic acid is accumulated and this results in muscular pains.
Q. “If there are no algae, there will be no fishes in the sea”. How do you justify?
A. Algae produce Oxygen as a result of photosynthesis. This Oxygen is utilized by the fishes in the sea for respiration. If there is no oxygen fishes may die.
Q. Ramayya travelled from Hyderabad to Vijayawada in bus throughout the night. What changes can we observe in his legs? What do we call this stage?
A. The supply of nutrients to the cells the liquid portion of the blood with nutrients flows out of the capillaries. Hence it is clearly seen
that his lower part of the legs are swollen. This stage is called edema.
Q. What do we call the natural movements of the protoplasm?
A. Brownian movements.
Q. Imagine what happens if waste materials are not sent out of the body from time to time?
A. The body becomes poisonous and death in organisms takes place.
Q. What are the main parts in Nephron that makes urine?
A. Bowman’s capsule and tubule.
Q. Write any two uses of Tannins.
A. Tannins are used in tanning of leathers and in medicines.
. When does kidney transplantation take place? From whom kidney is obtained?
A. Kidney transplantation is a permanent solution for renal failure patients. It is obtained preferably from close relative.
Q. When plants are exposed to external stimuli, they respond. What do we call this type of response?
A. Nastic movements.
Q. How does anger occur? What is its effect?
A. Increased levels of Adrenalin are responsible for anger. Anger persists for longer period of time, regular metabolic activities are
disturbed.
Q. In which method thousands of plants can be grown in a very short interval of time?
A. Tissue Culture.
Q. Is it necessary for the replication of DNA in interphase of the cell division? Why?
A. Yes it is necessary for the replication of DNA. After few cell divisions all the chromosomes will disappear from the cell.
Q. What are Chorion, Amnion and Allantois?
A. These are the membranes that cover the embryo.
Q. What are the organ systems involved in digestion of food which we eat?
A. Digestive system, muscular system, nervous system, endocrine system, circulatory system, skeletal system and excretory system.
Q. Endocrine system also involved in the process of digestion. What are the hormones secreted in digestive system?
A. 1. Ghrelin and leptin regulates hunger.
2. Secretin and cholecystokinin stimulates pancreas and liver.
Q. The dental formula of human is 2/2, 1/1, 2/2, 3/3.
a) How many incisors present in his mouth?
b) How many tearing teeth are present in his mouth?
A. a) 8 b) 4
Q. What is the usual range of pH of our mouth? And after eating?
A. Usual range is below 7 − Acidic in nature.
After eating it is beyond 7 − Alkaline nature.
Q. Write the phenotype and genotype ratios by observing the following matrix.
A. Phenotype ratio = 3 : 1
Genotype ratio = 1 : 2 : 1
Q. When a flood comes short paddy plants are died but long paddy plants are survived. What do we call this effect?
A. Sometimes accidents change frequency of genes in small populations. This is known as Genetic drift.
Q. Archaeopteryx is recognized as connecting link between aves and reptiles. Why?
A. Archaeopteryx has some avian characters and some reptilian characters. Hence it is called so.
Q. What is pyramid of Biomass?
A. A graphical representation designed to show the quantity of living matter at each tropic level in a given ecosystem is called “pyramid
of biomass”.
Q. What is sustainable development?
A. When we use the environment in ways that ensure we have resources for the future, it is called sustainable development.
Q. “Man is called moving museum”. How do you support it?
A. There are nearly 180 vestigial organs like appendix in human beings. Hence he is called so.
Q. Is there any reason for the intestine to be coiled with many folds? In what way it is useful during the process of digestion?
A. 1. It slows down the passage of the food along the intestine.
2. It also increases the surface area to absorb more nutrients and water.
Q. Why KOH is used in Moll’s half leaf experiment?
A. To absorb carbon dioxide present in the glass jar.
Q. Grass → Rabbit → Snake → Eagle. Name the producers and Secondary consumer in the above food chain.
A. Producer – Grass
Secondary consumer – Snake.
Superb !!