QI. Why do herbivores have longer, small intestine than carnivores?
Q2.Write the balanced chemical equation for the process of photosynthesis.How photosynthesis occurs in desert plants?
Q3. In single celled organisms diffusion is sufficient to meet all their requirements of food, exchange of gases or removal of wastes but it is not in case of multicellular organisms. Explain the reason for this difference.
Q4. Draw a neat labeled diagram of human alimentary canal.
Q5. Explain the process of nutrition in Amoeba.
Q6. How do guard cells regulate the opening and closing of the stomata?
Q7.Explain exchange of gases in humans.
Q8.State the role of the following in human digestive system:
(a) Digestive enzymes
(b) Hydrochloric acid (Hel)
(c) Villi
Q9.Draw a diagram of human respiratory system and label the following:
(a) Part where air is filtered by fine hairs and mucus
(b) Part which terminates in balloon like structures
(c) Part which separates chest cavity from abdominal cavity
(d) Part where exchange of gases takes place.
Q10. Draw a neat labeled diagram of opened and closed stomata.
Answers
Answer:
1)The small intestine is longer in herbivore than in carnivore because herbivores eat only grass which is full of cellulose and the digestion of cellulose takes a long time. ... Herbivores need a longer small intestine to allow cellulose to be digested as taken from green plants.
2) 6CO2 + 6H2O — > C6H12O6 + 6O2. Generally, photosynthesis utilizes light vitality to change over carbon dioxide into a starch
3)Diffusion is a very slow process. If multicellular organisms used diffusion to meet all requirements of food, exchange of gases or removal of wastes it would take too much of time for carrying even a single particle in the body of the organism and hence diffusion is a process only for unicellular organisms
5)Nutrition in an Amoeba occurs through a process called phagocytosis where the entire organism pretty much engulfs the food it plans on eating up. The mode of nutrition in amoeba is known as holozoic nutrition. It involves the ingestion, digestion and egestion of food material.
6)The opening and closing of stomata are controlled by the guard cells. When water flows into the guard cells, they swell up and the curved surface causes the stomata to open. When the guard cells lose water, they shrink and become flaccid and straight thus closing the stomata.
7)Exchange of gases in humans
Oxygen gets carried by the haemoglobin of the red blood cells since it has a great affinity for oxygen. Each haemoglobin molecule binds to four molecules of oxygen. This oxygen that is picked up by haemoglobin gets transported by the blood to various tissues.