Q1.
Which of the following statements about the autotrophs is incorrect?
(a) They synthesize carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level in food chain
Q2.
The internal (cellular) energy reserve in autotrophs is
(a) glycogen
(b) protein
(c) starch
(d) fatty acid
Q3.
Choose the event that does not occur in photosynthesis
(a) Absorption of light energy by chlorophyll
(b) Oxidation of carbon to carbon-dioxide
(c) Reduction of carbon dioxide to carbohydrates
(d) Conversion of light energy to chemical energy
Q4.
In which of the following groups of organisms, food materials are broken down outside the body and absorbed?
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm
Q5.
The exchange of gases in stems takes place by
(a) stomata
(b) lenticles
(c) chloroplast
(d) chlorophyll
Q6.
Opening and closing of stomatal pore is a function performed by:
(a) Stomata
(b) Chlorophyll
(c) Guard cells
(d) Chloroplast
Q7.
Enzyme responsible for the digestion of carbohydrates
(a) amylase
(b) trypsin
(c) pepsin
(d) lipase
Q8.
The autotrophic mode of nutrition requires
(a) carbon dioxide and water
(b) Chlorophyll
(c) sunlight
(d) all of the above
Q9.
Movement of food through the oesophagus is due to
(a) lubrication by saliva
(b) Peristalsis
(c) Diffusion
(d) turgor pressure
Q10.
Which is the first enzyme to mix with food in the digestive tract?
(a) pepsin
(b) trypsin
(c) amylase
(d) lipase
Q11.
Most of the digestion and absorption of food takes place in the
(a) small intestine
(b) liver
(c) stomach
(d) large intestine
Q12.
If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
(a) Protein breaking down into amino acids
(b)Starch breaking down into sugars
(c) Fats breaking down into fatty acids and glycerol
(d) Absorption of vitamins
Q13.
A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains:
(a) complex protein
(b) simple protein
(c) Fats
(d) starch
Q14.
The opening and closing of stomatal pore depends upon
(a) oxygen
(b) temperature
(c) water in guard cell
(d) concentration of CO2 in stomata
Q15.
The process by which amoeba obtain its food is called
(a) assimilation
(b) diffusion
(c) absorption
(d) phagocytosis
Q16.
The liver secretes bile, needed to digest fats in our body. The pancreas secretes several enzymes needed to break down food.
Which of the following is true of the food that we eat?
(a) It passes only through our liver
(b) It passes only through our pancreas
(c) It passes through both our liver and pancreas
(d) It passes neither through our liver nor pancreas
Q17.
Organism break down large food molecule to small molecules. How does this breakdown help the organism?
(a) It releases a lot of energy
(b) It ensures that there are enough raw material available to organism
(c) It converts the large molecules into small molecules that can pass through the cell membrane
(d) It makes sure that the liberation of heat by the breakdown of large molecules does not occur inside the cell.
Q18.
Pseudopodia are
(a) Small hair-like structures present on unicellular organisms
(b) False feet developed in some unicellular organisms
(c) Long, tube-like structures coming out of the mouth.
(d) Suckers which are attached to the walls of the intestines.
Q19.
What will happen if mucus is not secreted by the gastric glands?
(a) Breakdown of protein into simple molecule will not occur.
(b) HCl will degrade the stomach lining.
(c) Microbes present in food will damage stomach.
(d) Nothing will happen
Q20.
Which of the following statement is incorrect about villi?
(a) Villi are finger like projections in the wall of small intestine
(b) Villi provide a large surface area for maximum absorption
(c) Villi secrete digestive enzymes for complete digestion of food
(d) Villi are richly supplied with blood vessels
