Answer the questions
1- Which of the following statements about 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) de convert carbon dioxide and water into carbohydrates in the absence of sunlight.
D) they constitute the first trophic level in food chains.
ANSWER - ( C )
2- In which of the following organisms is food material broken down inside the body and absorbed?
A) mushroom, green plants, amoeba
B) test, mushroom, bread mold
C) paramecium, amoeba, cuscuta
D) cuscuta, lice, tapeworm
ANSWER- (B)
3- If salivary amylase is lacking in the Saliva, which of the following events in the mouth cavity will be affected?
A) proteins breaking down into amino acids
B) starch breaking down into sugars
C) fats breaking down into fatty acids and glycerol
D) absorption of vitamins
ANSWER- (B)
4- Select the correct statement.
A) heterotroph do not synthesize their food
B) heterotrophs utilize solar energy for photosynthesis
C) heterotrophs synthesize their food
D) heterotrophs are capable of converting carbon dioxide and water into carbohydrates
ANSWER- (A)
5- The autotrophic mode of nutrition requires
A) carbon dioxide and water
B) sunlight
C) chlorophyll
D) all of these
ANSWER- (D)
6- The inner lining of the stomach is protected by
A) pepsin
B) mucus
C) salivary amylase
D) bile
ANSWER- (B)
7- A few drops of iodine solution were added to rice water. The answer turns Blue-black. This indicates that rice water contains
A) complex proteins
B) simple proteins
C) fats
D) starch
ANSWER- (D)
8- The breakdown of pyruvate to give carbon dioxide water and energy takes place in
A) cytoplasm
B) mitochondria
C) chloroplast
D) nucleus
ANSWER- (B)
9- During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the
A) cytoplasm
B) chloroplast
C) mitochondria
D) Golgi body
ANSWER- (A)
10- Which of the following complete the given equation? glucose + oxygen > ?
A) only carbon dioxide + water + energy
B) carbon dioxide + water
C) only carbon dioxide
D)Only water + energy
ANSWER- (A)
11- Which of the following take place after heavy exercise?
A) our body needs more oxygen
B) our body needs to replace the energy used
C) aur body needs to get rid of excess carbon dioxide
D) all of these
ÀNSWER - (D)
12- Which of these statements is correct about alveoli?
A) they form a considerable surface area
B) they have a skinny wall
C) they are covered with blood capillaries
D) all of these
ANSWER- (D)
13- As air passes through the nasal cavity, it is
A) filtered in the nostrils
B) moistened by mucus
C) warmed to the body temperature
D) all of these
ANSWER- (D)
14- What prevents the backflow of blood inside the heart during contraction?
A) valves in the heart
B) thick muscular walls of ventricles
C) thin walls of atria
D) all of these
ANSWER- (A)
15- The blood leaving the tissues becomes richer in
A) carbon dioxide
B) water
C) hemoglobin
D) oxygen
ANSWER- (A)
16- The xylem in plants are responsible for
A) transport of water
B) transport of food
C) transport of amino acids
D) transport of oxygen
ANSWER- (A)
17- Which of the following is the structural and functional unit of the excretory system?
A) neuron
B) nephron
C) alveolus
D) both (A) and (B)
ANSWER- (B)
18) Which of the following substances are removed from blood in the kidney?
A) water
B) urea
C) sodium
D) ammonia
ANSWER- (B)
19- The kidneys in human beings are a part of the system for
A) nutrition
B) respiration
C) excretion
D) transportation
ANSWER- (C)
20- Which of the following is used artificially to remove nitrogenous waste products from the blood?
A) ventilator
B) transfusion
C) hemodialysis
D) angiogram
ANSWER- (C)
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