1. What is the main function of tissues in multicellular organisms?
a) To perform photosynthesis
b) To provide structural support only
c) To perform a specific function collectively
d) To form reproductive cells
Answer: c) To perform a specific function collectively
2. What type of blood circulation does a frog have?
a) Open circulation
b) Closed circulation with double circulation
c) Closed circulation with single circulation
d) Lymphatic circulation only
Answer: c) Closed circulation with single circulation
3. Which organ in frogs is responsible for secreting bile?
a) Stomach
b) Pancreas
c) Liver
d) Cloaca
Answer: c) Liver
4. What feature distinguishes male frogs from female frogs?
a) Larger body size
b) Presence of vocal sacs and copulatory pad
c) Ability to camouflage
d) Longer hind limbs
Answer: b) Presence of vocal sacs and copulatory pad
5. Frogs respire through their skin in water by a process known as:
a) Pulmonary respiration
b) Buccal respiration
c) Cutaneous respiration
d) Diffusion
Answer: c) Cutaneous respiration
6. Where does digestion of carbohydrates and proteins primarily occur in a frog's digestive system?
a) Stomach
b) Buccal cavity
c) Intestine
d) Cloaca
Answer: c) Intestine
7. What is the name of the larval stage in frogs?
a) Caterpillar
b) Nymph
c) Tadpole
d) Pupa
Answer: c) Tadpole
8. Frogs exhibit sexual dimorphism. Which of the following is true for male frogs?
a) Have more digits than females
b) Have larger vocal sacs
c) Lay up to 3000 eggs
d) Do not participate in mating
Answer: b) Have larger vocal sacs
9. Which structure in a frog’s body opens to the exterior for passing fecal matter, urine, and gametes?
a) Cloaca
b) Rectum
c) Ureter
d) Buccal cavity
Answer: a) Cloaca
10. What helps frogs maintain ecological balance?
a) Their ability to camouflage
b) Their role in the food chain as insect eaters
c) Their reproduction rate
d) Their poikilothermic nature
Answer: b) Their role in the food chain as insect eaters
11. What is the main characteristic of poikilothermic animals like frogs?
a) Their body temperature is constant regardless of the environment
b) They maintain higher body temperatures in cold climates
c) Their body temperature varies with the environment
d) They can survive only in water
Answer: c) Their body temperature varies with the environment
12. What process allows frogs to survive extreme summer and winter conditions?
a) Mimicry
b) Metamorphosis
c) Aestivation and hibernation
d) Camouflage
Answer: c) Aestivation and hibernation
13. Which of the following structures helps frogs in swimming?
a) Webbed digits of hind limbs
b) Vocal sacs
c) Cloaca
d) Buccal cavity
Answer: a) Webbed digits of hind limbs
14. Which organ is responsible for excreting nitrogenous wastes in frogs?
a) Liver
b) Lungs
c) Kidneys
d) Cloaca
Answer: c) Kidneys
15. How do frogs absorb water?
a) Through their mouth
b) By drinking directly with their tongue
c) Through their skin
d) Through their nostrils
Answer: c) Through their skin
16. What distinguishes the blood of frogs from that of mammals?
a) It lacks white blood cells
b) It has nucleated red blood cells
c) It is green instead of red
d) It does not contain haemoglobin
Answer: b) It has nucleated red blood cells
17. What structure protects a frog’s eyes while underwater?
a) Tympanum
b) Nictitating membrane
c) Buccal cavity
d) Cloaca
Answer: b) Nictitating membrane
18. Which part of the frog’s brain is associated with vision?
a) Olfactory lobes
b) Cerebellum
c) Optic lobes
d) Medulla oblongata
Answer: c) Optic lobes
19. Which endocrine gland in frogs regulates metabolic rate?
a) Pituitary gland
b) Thyroid gland
c) Adrenal gland
d) Pineal gland
Answer: b) Thyroid gland
20. What is the purpose of villi and microvilli in the frog’s intestine?
a) To secrete digestive enzymes
b) To absorb digested food
c) To produce bile
d) To eliminate waste
Answer: b) To absorb digested food
21. What type of fertilization occurs in frogs?
a) Internal
b) External
c) Both internal and external
d) Parthenogenesis
Answer: b) External
22. What is the function of the cloaca in frogs?
a) It is a digestive gland
b) It stores bile
c) It is a common chamber for passing excretory, digestive, and reproductive materials
d) It regulates body temperature
Answer: c) It is a common chamber for passing excretory, digestive, and reproductive materials
23. Which part of a frog's nervous system controls involuntary actions?
a) Forebrain
b) Peripheral nervous system
c) Autonomic nervous system
d) Cerebral hemispheres
Answer: c) Autonomic nervous system
24. How does the liver contribute to the digestive process in frogs?
a) It secretes digestive enzymes directly into the stomach
b) It produces bile for fat emulsification
c) It absorbs nutrients
d) It helps move food through the alimentary canal
Answer: b) It produces bile for fat emulsification
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