Nutrition Questions

Objective questions

Which statement best distinguishes autotrophic from heterotrophic nutrition?

A) Autotrophs ingest food while heterotrophs absorb nutrients B) Autotrophs synthesize organic food from inorganic substances C) Heterotrophs rely on sunlight directly D) Autotrophs depend on other organisms

Correct Answer: B) Autotrophs synthesize organic food from inorganic substances

An organism that converts inorganic carbon into organic compounds using chemical energy is a:

A) Photoheterotroph B) Chemoautotroph C) Saprophyte D) Parasite

Correct Answer: B) Chemoautotroph

Which process is common to all forms of heterotrophic nutrition?

A) Photosynthesis B) Energy release from organic substances C) Carbon fixation D) Nitrogen fixation

Correct Answer: B) Energy release from organic substances

Which condition would most limit the survival of photoautotrophs?

A) Absence of nitrogen B) Lack of sunlight C) Presence of oxygen D) Excess water

Correct Answer: B) Lack of sunlight

Chemoautotrophs are ecologically important because they:

A) Produce oxygen B) Break down organic matter C) Convert inorganic substances into usable nutrients D) Feed on plants

Correct Answer: C) Convert inorganic substances into usable nutrients

Which organism would most likely survive in a deep-sea hydrothermal vent?

A) Green algae B) Nitrosomonas C) Grass D) Mushroom

Correct Answer: B) Nitrosomonas

The major difference between photoautotrophs and chemoautotrophs lies in their:

A) Source of carbon B) Mode of reproduction C) Source of energy D) Cell structure

Correct Answer: C) Source of energy

Which of the following organisms combines both autotrophic and heterotrophic modes under certain conditions?

A) Fungi B) Some protists C) Mammals D) Bacteria only

Correct Answer: B) Some protists

A heterotroph that feeds on already digested food from another organism is most likely:

A) Holozoic B) Saprophytic C) Parasitic D) Autotrophic

Correct Answer: C) Parasitic

Which stage is unique to holozoic nutrition compared to other modes?

A) Absorption B) Assimilation C) Ingestion D) Respiration

Correct Answer: C) Ingestion

A lion feeding on a zebra and a vulture feeding on its remains illustrate:

A) Herbivory and parasitism B) Carnivory and scavenging C) Omnivory and saprophytism D) Symbiosis

Correct Answer: B) Carnivory and scavenging

Which organism is least likely to exhibit holozoic nutrition?

A) Human B) Amoeba C) Mushroom D) Dog

Correct Answer: C) Mushroom

Which feature best enhances survival of endoparasites?

A) Ability to photosynthesize B) Thick protective body covering C) Reduced digestive system D) High mobility

Correct Answer: C) Reduced digestive system

A parasite that causes minimal harm to its host is likely to:

A) Kill the host quickly B) Maintain a long-term relationship C) Become autotrophic D) Live outside the host

Correct Answer: B) Maintain a long-term relationship

Which of the following is an ectoparasite-host interaction?

A) Tapeworm in intestine B) Ascaris in gut C) Tick on dog D) Plasmodium in blood

Correct Answer: C) Tick on dog

The main disadvantage of parasitic nutrition is:

A) Dependence on host survival B) Need for sunlight C) Lack of enzymes D) Inability to reproduce

Correct Answer: A) Dependence on host survival

In symbiosis, both organisms benefit through:

A) Competition B) Mutual exchange of nutrients/services C) Parasitism D) Independent living

Correct Answer: B) Mutual exchange of nutrients/services

Which of the following is NOT a mutual benefit in symbiosis?

A) Food exchange B) Protection C) One organism harmed D) Shelter

Correct Answer: C) One organism harmed

If protozoa were removed from a termite’s gut, the termite would likely:

A) Digest cellulose faster B) Die from starvation C) Become autotrophic D) Absorb more nutrients

Correct Answer: B) Die from starvation

Lichens are successful in harsh environments because:

A) They are parasites B) They combine photosynthesis and protection C) They reproduce rapidly D) They absorb nutrients from air only

Correct Answer: B) They combine photosynthesis and protection

Saprophytes play a key ecological role by:

A) Producing oxygen B) Recycling nutrients C) Killing hosts D) Fixing nitrogen

Correct Answer: B) Recycling nutrients

Why is extracellular digestion important in saprophytes?

A) They lack digestive enzymes B) They cannot ingest solid food C) They rely on sunlight D) They live in water

Correct Answer: B) They cannot ingest solid food

Which condition favors saprophytic growth?

A) Dry environment B) Presence of dead organic matter C) High light intensity D) Lack of oxygen

Correct Answer: B) Presence of dead organic matter

Which organism would most likely compete with saprophytes?

A) Herbivores B) Decomposers C) Carnivores D) Producers

Correct Answer: B) Decomposers

Carnivorous plants supplement their nutrition mainly due to deficiency of:

A) Oxygen B) Carbon dioxide C) Nitrogen D) Water

Correct Answer: C) Nitrogen

Why do carnivorous plants still perform photosynthesis?

A) To digest insects B) To obtain energy C) To produce enzymes D) To trap prey

Correct Answer: B) To obtain energy

Which adaptation allows Nepenthes to trap insects effectively?

A) Sticky leaves B) Deep pitcher with digestive fluid C) Strong roots D) Bright flowers

Correct Answer: B) Deep pitcher with digestive fluid

Drosera captures prey mainly through:

A) Mechanical trapping B) Sticky secretions C) Venom injection D) Root absorption

Correct Answer: B) Sticky secretions

Carnivorous plants are best described as:

A) Fully heterotrophic B) Fully autotrophic C) Partially autotrophic D) Saprophytic

Correct Answer: C) Partially autotrophic

Which pair correctly matches organism and mode of nutrition?

A) Mushroom – holozoic B) Tapeworm – saprophytic C) Nitrosomonas – chemoautotrophic D) Goat – autotrophic

Correct Answer: C) Nitrosomonas – chemoautotrophic

Which mode of nutrition involves the least dependence on other living organisms?

A) Parasitic B) Holozoic C) Autotrophic D) Saprophytic

Correct Answer: C) Autotrophic

A breakdown in symbiotic relationships would most directly affect:

A) Only plants B) Only animals C) Both organisms involved D) Only parasites

Correct Answer: C) Both organisms involved

Which organism would survive best in a nutrient-poor but sunny environment?

A) Mushroom B) Carnivorous plant C) Tapeworm D) Bacterium

Correct Answer: B) Carnivorous plant

If all saprophytes were removed from an ecosystem, what would occur?

A) Increase in plant growth B) Accumulation of dead matter C) More oxygen production D) Decrease in herbivores

Correct Answer: B) Accumulation of dead matter

Which of the following is a key similarity between saprophytes and parasites?

A) Both photosynthesize B) Both depend on organic matter C) Both ingest solid food D) Both are autotrophic

Correct Answer: B) Both depend on organic matter

Which mode of nutrition is most energy efficient for the organism?

A) Parasitic B) Autotrophic C) Holozoic D) Saprophytic

Correct Answer: B) Autotrophic

A plant growing in nitrogen-poor soil evolves insect-trapping leaves. This is an example of:

A) Structural adaptation B) Reproductive adaptation C) Behavioral adaptation D) Physiological adaptation

Correct Answer: A) Structural adaptation

Which organism demonstrates both digestion and absorption externally?

A) Amoeba B) Mushroom C) Goat D) Tapeworm

Correct Answer: B) Mushroom

Which relationship is most likely to become parasitic if conditions change?

A) Symbiotic B) Autotrophic C) Saprophytic D) Holozoic

Correct Answer: A) Symbiotic

The main evolutionary advantage of heterotrophic nutrition is:

A) Independence from environment B) Ability to exploit diverse food sources C) Ability to produce own food D) Reduced energy use

Correct Answer: B) Ability to exploit diverse food sources

Theory Questions

Give and explain two forms of heterotrophic nutrition

Explain the terms Photosynthesis and chemosynthesis

What are heterotrophs?

Briefly describe the modification of the mouth parts of a grasshopper to its mode of feeding