Plant-Animal Mutualism: Pollination and the Fig-Fig Wasp Relationship
Biology · Organisms and Populations · NEET
Plant-animal mutualism is a (+/+) interaction where a plant gives an animal food (pollen or nectar) and the animal carries pollen from flower to flower, so both benefit. The fig and its fig wasp show an obligate one-to-one mutualism: each fig species is pollinated by only its own partner wasp species, and the wasp uses the fig fruit to lay eggs and feed its larvae on developing seeds. Memory hook: "Fig feeds the wasp's babies, the wasp feeds the fig's pollen" — neither can complete its life cycle alone.
The fig and its partner wasp form an obligate, species-specific (one-to-one) mutualism: the wasp pollinates the fig and, in return, uses the fruit as an egg-laying site and feeds its larvae on developing seeds. Both benefit (+/+), and neither can reproduce without the other.
Your doubts, answered
Is the fig and fig wasp relationship mutualism or commensalism?
It is mutualism (+/+), not commensalism. Both partners benefit: the fig gets pollinated by the wasp, and the wasp gets a place to lay eggs plus developing seeds to feed its larvae. In commensalism (+/0) only one species benefits and the other is unaffected. NEET has directly tested this: in a 2023 Odisha paper, 'female wasp and fig species' was the correct answer to which pair is NOT commensalism.
Why is the fig-fig wasp mutualism called 'obligate' and 'one-to-one'?
'Obligate' means neither species can complete its life cycle without the other. 'One-to-one' means a given fig species can be pollinated by only its own partner wasp species and no other. So each fig has its dedicated wasp and each wasp has its dedicated fig. This tight, species-specific dependence is why it is a favourite NEET example of close mutualism.
How is Yucca-moth different from the fig-fig wasp example?
They are the same type of interaction (obligate one-to-one mutualism), just different partners. In Yucca, the plant depends on the moth Tegeticula for pollination, and the moth's larvae feed on some of the developing seeds; neither can complete its life cycle without the other. NCERT calls this 'another' classic case alongside fig-wasp. NEET 2018 asked which plant shows this close relationship with a moth — the answer is Yucca.
Is ordinary pollination by bees or birds also mutualism?
Yes. When a plant offers rewards like pollen and nectar and the animal carries pollen while feeding, both benefit, so it is a plant-pollinator mutualism (+/+). NEET 2023 Phase 2 tested exactly this statement and the answer was mutualism. Note: not every pollination is mutualism — Ophrys orchid tricks a male bee with no reward (sexual deceit), which is a special case covered on the next page.
Why is a fig sometimes called a 'non-vegetarian' fruit?
Because a fig fruit encloses the tiny fig wasps that developed inside it, so the ripe fruit contains insect remains. This is a memory point, not a botanical rule. NEET 2025 gave two statements — 'fig is a non-vegetarian fruit as it has enclosed fig wasps' and 'fig wasp and fig tree exhibit a mutual relationship' — and marked both statements correct.
⚠️ The NEET trap ✗ Marking the fig-fig wasp pair as commensalism because the wasp 'lives on' the fig, like an epiphyte on a tree. ✓ Fig-fig wasp is mutualism (+/+): the fig is pollinated (benefit) and the wasp gets an egg-laying site plus seeds for its larvae (benefit). Only the orchid-on-tree, cattle egret-cattle and sea anemone-clown fish pairs are commensalism (+/0). 🧠 If BOTH partners get something, it can never be commensalism — commensalism needs one side to be a zero. Fig gives, wasp gives back, so plus-plus.
Real NEET questions
NEET 2023 (Odisha)
Between which among the following, the relationship is NOT an example of commensalism?
A · Orchid and the tree on which it grows
B · Cattle Egret and grazing cattle
C · Sea Anemone and Clown fish
D · Female wasp and fig species ✓
Solution: Orchid-on-tree, cattle egret-cattle and sea anemone-clown fish are all commensalism (+/0), where one benefits and the other is unaffected. The female wasp and fig share an obligate mutualism (+/+): the fig is pollinated by the wasp and the wasp's larvae are nourished by the developing seeds. So the pair that is NOT commensalism is female wasp and fig species.
NEET 2018
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
A · Banana
B · Yucca ✓
C · Hydrilla
D · Viola
Solution: Yucca and its pollinator moth (Tegeticula) share an obligate mutualism, exactly like the fig-fig wasp case: the moth pollinates the flower and lays eggs whose larvae feed on some developing seeds, so neither can complete its life cycle without the other. Banana, Hydrilla and Viola do not fit this one-to-one moth partnership.
NEET 2025
Statement I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it. Statement II: Fig wasp and fig tree exhibit a mutual relationship, as the fig fruit provides the wasp a place to lay eggs and the fig gets pollinated by the fig wasp. Choose the most appropriate answer.
A · Statement I is correct but statement II is incorrect
B · Statement I is incorrect but statement II is correct
C · Both statement I and statement II are correct ✓
D · Both statement I and statement II are incorrect
Solution: Statement II is directly from NCERT: fig and its partner wasp share a tight one-to-one mutualism — the wasp pollinates the fig while using the fruit as an egg-laying site and the developing seeds to nourish its larvae. Statement I follows because the ripe fig encloses the wasps that developed inside it, so it contains insect remains. Both statements are correct, so the answer is C.
Solved Organisms and Populations NEET PYQs
Try the real previous-year questions from this chapter — each with the answer and a full solution.
It is a (+/+) interaction where a plant rewards an animal with pollen or nectar and the animal carries the plant's pollen for reproduction, so both species gain.
Give the best NCERT example of tight mutualism.
The fig-fig wasp relationship: an obligate one-to-one mutualism where each fig species is pollinated only by its own wasp species, and the wasp uses the fig fruit to lay eggs and feed its larvae on developing seeds.
What signs represent mutualism in NEET tables?
Mutualism is (+ / +) — both species benefit. Compare: commensalism (+/0), amensalism (-/0), predation and parasitism (+/-), competition (-/-).
Is fig-fig wasp mutualism obligate or facultative?
Obligate. Neither the fig nor the wasp can complete its life cycle without the other, which is why it is a classic exam example.
How is this concept usually asked in NEET?
As sign-matching (+/+ = mutualism), 'which is NOT commensalism' traps, the Yucca-moth recall, plant-pollinator reward statements, and assertion-reason style statements about the fig fruit.
