MZOE 002 Solved Guess Paper 2026 for IGNOU Animal Behaviour and Animal Welfare Ethics (MSCZOO)

Explain the difference between proximate and ultimate causes of behaviour in relation to sleep. Also differentiate between innate and acquired behaviour.

Meaning. While studying a particular behaviour, four salient questions should be asked and answered: mechanism, development, survival value or function, and phylogeny.

Proximate causes, the first two questions.

1. Mechanism. The physiological machinery that senses the stimulus and reacts to it. It tells us how the behaviour happens and covers sensory systems, effector organs, hormone levels and genes.
2. Development. The changes at each growth stage that build or alter the behaviour. It also covers learned behaviour.

Ultimate causes, the last two questions.

3. Function. The benefit the behaviour gives, mainly for survival and reproductive fitness.
4. Phylogeny. The evolutionary history of the behaviour. Did it come from an ancestor, and did it change over time?

Example of sleep. The proximate causes of sleep are the anterior hypothalamus, ion channels, neurotransmitters, hormones, cytokines, genes and circadian rhythm. Sleep is seen at all life stages, but its length and cycles change with age. The ultimate causes are energy conservation, synaptic optimisation, modulation of immune responses, cognition, psychological well-being and avoiding danger. Sleep is reported in worms, flies, fish, birds and humans.

Innate and acquired behaviour. Konrad Lorenz gave this classification. Innate behaviour is mainly decided by genes, is shown without earlier experience, responds to a fixed stimulus, is error-proof and safer, and the knee-jerk reflex is its example. Acquired behaviour is mainly decided by the environment, builds up slowly as the animal grows, is learnt by watching and copying adults, is flexible but riskier, and young animals learning to forage is its example.

Conclusion. Proximate causes tell us how a behaviour works, ultimate causes tell us why it evolved. Innate behaviour is fixed and safe, acquired behaviour is flexible and changes with the environment.

Explain classical conditioning and its components in Pavlov's experiments. Differentiate between classical and operant conditioning.

Meaning. Classical conditioning is a type of learning in which a neutral stimulus is paired with an innate reflex, after which the neutral stimulus draws the same behavioural response as the innate reflex.

Ivan P. Pavlov, the Nobel Prize winning Russian physiologist, first showed this. While studying digestive enzymes in saliva he fixed a cannula through a dog's cheek and collected the saliva, and noticed the dogs salivated on merely seeing the technician who fed them.

1. Unconditioned stimulus. The stimulus that naturally produces a response. In Pavlov's work it is the food.
2. Unconditioned response. The response to it, here salivation on seeing or eating food.
3. Neutral stimulus. The sound of the bell at the start. Dogs do not normally salivate for a bell.
4. Conditioned stimulus. Once the animal links the bell with the food, the bell alone makes the dog salivate.
5. Conditioned response. The saliva produced for the sound of the bell.

Three stages. Acquisition is when the dog learns to respond to the conditioned stimulus. Extinction happens when the bell stops and only food is given, so the response to the bell fades. Spontaneous recovery is the weak return of that response after a period of rest.

Classical versus operant. In classical conditioning a neutral stimulus is paired with an innate reflex, the animal is passive, the driving force is association between two stimuli, the founder is Pavlov, and the example is a dog salivating at a bell.

In operant conditioning the consequence of a behaviour decides whether it is repeated, the animal is active and operates in its environment, the driving force is reward or punishment, the founder is B. F. Skinner building on Thorndike's Law of Effect of 1898, and the example is a rat pressing a lever in a Skinner box for a food pellet.

Conclusion. Both are associative learning. In classical conditioning the animal links two stimuli, in operant conditioning it learns from the result of its own action.

Define altruism and explain its interrelationship with inclusive fitness. Write Hamilton's rule. Differentiate group and kin selection.

Meaning. Altruistic behaviour is a selfless form of cooperative behaviour for the benefit of other individuals in the group, and it may be detrimental to the individual performing it.

In altruism an individual raises the fitness of others at the cost of its own. It is commoner among closely related individuals and in species with little dispersal, because there the neighbours are kin. Empathy, compassion and a sense of moral obligation are the psychological factors research points to.

Relatedness. The coefficient of relatedness r is the probability of sharing an allele by common descent. It is 1 in identical twins and 0 in unrelated animals, 0.5 for parent and progeny and for full siblings, 0.25 for half siblings, uncle and niece, and grandparent and grandchild, and 0.125 for first cousins.

In honey bees the relatedness of workers to the queen is 0.75, higher than siblings in other diploid organisms, while queen to progeny is 0.5. This is what justifies being a worker in the colony.

Inclusive fitness. It takes into account an individual's own reproductive success plus the reproductive success of kin weighted by relatedness, so inclusive fitness equals direct fitness plus indirect fitness. Hamilton proposed that it offers a mechanism for the evolution of altruism and that natural selection favours maximising it.

Hamilton's rule. Altruism is favoured by natural selection when rB is greater than C, where C is the reproductive cost to the altruist, r is the degree of relatedness and B is the reproductive benefit to the recipient. It follows that an individual will be more altruistic towards a close relative than a distant one.

Group versus kin selection. In group selection natural selection acts on the group, behaviour benefiting the whole group is favoured even at heavy individual cost, Charles Darwin was an early proponent in 1871 and V. C. Wynne-Edwards formalised it in 1962. Red grouse curtailing reproduction at high density is the example, and its main flaw is that a selfish mutation would outcompete the altruists.

In kin selection, selection occurs at the level of the gene and helping kin passes on shared genes. John Maynard Smith coined the term in 1964 for the theory of R. A. Fisher and J. B. S. Haldane, Hamilton's kin discrimination and population viscosity are the two mechanisms, and its flaw is that the altruist must tell kin from non-kin.

Conclusion. Altruism costs the giver and benefits the receiver. Inclusive fitness and Hamilton's rule explain why it survives, and kin selection explains it far better than group selection.

Discuss the origin and evolution of the Five Freedoms with examples. Discuss their advantages and limitations.

Meaning. The Five Freedoms are the outcome-based principles or ideals of animal welfare. They arose from concern for the lives of animals in intensive agriculture.

Origin. The origins trace to the Brambell Committee Report, published in the UK in 1965, which followed public reaction to Ruth Harrison's book Animal Machines of 1964. The British Government asked Professor Roger Brambell to investigate intensive farming in Europe. The Report defined welfare in terms of both mental well-being and physical state, accepted that animals are sentient, rejected the idea that productivity indicates welfare, and condemned excessive confinement.

Its outcome was a list of five behavioural freedoms that a confined animal must be able to perform: to stand up, lie down, turn around, stretch its limbs and groom all parts of the body. These later became the Five Freedoms, borrowing the phrase from Franklin Roosevelt, who used the Four Freedoms in 1941 to define human rights.

1. Freedom from hunger, thirst and malnutrition. The basic needs of food and drinking water.
2. Freedom from thermal and physical discomfort. Housing suitable for that species.
3. Freedom from pain, injury and disease. The health needs of the animal.
4. Freedom to express normal behaviour. Space, facilities and company of the animal's own kind.
5. Freedom from fear and distress. Protection from negative emotional states.

The Five Freedoms in fact list 11 requirements for good welfare. Initially they were only the principles, and the provisions, the guidance on how each Freedom may be achieved, were added later.

Advantages.

1. They are the basis of much legislation and guidance worldwide and are used widely in the education of animal scientists and veterinarians.
2. They are wide-ranging and take in two broad states, distress and discomfort, which carry many complex emotions.
3. They are inclusive and overlapping, since an animal in pain under the third Freedom may eat less and feel hunger under the first with distress under the fifth, yet each Freedom is still needed in its own right.
4. They work as ideals and give an aspirational view of what management should achieve.
5. All three main welfare frameworks, biological functioning, naturalness and animal feelings, are present in them.
6. They frame welfare as animal outcomes rather than inputs, and at the individual level rather than the group.

Limitations.

1. They are too idealised and not practical, since an animal that never feels hunger would never show food-seeking behaviour and so would never eat.
2. They do not allow for the nuanced way an animal responds, and no animal can be totally free of all negative states at all times.
3. Read as rights rather than ideals they become problematic and do not account for the biological functioning of all organisms.
4. They give a framework but no practical method of assessing welfare and no ethical view of what is acceptable practice, so separate frameworks are needed for both.
5. The Farm Animal Welfare Council, who developed them, later criticised their focus on negative emotions and suffering, since the phrase Freedom from appears in all but one Freedom.

Conclusion. The Five Freedoms grew out of the Brambell Report of 1965 and became the world's best known welfare framework. They are broad, outcome-based and individual-centred, but idealised, and they cannot by themselves measure welfare.

Describe welfare problems that selective breeding could improve. Give undesirable effects of past breeding and the ethical considerations.

Cause. Genes often have pleiotropic effects, so one gene can influence several traits at once even when those traits appear unrelated. Two genes with different effects can also be inherited together if they lie close on the chromosome. Breeding for an economic or aesthetic trait therefore causes genetic change in other traits of welfare significance.

1. Livestock. Increasing lambs born per female has likely reduced lamb survival, and increasing the muscularity of beef calves has caused problems at parturition, called dystocia.
2. Poultry, dairy and pigs. Cardiovascular problems and lameness in fast-growing broiler chickens, skeletal weakness in high egg producing hens, poor neonatal survival in large litters of pigs, and increased lameness and mastitis in high yielding dairy cows.
3. Companion animals. Selection for short noses, small size, shorter limbs and long backs has caused welfare problems. Flat-faced dogs are prone to respiratory and thermoregulatory distress, long-backed dogs get spinal weakness and paralysis, and short-limbed dogs get arthritis and joint problems.
4. Laboratory and small populations. Laboratory species are deliberately bred to be susceptible to specific diseases. Small populations risk inbreeding, so offspring inherit multiple copies of a harmful allele, which also reduces health in zoo populations and rare breeds.

Reversing the damage. The genetic cause of sudden death syndrome in pigs, triggered by stress, was found and controlled by careful breeding. Homozygosity was the cause but had been encouraged because it gives an advantage in growth rate.

Dairy breeding traditionally targeted milk yield and protein and fat percentage, which improved milk but worsened lameness, mastitis resistance, fertility and lifespan. Most national dairy strategies now place some focus on welfare or functional traits, and in the UK the Profitable Lifetime Index puts more pressure on non-production traits, which cut veterinary costs, reduced periods of discarded milk, lengthened the cow's lifespan and raised overall profitability.

Using breeding to improve welfare. Some problems resist management change alone, such as redirected social behaviour like tail and ear biting in pigs and feather pecking and cannibalism in hens. Preventing these needs resources that give an outlet for foraging motivation, which is too costly for most intensive farmers. Extensive systems have their own version, such as neonatal mortality in sheep giving birth outdoors in unpredictable weather.

Ethical considerations.

1. Any change, especially a behavioural one, may be seen to reduce the naturalness of the animal. The counter argument is that such selection reverses past selection and makes animals more like their wild ancestors, since injurious redirected behaviours have never been observed in the wild.
2. Economic and practical barriers should not prevent the adoption of known interventions, and breeding should not be relied on as an alternative. The counter view is that consumer pressure and legislation have failed in the past, so every tool should be used.
3. It could have unintended impacts on other welfare-relevant traits we do not yet know about.
4. Selecting against the expression of a trait does not necessarily improve the animal's experience. A pig that does not tail bite may not be happier in a barren environment, and selecting against lameness by measuring difficulty in walking may simply select animals that are good at hiding pain.

Conclusion. Past breeding for production and looks created lasting welfare problems, from broiler lameness to flat-faced dogs. Breeding can now also fix such problems, but only with care for naturalness, unknown side effects and the animal's real experience.