JAMB Biology 1990 past questions

Viruses are considered to be living organisms because they

Which of the following characteristics is common to Amoeba and Paramecium?

The structure labelled 5 is used for

Hydra removes undigested food by

Angiosperms and gymnosperms belong to the plant group known as

Which of the following groups of invertebrates reproduces by budding

The algae, bryophytes and pteriodophytes are similar in that they

The spores of ferns are dispersed by

In bryophytes, sex organs are produced in the

To facilitate gaseous exchange, breathing roots have

The part labelled 3 is the

Which of the following animals has homodont dentition?

In which of the following does external fertilization take place?

In the tapeworm, the suckers on the scolex are used for

The nephridia in the earthworm form part of the

Which of the following diseases is rarely spread by a housefly?

Which of the following cells is thin-walled and living at maturity?

The mode of nutrition in which digestion is extracelluar is

The first step in the process of photosynthesis is the

Which of the following food substances will produce a brick-red colour when warmed with Benedicts's solution

The organ which secretes digestive enzymes as well as hormone is the

The villus in the small intestine is significant because it

If a ring of bark and phloem is removed from a stem, the

Transpiration can be measured with a

Excretory products responsible for the red, purple and blue colours of flowers are called

Etiolation is caused by the influence of

Muscles are indirectly attached to bones by means of

During mammalian embryo development, large amount of oestrogen and progesterone are produced in the

The type of placentation shown in the figure above is

Fruits which develop without fertilization are described as

The elephant grass is propagated vegetatively by means of

In a reflex action, impulse flows from

The part of the ear that is concerned with balance is the

In an organism where the 2nd number of chromosomes is 16, the number of chromosomes in each gamete will be

What would be the result of the first filial generation (F1) and the second filial generation (F2) of a mono- hydrid cross between pure line normal-winged Disophila? flies and pure line short- winged flies of the gene for the normal wing is dominant?

What stage during cell division is represented in the figure above

An individual in the AB blood group is a universal recipient for blood conation because

Haemophilia results from the mutation of the genes

In a savanna ecosystem, the abiotic factors include

Which organism is an omnivore?

Which of the organims will have the lowest population in an ecosystem?

The salinity of a brackish environment.

Physiological adaptation to very dry condition in animals is called

Which set of diseases is spread mainly by insect vectors?

Most irrigated lands often become unproductive in later years because of

Farmers practices crop rotation because it

An acidic soil can be improved upon by

What do bacteria in root nodules derive from the host plant?

Which ecological factor exerts the greatest influence on the structure of the profiles?

Free nitrogen is released to the atmosphere by