A spirogyra cell placed was placed in solution X after 1 minute the cell has been plasmolysed, solution X was
- A. Tap water
- B. a very strong sugar solution
- C. a weak sugar solution
- D. a very weak salt solution
- E. distilled water
The mammalian stomach can carry out a number of processes except
- A. absorption of glucose
- B. secretion of hydrochloric acid
- C. secretion gastric juice
- D. churning of food
- E. production of trypsin
a potometer was used to compare the rate of loss of the same volume of water from a plant under different environmental conditions as under a fan, at the sea shore, under the sun, in the airy laboratory and in cupboard. What time was likely to have been obtained in a cupboard?
- A. 15 secs
- B. 30secs
- C. 25secs
- D. 20secs
- E. 28secs
which of these elements in plants is required in small quantities only
- A. Boron
- B. Nitrogen
- C. Phosphorus
- D. Magnesium
- E. Potassium
Which of these is not a function of the mammalian skin/
- A. Protection against bacteria infection
- B. Excretion of waste and water
- C. Production of vitamin d when exposed to sun light
- D. production of pigments to reduce temperature
- E. Regulation of body temperature
Which of these is not a part of the feather of a bird?
- A. Wing
- B. aftershaft
- C. Inferior umblilicus
- D. Vane
- E. Barbule
Which of these is not associated with the movement of the toad, reptile or bird?
- A. Hopping
- B. Bopping
- C. Flapping
- D. Gliding
- E. Pecking
Which of these is not associated with tadpole stages of toad or frog
- A. V-shaped gland
- B. operculum
- C. external gills
- D. jelly
- E. shell
The feature that distinguish the toad or frog from the fish is the absence of
- A. scales
- B. lungs
- C. paired appendages
- D. a tail
- E. skin glands
Rhizopus (or mucor)obtain its food from dead organic matter extracellularly. It is said to be
- A. a facultative parasite
- B. saprophyte
- C. an obligate parasite
- D. a commensal
- E. an autotroph
Which of these is not true of the insect? The possession of
- A. two pairs of antennae
- B. jointed appendages
- C. exoskeleton
- D. three pairs of legs
- E. segmented body
The neck region of the tape worm, (taenia) is responsible for the
- A. production of egg
- B. storage of egg
- C. formation of new segment
- D. development of the suckers
- E. fragmentaion of the body segment
At fertilization
- A. one chromosome from the male joins another from the female
- B. one gene from the male combines with another from the female
- C. the male nucleus fuses with the female nucleus
- D. one set of chromosome combines with another set from the female
- E. one cell from the male fuses with another from the female
A potometer with a leafy shoot weighed 18.9g initially and weighed 17.9g after one hour. From this it follow that
- A. the shoot absorbed 1g of water per hour
- B. 1g of water per hour evaporates from the potometer
- C. the shoot lost 1g of water per hour
- D. the potometer water receded at the rate of 1g per hour
- E. the shoot was respiring and lost weight at rate of 1g per hour
The study of organism and the environment of an abandoned farmland is the ecology of?
- A. a community
- B. a population
- C. a specie
- D. a habitat
- E. an ecosystem
The hormone which tones up the muscles of a person in time of danger is from the
- A. thyroid gland
- B. pancreas
- C. adrenal gland
- D. liver
- E. spleen
In which of the following groups of organisms do all the members have asexual method of reproduction?
- A. A geen filament algae, a flowering plant and a bird
- B. A toad (or frog) , ameoba and mucor ( penicillium)
- C. A flowering plant, tape worm (or ascaris) and a green filamentous algae
- D. Mucor (or penicillium), a bird and a toad (or frog)
- E. Ameoba, mucor (or penicillium ) and a green filamentous algae
In the life history of schistosoma (Bilharzia), one of the following is intermediate host
- A. man
- B. snail
- C. mosquito larva
- D. crayfish
- E. fish
Nitrifying bacteria keep the soil fertile by
- A. converting nitrate to nitrogen
- B. converting ammonium salt to nitrate
- C. converting atmospheric nitrogen to plant nitrogen
- D. converting nitrate to nitrous oxide
- E. converting atmospheric nitrogen to nitrates
Which of the following is a characteristic of animal cell?
- A. Presence of chloroplast
- B. possession of cellulose cell-wall
- C. absence of large vacuoles
- D. presence of large vacuoles
- E. presence of chromosome
The following events take place during conjugation in spirogyra 1. The protoplasm of each of the conjugating cell separate from the cell wall to form a Gamete; the gamete of one filament passes through the conjugation tube to meet the gamete of the other filament 2. The zygote soon become surrounded by thick brown wall to become zygospore which burst after a short rest and germinate to produce a new filament 3. The nuclei of the gametes fuse to form a zygote 4. The protuberance meet and where they touch the cell-wall disappear so that a conjugation tube joining the two cell is formed 5. protuberance appear on the wall of the cell of two filament of spirogyra lying side by side opposite one another. Now what is the correct sequence in which the above sequence occur?
- A. 1,2,3,4,5
- B. 1,2,4,5,3
- C. 3,4,5,2,1
- D. 5,4,1,3,2
- E. 5,4,3,1,2