Which of the following is an excretory product of Amoeba?
- A. Urea
- B. Ammonia
- C. Uric acid
- D. Amino acid
The effect of the contraction of the muscles of the diaphram is that
- A. he volume of the thoracic cavity increases.
- B. more carbon dioxide is expelled through the nostrils
- C. the rib cage is drawn inwards
- D. the intercostal muscle becomes relaxed
Which of the following pairs of structures does not perform similar functions?
- A. Lungs and spiracles
- B. Root hair and mammalian hair
- C. Feathers and scales
- D. Contractile vacuole and kidney
Which of the following is not a product of fermentation of glucose?
- A. Energy
- B. Alcohol
- C. Lactic acid
- D. Carbon dioxide
Which part of the gill of fish is involved in gaseous exchange?
- A. Gill slits
- B. Gill bars
- C. Gill covers
- D. Gill filaments
The process by which plants convey food material to different parts of the body is called
- A. nutrition
- B. absorption
- C. circulation
- D. translocation
Which of the following is not a constituent of blood plasma?
- A. Proteins
- B. Mineral salts
- C. Water
- D. Platelets
Which of the following statements is true about blood groupings?
- A. Group AB can donate blood to all other groups
- B. Group 0 are universal recipients.
- C. Group A has A antigen in its plasma
- D. Group O has no antigen.
Which of the following groups contains a non-supporting structure in animals?
- A. Cartilage, bone and pseudopodia
- B. Pellicle, chitin and bone
- C. Humerus, ribs and cartilage
- D. Femur, pellicle and chitin
The advantages of sexual reproduction include the following except
- A. t allows the formation of new species
- B. it allows production of desirable traits
- C. it permits variation of individuals
- D. it provides means for the variation of chromosome number from generation to generation.
Display is a phenomenon which occurs when an animal is
- A. ready for mating
- B. fighting to defend itself
- C. approaching puberty
- D. chasing away an intruder
Which bf the following structures are visible in the cell of a plant during mitosis?
- A. Centrioles, chromatids and nucleolus
- B. Homologous chromosomes, nuclear membrane and spindle fibres
- C. cell wall, centrioles and chromatids
- D. Chromosomes, nuclear membrane and centromere
A red blood cell haemolyses when placed in a hypotonic solution because
- A. it contains haemoglobin
- B. the cytoplasm is less dense
- C. the cell lacks a wall
- D. its pigment has a high affinity for water
Which of the following phenomena affects plants growth in an alkaline soil?
- A. Excessive plasmolysis
- B. Excessive transpiration
- C. Excessive sunlight
- D. Poor drainage
A major reason why the red blood cells can survive in the blood is that the
- A. blood plasma and the red blood cells are isotonic
- B. red blood cells are hypotonic to the plasma
- C. the red blood cells are hypertonic to the blood plasma
- D. the red blood cells receive digested nutrients
A piece of yam weighing 1.0 gm was put into some salt solution. After 3 hours, it was removed and weighed.
The recorded weight was 1.2gms. This simple experiment demonstrates that the
- A. salt solution is more concentrated than the cell sap of the yam.
- B. cell sap of the yam is more concentrated than the salt - solution
- C. salt solution has the same concentration as the cell sap of the yam.
- D. the yam lost some water molecules to the salt solution.
Carbohydrates are stored in the animal cell in the form of
- A. starch
- B. glycogen
- C. plastid
- D. maltose
The major function of the cell membrane is that it
- A. delimits the cytoplasm
- B. synthesizes protein
- C. breaks down worn-out organelles
- D. is the site for photosynthesis
The structure labelled V is the
- A. cell wall
- B. nucleus
- C. endoplasmic reticullum
- D. mitochondrion
Which of the following is a tissue?
- A. Volvox
- B. Chlamydomonas
- C. Epidermis
- D. Paramecium