181.Two plants with red flowers were back crossed, which of the following results indicates that the plants are heterozygous red flower, where red flowers are dominants?
- A. 75% red and 25% white
- B. 50% red and 50% white
- C. 100% white
- D. 100% red
182.Genetically modified food products have not become universally accepted because
- A. They are not tasty as others produced by conventional means
- B. They are usually costlier than others produced by conventional means
- C. Their effects on human consumers is not yet fully understood
- D. The technology can be applied only in developed countries
183.Which of these animals is not metamerically segmented
- A. Tapeworm
- B. Earthworm
- C. Centipede
- D. Shark
184.The sterile individuals in the honey bee are known as
- A. Drone
- B. Queens
- C. Workers
- D. None of these
185.Which of the following is used mainly for balancing in fish?
- A. The caudal fin
- B. The pectoral fin
- C. The anal fin
- D. The dorsal fin
186.Octopus is popularly known as____fish
- A. Devil
- B. Jelly
- C. Cray
- D. Shark
187.The sexual reproductive units produced by mature individuals or sexually reproducing species of organism is called
- A. Sperms
- B. Ova
- C. Zygotes
- D. Gametes
188.Which of these does not have respiratory and circulatory systems
- A. Annelids
- B. Nematodes
- C. Insects
- D. Molluscs
189.Spear grass has underground structure called
- A. Bulbs
- B. Corms
- C. Rhizomes
- D. Tap roots
190.Maize is best stored against insect attack
- A. On raised platform
- B. In fumigated silos
- C. While still on the cob
- D. In humid metal tanks
191.Circulation of blood to all parts of the body except the lungs is through
- A. The pulmonary artery
- B. Systematic circulation
- C. The lymphatic system
- D. Pulmonary circulation
192.Manufactured food in plants is transported through the
- A. Xylem
- B. Phloem
- C. Cambium
- D. Cortex
193.The genetic make-up of an organism is called
- A. Genotype
- B. Phenotype
- C. Variation
- D. Gene
194.A sudden change in a gene or genes is called
- A. Fertilization
- B. Variation
- C. Mutation
- D. Heredity
195.Which of the following statements is true of blood groups and blood transfusion?
- A. Group A can donate to group A only
- B. Group B can donate to group B only
- C. Group O is the universal recipient
- D. Group AB is the universal recipient.
196.A tall plant crossed with a dwarf one produces off spring of which half are tall and half are dwarf. What are the genotypes of the parents?
- A. Tt, tt
- B. TT, tt
- C. Tt, Tt
- D. TT,TT
197.Both recessive and dominant characters are found
- A. at the same locus of a homologous chromosome
- B. at different loci of homologous chromosome
- C. on different chromosomes in the cell
- D. on the same chromatid in a chromosome.
198.Which of the following is likely to encourage inbreeding in plants
- A. monoecious
- B. dioecious
- C. hermaphrodite
- D. protandrous.
199.The probability of a baby being a boy or a girl depends on the contribution of the
- A. mother’s sex cell
- B. mother’s X chromosome
- C. father’s sex cell
- D. father’s somatic chromosome.
200.The ability of an organism to live successfully in an environment is known as
- A. succession
- B. resistance
- C. adaptation
- D. competition.