The product of excretion common to the mammalian kidney, lung and skin is

• A. mineral salt
• B. carbon (IV) oxide
• C. water
• D. urea

Which of the following does not contribute to evolution?

• A. A constant environment
• B. Mutation
• C. Migration
• D. Genetic drift

Which of the following is not a characteristics feature of a wind dispersed fruit?

• A. Lightweight
• B. winged apparatus
• C. Flossy structure
• D. Buoyancy

In which of the following parts of a cell is the chromosome found

• A. Nucleus
• B. Golgi body
• C. Cytoplasm
• D. Cell membrane

Xerophytes have the following characteristics aimed at conserving water except

• A. thick cuticle
• B. broad leaf surfaces
• C. sunken stomata
• D. waxy cuticle

In million's test, when the reagent is added to a protein food item, a white precipitate is produced which turns

• A. blue on heating
• B. yellow on heating
• C. green on heating
• D. red on heating

Which of the following statements best describes a test cross?

• A. to determine the genotype of an individual whose phenotype is to be known
• B. to determine the phenotype of an individual whose genotype is known
• C. between the progeny of parents to ascertain external expressions
• D. between two homozygous recessive individuals to confirm the genotypes

Which of the following statements about the development of the foetus is not correct?

• A. The circulatory system of the foetus is directly connected to the maternal blood vessels
• B. The foetus depends on the mothers blood for its food and oxygen
• C. The foetus is surrounded by a water sac
• D. Food and oxygen are carried across the placenta to the embryo

In snails, the hard calcareous shells are secreted by the

• A. radula
• B. ctenidium
• C. pneumostome
• D. mantle

The hydra has two body layers of cells called

• A. ectodermis and enteron
• B. ectodemt and endoderm
• C. endodermis and dermis
• D. epidermis and dermis