An example of an endospermous seed is

• A. been seed
• B. cashew nut
• C. cotton seed
• D. maize grain

The inner ear contains two main organs, namely, the

• A. eardrum and eustachian tube
• B. cochlea and semi-circular canals
• C. oval window and ossicles
• D. pinna and cochlea

The primary consumer in the food chain below is ................ Green plants → Grasshopper → Lizard → Snake → Hawk

• A. Grass hopper
• B. green plants
• C. hawk
• D. lizard

A species of seagull migrates into the region in which a crab population lives. This type of seagull has never lived in this particular environment before. The seagulls eat crabs, and begin to prey on the crab population. The smallest of the crabs are able to successfully hide under rocks and avoid being eaten by the seagulls. The largest of the crabs are too big to fit inside of the seagulls' beaks, so the seagulls learn not to try to eat them. Over time, the seagulls prey on the medium sized crabs, and only the smallest and largest members of the initial crab population survive. Which type of selection does the described situation model?

• A. Convergent selection
• B. Directional selection
• C. Random selection
• D. Disruptive selection

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 understand
• D. the technology can be applied only in developed countries

Which of the following is an example of discontinuous variation?

• A. The range in height of a pea plant from 30cm to 50cm
• B. Offsprings including two male cats and three female cats
• C. The colour of pear plants grown in the dark
• D. The adult body weight ranging from 50kg to 95kg

(a) What is sexual reproduction?

(b) State five functions of the placenta and four functions of the umbilical cord of a mammal.

(c) List four types of placentation in flowering plants.

(d) State four conditions necessary for seed germination.

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

• A. 32
• B. 16
• C. 8
• D. 4

Which of the following is true in blood transfusion?

• A. A person of blood group AB can donate blood only to another person of blood group AB
• B. Persons of blood groups A and B can donate or receive blood from each other
• C. A person of blood group AB can receive blood only from persons of blood group A or B
• D. A person of blood group O can donate only to a person of blood group O

Use the following information to answer the question below. I. Test tube containing cane sugar and water . ll. Test tube containing cane sugar and diluted acid. III. Test tube containing cane sugar and its degrading enzyme . The enzyme involved in the hydrolysis is

• A. rennin
• B. erepsin
• C. sucrase
• D. maltase