In the reproduction of mosses, water is essential because

A. they live in moist habitats

B. they cannnot reproduce without water

C. the male ganetes must swim to fertilize the ovum

D. they produce spores

In tapeworm, the two structure that run throughout the length of the body are the

A. nerve cord and excretory duct

B. sperm duct and the nerve cord

C. genital pore and the excretory duct

D. sperm duct and the genital pore

Which of the following is not a characteristics of snail?

A. Bilateral symmetry

B. Chitinous exoskeleton

C. Muscular foot

D. soft unsegmented body in mantle

In the life history of butterfly, destruction of crops is caused by the

A. maggot

B. nymph

C. caterpillar

D. pupa

The correct sequence of tissues in the anatomy of a young dicotyledonous stem from the inside to the outside is

A. pith, phloem, cambium, xylem, parenchyma, collenchyma and epidermis

B. xylem, phloem, cambium, cortex, endodermis, collenchyma and epidermis

C. pith, xylem, cambium, phloem, collenchyma, parenchyma and epidermis

D. phhloem, xylem, cambium, cortex, endodermis, collenchyma and epidermis

Secondary thickening is initiated in a dicotyledonous stem by the

A. xylem parenchyma

B. secondary phloem

C. endodermis

D. cambium

In demonstrating the importance of mineral elements in plants, the culture bottle must be darkened to

A. prevent alga growth in culture solution

B. allow root growth

C. prevent breakdown of mineral elements

D. prevent photosynthesis in the root

The vitamin which is important in the formation of the retina pigment is

A. vitamin A

B. vitamin B

C. vitamin C

D. vitamin D

Which of the following lists of organs is directly involved in nutrition?

A. Oesophagus, bronchus, stomach, pancreas and anus

B. spleen, pharynx, duodenum, jejunum and rectum

C. Teeth, oesophagus, ileum lungs and large intestine

D. Salivary gland, liver, stomach, villi and colon

In the standard experiment to show that oxygen is given off during photosynthesis, sodium bicarbonate is used to

A. neutralize the acid in water

B. supply mineral salt to water plant

C. supply carbondioxide for photosynthesis

D. kill micro-organisms in water