Products of sexual reproduction - Jamb Biology Past Questions and Answers

Question 1:

• JAMB 2019

A plant which grows on another plant without apparent harm to the host plant is called

A. An epiphyte
B. A saprophyte
C. A parasite
D. A predator
E. A hermaphrodite

Question 2:

• JAMB 1978

The following events take place during conjugation in spirogyra 1. The protoplasm of each of the conjugating cell separate from the cell wall to form a Gamete; the gamete of one filament passes through the conjugation tube to meet the gamete of the other filament 2. The zygote soon become surrounded by thick brown wall to become zygospore which burst after a short rest and germinate to produce a new filament 3. The nuclei of the gametes fuse to form a zygote 4. The protuberance meet and where they touch the cell-wall disappear so that a conjugation tube joining the two cell is formed 5. protuberance appear on the wall of the cell of two filament of spirogyra lying side by side opposite one another. Now what is the correct sequence in which the above sequence occur?

A. 1,2,3,4,5
B. 1,2,4,5,3
C. 3,4,5,2,1
D. 5,4,1,3,2
E. 5,4,3,1,2

Question 3:

• JAMB 1979

Identical twins are produced under one of the following conditions

A. Two oval fertilized at the same time by two sperm
B. One ovum ferilized divides to give two embryos
C. One ovum fertilized, twins formed shortly before birth
D. Two ova fertilized by one sperm
E. One ovum fertilized by two sperm

Question 4:

• JAMB 1982

In man, identical twins occur when

A. An ovum is fertilized by a sperm and then divide into two, each forming a separate embryo
B. An ovum fertilized by two sperms and then divides into two, each forming an embryo
C. Two ova are fertilized at the same tine each forming an embryo
D. Two ova are fertilized by a single sperm each forming an embryo after fertilization
E. One ovum first divides into two and each half is fertilized by a sperm before developing into an embryo