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Form 3 Biology questions and answers on reproduction in animals
During which phase of meiosis does crossing over occur.
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Answer Text:
Prophase I
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1.
Describe the role or each of the following hormones in the human menstrual cycle (i) Oestrogen (ii) Progesterone (iii) Luteinising hormone
2.
Give a reason why it is necessary for frogs to lay many eggs
3.
Figures 1 and 2 below represent reproductive organ of plants and an animal respectively. (a) Which letters in figures 1 and 2 represents the organs that produce female gametes? Figure 1 Figure 2 (b) What is the function of the structure labeled S? (c) Name the structure labeled W (d) Which letters in figures 1 and 2 represents the structures where fertilization takes place
4.
(a) List four differences between meiosis and mitosis (b) Which sex chromosomes are found in human? Sperm cell
5.
Explain why sexual reproduction is important in organisms
6.
State three advantages of a sexual reproduction
7.
Describe the role of hormones in the human menstrual cycle
8.
The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal. a) What type of cell division takes place at Z b) Where in the body of a female does process Z occur c) On the chart, indicate the position of parents and gametes d) Name the process that leads to addition or loss of one or more chromosomes. e) State three benefits of polyploidy in plants
9.
During which phase of meiosis does crossing over occur.
10.
State two processes which occur during anaphase of mitosis.
11.
The diagram below represents human foetus in a uterus. (a) Name the part labeled S. (b) Name the types of blood vessels found in the structure labeled Q. (c) Name two features that enable the structure labeled P carry out its function. (d) State the role of the part labeled R
12.
The diagram below represents a stage during cell division (a) (i) Identify the stage of cell division (ii) Give three reasons for your answer in (a) (i) above (b) Name the structures labeled M
13.
State two disadvantages of sexual reproduction in animals
14.
State the mode of asexual reproduction in yeast
15.
State the function of amniotic fluid.
16.
The figure shows changes that take place during menstrual cycle in human (a)Name the hormone whose concentrations are represented by curves F and G (b) State the effects of the hormones named in (a) above on the lining of the uterus (c) (i) Name the hormone which is released by the pituitary gland in high concentration on the 14th day of the menstrual cycle (ii) State two functions of the hormone
17.
Explain why (a) Mammalian testes are located to hang outside the body (b) Four months after fertilization, ovaries can be removed from a human female, without terminating pregnancy.
18.
State two advantages of internal fertilization in humans
19.
What is the function of the following structures in the human reproductive organs? (a) Fallopian tube (b) Epididymis c)scrotal sac
20.
Name the gamete cells that are produced by the ovaries.
21.
Name two reproductive hormones secreted by the pituitary gland in women.
22.
The diagram below represents a human reproductive organ. (i)Explain two adaptations of the structure labeled L to its functions (ii)Explain the role of gland labeled K
23.
What name is given to a group of hormones that controls the development of secondary sexual characteristics in a human male?
24.
Name two substances that leave the foetal blood through the placenta.
25.
How is the human sperm cell structurally specialized?
26.
State two functions of the placenta in mammals
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