What name is given to a group of hormones that controls the development of secondary sexual characteristics in a human male?(Answered) 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.(Answered) Name two reproductive hormones secreted by the pituitary gland in women.(Answered) Name the gamete cells that are produced by the ovaries.(Answered) What is the function of the following structures in the human reproductive organs?
(a) Fallopian tube.
(b)Epididymis.
(c) Scrotal sac.(Answered) State two advantages of internal fertilization in humans.(Answered) 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.(Answered) State the function of amniotic fluid.(Answered) State the mode of asexual reproduction in yeast.(Answered) State two disadvantages of sexual reproduction in animals.(Answered) 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.(Answered) 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.(Answered) State two processes which occur during anaphase of mitosis.(Answered) During which phase of meiosis does crossing over occur.(Answered) State three benefits of polyploidy in plants to a farmer.(Answered) Name the process that leads to addition or loss of one or more chromosomes.(Answered) 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.(Answered) Describe the role of hormones in the human menstrual cycle.(Answered) State three advantages of asexual reproduction.(Answered) Explain why sexual reproduction is important in organisms.(Answered) List four differences between meiosis and mitosis.(Answered) Which sex chromosomes are found in human?(Answered) 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.
(e)Which letter in figure (Answered) Give a reason why it is necessary for frogs to lay many eggs.(Answered) Describe the role or each of the following hormones in the human menstrual cycle
(i) Oestrogen
(ii) Progesterone
(iii)Luteinising hormone(Answered) The diagram below represents the pathways of water from the soil into the plant.
Explain how water from the soil reaches the structure labeled L.(Answered) State two ways in which plants with weak stems obtain mechanical support.(Answered) State three ways in which support is brought about in a leaf.(Answered) State four characteristics of apical meristem cells.(Answered) Name a support tissue in plants thickened with cellulose.(Answered) What happens when a wilting young plants is well watered.(Answered) Name a support tissue in plants that is not thickened with lignin(Answered) Name two tissues in plants that provide mechanical support.(Answered) How is support attained herbaceous plants?
(Answered) Name two tissues in plants which are thickened with lignin(Answered) How are the xylem vessels adapted for support?(Answered) State three ways by which plants compensate for lack of ability to move from one place to another.(Answered) What makes young herbaceous plant remain upright?(Answered) State one characteristic of muscles responsible for each of the following
(a) Peristaltic movement
(b) Movement of limbs(Answered) State how each of the following features enhance efficient movement of fish in water:
(i) Scale
(ii) Body shape(Answered) Name the bones that articulate to form a ball and socket joint at hip.(Answered) State a characteristic that is common to all cervical vertebrae(Answered) (a) Name two types of involuntary muscles in mammals
(b) State the location of each of the muscles named in (a) above.(Answered) Name the type of skeleton that makes up each of the following animals
(a) Locust
(b) Bird(Answered) Distinguish between a tendon and a ligament(Answered) Which type of mammalian muscles is voluntary(Answered) State two functions of intervertebral discs in mammalian skeleton(Answered) State two functions of the pelvic girdle in mammals.(Answered) The diagram below shows how the iris and pupil of a human eye appear under different conditions.
(a) Name the structures labeled X and Y
(b)(i)State the condition that leads to the change in appearance shown in the diagram labeled B
(ii) Describe the changes that lead to the appearance of the iris and pupil as shown in the diagram labeled B
(iii) What is the significance of the changes described (Answered) The diagram below illustrates the arrangement of bones and muscles in the human arm.
(i) Name the bones labeled K and L
(ii) Explain how upward movement of the lower arm is brought about by bones and muscles shown in the diagram above.(Answered) The diagram below represents features of a joint in a mammal .
(a) Name the part labeled A
(b) State the function of the part labeled B(Answered) The diagram below represents part of the human skeleton.
(a) Name the part labeled P
(b) (i) Name the bone that articulates with the part labeled Q
(ii) What type of joint is formed between the part labeled Q and the bone named in (b) (i) above.(Answered) Give three functions of pectoral and pelvic fins in a fish.(Answered) The diagram below represents a bone from a mammal
(a) Name the bone
(b) Name the:
(i) Bone which articulate with the bone named in (a) above at the cavity labeled K
(ii) Joint formed by the two bones.
(c) State the function of the part labeled J.
(Answered) Why is movement necessary in animals.(Answered) Give three reasons in each case why support is necessary in
(i) Plants
(ii) Animals(Answered) The diagram below shows two fused bones of a mammal.
(a) Identify the fused bone
(b) Name
(i) Bone that articulates at the point labeled F
(ii) The hole labeled G(Answered) The diagram below represents a tissue obtained from an animal
(a) Identify the tissue
b)State the function of the tissue named above(Answered) State two advantages of having an exoskeleton(Answered) State the functions of synovial fluid(Answered) State the difference between ball and socket and hinge joint.(Answered) Name the three type of muscles found in mammals and give an example each(Answered) State the characteristic that is common to all cervical vertebrae(Answered) The diagram below represents bones at a joint found in the hind limb of a mammal.
(a) Name the bones labeled X, Y and Z
(b) (i) Name the substance found in the place labeled W
(ii) State the function of the substance named in (b)(i) above.
(c) Name the structure that joins the bone together at the joint.
(d) State the difference between ball and socket joint and the one illustrated in the diagram (Answered) (a) Name the cartilage found between the bones for the vertebral column.
(b) State the function of the cartilage named in (a) above(Answered) A bone obtained from a mammal is represented by the diagram below.
(a) Name the bone
(b) Which born articulate with the bone shown in the diagram at the notch?
(Answered) Name three types of skeletons found in multicellular animals(Answered) Which type of joint is found at the articulation of
(a) Pelvic girdle and femur
(b) Humerus and ulna(Answered) Give a reason why lumbar vertebrae have long and broad transverse process.(Answered) The diagram below represents a mammalian bone.
a)Name the bone
(b) Name the type of the joint formed by the bone at its interior end with the adjacent bone.(Answered) State three structural differences between biceps and muscles of the gut.(Answered) Explain the evolutionary basis for the ever changing drugs for malaria treatment.(Answered) State the benefits of mutation in living organisms.(Answered) Name the evidence of organic evolution exhibited by occurrence of similar amino acid molecules in a range of organisms.(Answered) Explain why fossil records as evidence of organic evolution are usually incomplete?(Answered) What does the term evolution mean?(Answered) Give two illustrations of analogous structures in mammals.(Answered) Define the term analogous structures.(Answered) The diagrams below illustrates some forms of beaks in birds.
(a) Which diagram represents the beak from which the others are likely to have evolved?
b)Explain your answer in (a) above.(Answered) State three methods of fossil formation. (Answered) State two major advantages evolution has given human over most of the other animals.(Answered) State the significance of the evolution on the parietal bone in the chimpanzee and human
skulls.(Answered) During a lesson, students observed the structure of bat, act and human forelimbs to determine their evolutionary relationship.
(a)State the name given to the structure of the limbs observed by the students.
(b)Name the type of evolution illustrated by the structure of the limbs observed.
(c)What evidence of evolution is illustrated by the limbs?
(d)State the significance of the type of evolution (Answered) Why are some bacteria able to resist the effect of antibiotics.(Answered) Name two vestigial structures in human beings.(Answered) Explain the role of continental drift in evolution?(Answered) Explain the theory of evolution by natural selection.
(Answered) State the evidence of evolution based on
(i) Cell organelles
(ii) Fossils(Answered) State the theories of evolution proposed by the following scientists.
a)Charles Darwin ……….
b)Jean-Baptise de Lamarck ………….
(Answered) State the importance of divergent evolution to organisms.(Answered) Explain how comparative embryology is an evidence for organic evolution(Answered) State two limitations of fossils as an evidence of evolution.(Answered) What is meant by convergent evolution?(Answered) Why is Lamarck’s theory not acceptable?(Answered) State two ideas proposed by Lamarck’s in his theory of evolution.(Answered) Explain why certain drugs become ineffective in curing a disease after many years of use.(Answered) Give an example of a vestigial structure in human.(Answered) What is meant by vestigial structures?(Answered) Give a reason why organisms become resistant to drugs.(Answered) What is adaptive radiation?(Answered)