Reproduction, Development & Growth

Which of the following statements regarding spermatogenesis and oogenesis is true?

• Meiosis in oogenesis produces one mature egg from one primary oocyte.

• Meiosis in spermatogenesis produces two cells from one primary spermatocyte.

• Spermatogenesis begins at birth.

• Oogenesis begins at puberty.

Select the germ layer that produces the skeletal system later on in mammals from the embryo.

• Mesoderm

• Ectoderm

• Endoderm

• Ectoderm and endoderm

Select from the following graphs, the one that accurately shows the growth of an insect that does complete metamorphosis from the time it hatches till the time it becomes an adult

• 
• 
• 
• 

Which among the following processes involves meiosis?

I Spermatogenesis

II Oogenesis

III Fertilisation

IV Blastulation

• III only

• I and II

• III and IV

• I, II and III

Seeds of many plants cease (stop) developing when in unfavourable conditions. They can survive for many years in this state which is called

• germination.

• dormancy.

• geotropism.

• hibernation.

Identify the organ in an insect that produces the juvenile hormone

• Corpus allatum gland

• Corpus cardiacum gland

• Neurosecretory cells

• Prothoracic gland

The table shows types of hormones and their effects. Match the effects to the hormones correctly

• (f) I (g) II (h) III (i) IV

• (f) I (g) III (h) IV (i) II

• (f) II (g) III (h) I (i) IV

• (f) IV (g) I (h) II (i) III

Table shows three experiments on ecdysis that was conducted on a bloodsucking insect, Rhodinus sp. Which of the following statement is an untrue conclusion of the above experiment?

• Ecdysis in insects is regulated by a substance that can diffuse

• The substance that stimulates ecdysis is transported by haemolymph

• The hormone for ecdysis is produced a few days after the insect sucks blood

• The swelling of the alimentary canal upon sucking of blood stimulates the brain to trigger ecdysis

The diagram shows stages of oogenesis. What is stage W?

• Mitosis

• Meiosis I

• Meiosis II

• Differentiation

The diagram shows a simplified scheme of interaction of five types of hormone I, II, III, IV and V from formation of gamete to parturition of foetus in mammals. Which of the following has correctly matched the five hormones?

• Follicle stimulating hormon (I)

  Estrogen (II)

  Luteinising hormone (III)

  Progesterone (IV)

  Oxytocin (V)

• Follicle stimulating hormon (I)

  Estrogen (III)

  Luteinising hormone (IV)

  Progesterone (V)

  Oxytocin (II)

• Follicle stimulating hormon (II)

  Estrogen (I)

  Luteinising hormone (III)

  Progesterone (IV)

  Oxytocin (V)

• Follicle stimulating hormon (II)

  Estrogen (III)

  Luteinising hormone (V)

  Progesterone (I)

  Oxytocin (IV)