Biology_2016_STPM term 2_Objectives

Which statements are true about human myoglobin?

I. Myoglobin releases oxygen easily to muscle cells

II. Myoglobin retains its oxygen in resting cells.

III. Myoglobin only release its oxygen when the supply of oxyhaemoglobin is insufficient.

IV. Myoglobin has a low affinity towards carbon dioxide.

• I and II

• I and IV

• II and III

• III and IV

Which part of the brain controls the breathing rate?

• Thalamus

• Cerebellum

• Hypothalamus

• Medulla oblongata

Which statement is true about Casparian strip in plant roots?

• It increases the surface area for absorption of minerals.

• It is situated at the walls between endodermal and cortex cells.

• It provides energy for active transport of minerals into the stele from the cortex.

• It ensures that water and dissolved substances pass through cells before entering the stele.

• P : Aorta

  Q : Pulmonary vein

  R : Vena cava

• P : Pulmonary vein

  Q : Vena cava

  R : Aorta

• P : Vena cava

  Q : Pulmonary vein

  R : Aorta

• P : Aorta

  Q : Vena cava

  R : Pulmonary vein

Which statement are true about X?

I. X is ethylene, which causes abscission of coffee beans.

II. The effects of X could be countered by auxin.

III. X is abscisic acid, which promotes senescence of leaves.

IV. X is a type of gas with CH₂ = CH₂ formula, which defoliates leaves and coffee beans.

• I and III

• I and IV

• II and III

• II and IV

What would happen to a plant several weeks after its apical bud is removed?

• The stem of the plant increases in length.

• The lateral buds grow into branches.

• A new apical bud forms.

• The plant undergoes lateral bud dominancy.

Which are true about phytochromes?

I. Red pigment acts as a photoreceptor.

II. Regulates the absorption of light.

III. Converted to active form by red light.

IV. Regulates flowering in some plants.

• I and II

• I and III

• II and IV

• III and IV

Which are true about gastrula?

I. The present of three germ layers.

II. A hollow fluid-filled ball of cells.

III. The blastocoel is replaced by archenteron.

IV. The presence of dorsal neural tube to the notochord.

• I and III

• I and IV

• II and III

• II and IV

Which is true of the cells found in the anther and carpel of lily flower?

• Diploid : Pollen mother cells, embryo sac mother cells and fused polar-nuclei

  Haploid : Pollen grains, embryo sac, male and female gametes.

• Diploid : Pollen grains, embryo sac, male and female gametes.

  Haploid : Pollen mother cells, embryo sac mother cells and fused polar-nuclei

• Diploid : Pollen mother cells, embryo sac mother cells and male and female gametes.

  Haploid : Pollen grains, embryo sac and fused polar-nuclei

• Diploid : Pollen grains, embryo sac and fused polar-nuclei

  Haploid : Pollen mother cells, embryo sac mother cells, male and female gametes.

Which statement are not true about diabetes mellitus?

I. The secretion of ADH is low.

II. Insulin receptor is not functional.

III. β-cells fail to secrete insulin.

IV. Causes excessive urination.

• I and II

• I and IV

• II and III

• III and IV