IGCSE Biology Paper-2: Specimen Questions with Answers 112 - 113 of 203

Question 112

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Question

MCQ▾

Which one of the following is a fruit?

Choices

Choice (4)

a.

Radish

b.

Lady’s finger

c.

Ginger

d.

Sweet potato

Answer

b.

Explanation

Modifications of Roots:

  • Fusiform: It is thickest at middle and spindle shaped. Ex: Radish.

  • Tuberous root: The swollen roots do not assume a definite shaped, they occur singly Ex: Sweet potato or Ipomoea batata.

Underground stems:

  • They lie below the surface of the soil and they store food and take part in perennation. They are of following types -

  • Rhizome: Horizontal underground stem bears nodes and internodes.

  • Abelmoschus esculentus L is commonly known as woman’s fingers, bhindi, okra or gumbo, is a flowering plant belongs to family malvaceae. The geographical origin of okra is disputed, with supporters of South Asian, Ethiopian, and West African origins. The plant is cultivated in tropical, subtropical, and warm temperate regions around the world. The species is an annual or perennial, growing to 2 m tall. Okra is a popular health food due to its high fiber, vitamin C, and folate content.

Question 113

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Question

MCQ▾

Which substances are dissolved in human blood plasma?

Choices

Choice (4)

a.

Carbon dioxide, haemoglobin, and glucose

b.

Carbon dioxide and haemoglobin

c.

Oxygen and starch

d.

Carbon dioxide and glucose

Answer

d.

Explanation

Plasma

  • 55 % of the blood.

  • It consists of proteins, of salts, digestive and excretory products etc. , and 90 % water.

  • The proteins mainly include albumin, globulin, and Fibrinogen.

    • Albumin is the maximum protein in the plasma but has minimum molecular weight. It maintains colloidal osmotic pressure of the blood.

    • Globulin protein can be or type. It makes 2 to 3 % of plasma proteins. The and -globulin bind with the hormones to transport them. The γ-globulins form antibodies.

    • Fibrinogen is about and helps in blood clotting.

  • Remaining of the blood plasma contains salts, hormones, digestive products, like amino acids, fatty acids, glycerol etc. , and excretory products like Urea, Uric Acid, Hippuric acid etc. It also contains bilirubin (bile pigment) which imparts yellow colour to the plasma. Following are the normal values of some important components of blood plasma.

    • Glucose - mg per 100 ml.

    • Cholesterol - mg per 100 ml.

    • Bilirubin - mg per 100 ml.

    • Urea - 20 - 30 mg per 100 ml