IGCSE Biology Paper-1: Specimen Questions with Answers 206 - 207 of 208

Question 206

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Question

MCQ▾

The diagram shows a potato tuber.

Tuber Potato

Tuber Potato

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Which of the following statement is correct?

Choices

Choice (4)
a.it is a storage root
b.it is a storage shoot
c.it is a modified root
d.it is modified rhizome

Answer

b.

Explanation

  • Underground stems: Different types of underground stems like tuber, rhizome, bulb, and corm can take part in vegetative propagation. A portion of underground stem bearing bud forms a new plant.
  • Tuber: It is terminal portion of underground stem branch which is swollen on account of accumulation of food. e. g. , Potato, Artichoke
  • Rhizome: It grows or horizontally under soil surface. It is well branched and bears nodes, intemodes, buds and scale leaves. e. g. , Banana, Turmeric, Aspidium, Adiantum
Tuber Potato

Tuber Potato

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Question 207

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Question

MCQ▾

The diagram is showing a section through a kidney.

Section Through the Kidney

Section through the Kidney

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What does P, Q, R and S represent in the diagram?

Choices

Choice (4)
a.P-pelvis, Q-medulla, R-cortex, S-ureter
b.P-pelvis, Q-cortex, R-medulla, S-ureter
c.P-medulla, Q-cortex, R-pelvis, S-ureter
d.P-cortex, Q-pelvis, R-medulla, S-ureter

Answer

d.

Explanation

Section Through the Kidney

Section through the Kidney

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Kidneys

  • The kidneys are dark-red, bean-shaped organs about 10 - 12 cm long, 5 - 7 cm wide and 2 - 3 cm thick, Each weight about 120 - 170 gm.
  • In man left kidney occurs at a slightly higher level than the right one, because right side has prominent right liver lobe.
  • The center of concave inner surface is called as hilum or hilus which gives out a ureter. From this hilus surface the renal artery enters the kidney, the renal vein comes out and the renal nerves enter the kidney.
  • The kidneys are metanephric in mammals. The kidney is divisible into two parts outer-cortex and inner-medulla.
  • Renal pyramids or medullary pyramids: The medulla is subdivided into 8 to 18 conical masses – the renal pyramid, each having broad base towards the cortex and a narrow end called renal papilla towards the pelvis.