[3 Mark Questions]

Question 13 Marks

i. Write the correct sequence of steps followed during journey of oxygen rich blood from lungs to various organs of human body.
ii. What happens when the system of blood vessels develop a leak?

Answer

i. The correct sequence is blood flow from the Lungs $\xrightarrow[\text { vein }]{\text { Pulmonary }}$ Left sides of the heart $\rightarrow$ Ventricle $\rightarrow$ Aorta $\rightarrow$ Body organs

ii. The leaked blood flows into surrounding tissues leading to accumulation of blood. This condition is known as hematoma.

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Question 23 Marks

Name the plant Mendel used for his experiment. What type of progeny was obtained by Mendel in $F_{1}$ and $F_{2}$ generations when he crossed the tall and short plants? Write the ratio he obtained in $\mathrm{F}_{2}$ generation plants.

Answer

i. Plant used by Mendal is Garden Pea Plant (Pisum sativum).
ii. $\mathrm{F}_{1}$ - All tall; $\mathrm{F}_{2}$ - Tall and short
iii.The ratio in $\mathrm{F}_{1}$ progeny is 3:1.

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Science [3 Mark Questions]

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