[3 Mark Questions]

Question 13 Marks

How to destarch the leaves for an experiment to show that sunlight is necessary for photosynthesis?

Answer

Destarching occurs when part of a plant is "deprived of starch, as by translocation". It is also the process of eliminating starch reserves in a plant for experiments concerning photosynthesis. This is done by leaving the plant in a dark place for a long period of time.

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Question 23 Marks

In pea plant, round seed is dominant over the wrinkled. If a cross is carried out between these two plants, give answer to the following questions.
i. Mention the genes for the traits of parents.
ii. State the trait of $\mathrm{F}_{1}$ hybrids.
iii. Write the ratio of $\mathrm{F}_{2}$ progeny obtained from this cross. What is the name of the cross?

Answer

i. RR for homozygous pure round. And rr for homozygous pure wrinkle pea plant.
ii. $\operatorname{Rr}$ (hybrid) - heterozygous. All are round since round is dominant over wrinkled.
iii. 3:1 (phenotypic ratio), 1:2:1 (genotypic ratio) The name of this cross is monohybrid cross.

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