Trusted by millions of Kenyans
LoginRegister
Study resources on Kenyaplex

Get ready-made curriculum aligned revision materials

Exam papers, notes, holiday assignments and topical questions – all aligned to the Kenyan curriculum.

Browse exam papers
Or go directly to:
Class notes Holiday assignments Topical questions Other resources

In an experiment, 900 viable seeds of a certain plant species were divided into groups of 100 seeds each. Each group of seeds was placed at...

In an experiment, 900 viable seeds of a certain plant species were divided into groups of 100 seeds each. Each group of
seeds was placed at different temperatures but same conditions of air and moisture. The percent germination was
determined after 10 days. The table below shows percent germination at the various temperatures.
52420191059.png
a) Using a suitable scale, draw a graph of percent germination against temperature.
b) Account for percent germination at :
i) 50°
ii) 30°C
iii) 40°C
c) Explain the role played by each of the following factors in the germination of seeds.
i) Water.
ii) Air.

Answers

sharon
52420191102.png
b) i) 50°C
Enzymatic / metabolic activities / rate of respiration too slow; due to too low temperature; hence no germination.
ii) 30°C
Optimum temperature; therefore maximum enzymatic / metabolic activity / respiration rate; hence maximum germination;
iii) 40°C
Enzymes denatured / destroyed; due to high temperature; hence low germination;
c) i) Water
Medium for enzyme activity; hydrolysis of stored food into simpler substances; medium for transport; softening the seed;
acting as solvent; (any correct three)
ii) Air
Contains oxygen; used for oxidation of food to release energy;
sharon kalunda answered the question on May 24, 2019 at 08:05

Answer Attachments

Next: Read the poem below and answer questions that follow. The sweetest thing by Ibid.

Previous: Consider the following dialogue and describe the shortcomings of Orgon’s listening skills.

View more Biology Questions and Answers  |  Return to Questions Index

Exams With Marking Schemes

Related Questions