1. Describe the structure of a dicot seed.
( 2.) How would you demonstrate that oxygen and
temperature are essential for seeds to germinate.
3) A farmer plough his field and make the soil loose. Give
reasons.
4. Four dishes A, B, C and D containing bean seeds were
set up as follows and left for a few days:
I. Soaked seeds over dry cotton wool
Pg 60
II. Soaked seeds submerged in water
III. Dry seeds over dry cotton wool
on wool experimer
IV. Soaked seeds over dry iron plate
(a) In which dish would the seeds germinate the best?
Give a reason.
(b) What is the purpose of this experiment?
(c) In which dish would the germination be uncertain?
Answers
Answer:
1) A dicotyledonous seed is covered by a seed coat. A seed coat is made of two layers—an outer testa and an inner tegmen. There is a scar on the seed coat called hilum. Through the hilum, the developing seeds are attached to the fruit.
2) Oxygen is essential for respiration during which energy is liberated from food molecules. this energy is must for physiological processes including seed germination. For proper functioning of enzymes a certain range of temperature is necessary. Most seeds require a suitable temperature ranging from 25C to 37C .dress do not terminate at temperature below 0C or above 45C.
3) Ploughing of soil makes the soil loosen. Farmer plough his field so that soil of field looses and aeration can take place easily. Moreover, Ploughing also gives a way of seepage to water and nutrients.
4) Sorry I don't know this answer
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