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22 questions · timed · auto-graded

Question 11 Mark
Arrange the following set of a term in order, so as to be in a logical sequence. Rewrite the correct order.

Seed coat bursts, hypocotyls elongates, radicle grows downward, hypocotyls forms loop above the soil, epicotyls elongates.
Answer
Seed coat bursts, radicle grows downward, hypocotyls form loop above the soil, hypocotyls elongates, epicotyls elongate
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Question 21 Mark
Arrange the following set of a term in order, so as to be in a logical sequence. Rewrite the correct order.

Zygote, embryo, seed, allogamy, fusion of gametes.
Answer
Allogamy, fusion of gametes, zygote, embryo, seed
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Question 31 Mark
Arrange the following set of a term in order, so as to be in a logical sequence. Rewrite the correct order.

Embryo, $1^{st}$ male gamete, zygote, egg cell, micropyle.
Answer
Micropyle, $1^{st}$ male gamete, egg cell, zygote, embryo
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Question 101 Mark
Why do we not use the terms maize fruit and maize seed? What do we say instead?
Answer
Maize grain is actually a fruit in which the fruit wall and the seed coat are fused together to form a protective layer. Therefore, we do not use the terms maize fruit and maize seed. Instead, we call such fruits as grains.
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Question 111 Mark
Germinated grams are considered highly nutritive. What is the reason for this belief?
Answer
Germinated grams are considered highly nutritive because the cotyledon of the seed absorbs food from the endosperm, making it nutritive. It is rich in starch and its outermost layer is rich in protein.
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Question 121 Mark
Give anytwoexamples each of endospermic (albuminous) seeds,andnon-endospermic (exalbuminous) seeds.
Answer
Endospermic (albuminous) seeds: E.g. Castor, Maize, Poppy
Non-endospermic (exalbuminous) seeds: E.g. Bean, Gram, Pea
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Question 131 Mark
With regard to germination in bean seed, answer the following question:

Name the part of the seed that provides nutrition for the growing seedling.
Answer
The cotyledons of the seed provide nutrition for the growing seedling or the embryo.
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Question 141 Mark
With regard to germination in bean seed, answer the following question:

Name the part of the seed that grows into the seedling.
Answer
The embryo of the seed grows into the seedling.
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Question 151 Mark
With regard to germination in bean seed, answer the following question:

State the function of the 'micropyle'.
Answer
The 'micropyle' serves two important functions:
  • Allows absorption of water and makes it available to the embryo for germination.
  • Enables diffusion of respiratory gases for the growing embryo.
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Question 161 Mark
What is the role played by the hypocotyl in epigeal germination?
Answer
Germination of a seed that takes place above the ground is called epigeal germination. In epigeal germination, the hypocotyl grows to form a loop above the soil. It then straightens pushing the cotyledons above the ground.
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Question 171 Mark
Sometimes the potatoes kept in a basket during the late rainy season start giving out small shoots. Would you call it germination? Give reasons in support of your answer.
Answer
Yes, we call it germination because all the changes leading to the formation of a seedling collectively constitute germination. During germination, either the epicotyl or the hypocotyl elongates.
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Question 211 Mark
What is the function of the following in a seed?
Micropyle
Answer
During germination,micropyleallows water to enter the seed through its pore.
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Question 221 Mark
What is the function of the following in a seed?
Seed coat
Answer
It protects the delicate inner parts of the seed from injury and the attack of bacteria, fungi and insects.
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[1 Mark Question Answer] - BIOLOGY STD 9 Questions - Vidyadip