Selina solutions concise biology class 9 icse Solutions for Chapter 6 seeds structure and germination

Which one of the following plant parts is correctly matched with one of its stated characteristic?

(a) Mango seed ____________ aleurone layer

(b) Bean seed ___________ endosperm

(c) Maize grain __________ coleoptile

(d) Wheat grain __________ exalbuminous

Seeds sown very deep in the soil fail to germinate because they

(a) Cannot exert enough force to push the soil upward.

(b) Do not get enough sunlight.

(c) Get to much water.

(d) Do not get enough oxygen

Answer the following statements true (T) or false (F)?

(a) Some seeds have no cotyledons at all. T/F

(b) Maize grain is fruit and not a seed. T/F

(c) Seeds fallen in a flower-bed from the previous crop usually do not germinate until the

next sowing season. T/F

(d) Oxygen is necessary for the germination of seeds. T/F

Name the following:

(a) A monocotyledonous endospermic seed.

(b) A chemical used in experiments, which absorbs oxygen.

(c) Part of the plumule above the embryonic axis of the seed.

(d) A plant which shows viviparous germination.

(e) The layer of endosperm of maize, rich in protein.

(f) A seed with folded plumule leaves.

Fill in the blanks:

(a) In bean seeds, ___________ grows faster and the seeds are brought ______ ground.

(b) ___________ is a protective layer of radicle and ______ protects the rolled plumule.

(c) A seed is protected by __________ and ________

(d) Seeds absorb water through _________ which also helps in diffusion of respiratory

gases.

(e) Rice, wheat, and maize are rich in ________ food.

Arrange the following set of terms in order, so as to be in logical sequence. Rewrite the correct order.

(a) Embryo, 1st male gamete, zygote, egg cell, micropyle.

(b) Zygote, embryo, seed, allogamy, fusion of gametes.

(c) Seed coat bursts, hypocotyl elongates, radicle grows downwards, hypocotyl forms loop above the soil, epicotyl elongates.

In experiment No.5 we are using mercury in the test-tube and the beaker. Why can’t we use water instead?

What is the difference between an embryo and a seed?

Give any two examples each of endospermic (albuminous) seed, and non-endospermic (exalbuminous) seeds

Germinated grams are considered highly nutritive. What is the reason for this belief?

Why do we not use the terms maize fruit and maize seed? What do we say instead?

What are the functions of the following in a seed? (a) Seed coat (b) Micropyle (c) Cotyledons (d) Radicle (e) Plumule

Suggest an experiment to prove that a suitable temperature is necessary for germination

Sometimes the potatoes kept in a basket during the rainy season start giving out small shoots. Would you call it germination? Give reason in support of your answer.

Give two differences in each of the following pairs:

(a) Epigeal germination and hypogeal germination

(b) Coleorhiza and coleoptile.

(c) Bean seed and maize grain.

Differentiate between germination and vivipary.

Justify the statement that the maize grain is a ‘one seeded fruit’.

What is the role played by the hypocotyl in epigeal germination?

With regard to germination in bean seed, answer the following questions:

(a) State the function of the ‘Micropyle’.

(b) Name the part of the seed that grows into the seedling.

(c) Name the part of the seed that provides nutrition for the growing seedling.

(d) Draw a neat labeled diagram of a mature bean seed