Question 1

The body of the ovule is fused within the funicle at:

Accepted Answer

The attachment point of funicle and body of ovule is known as hilum.

Question 2

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

Accepted Answer

Following are the post-fertilisation changes.• 	Ovule →  Seed• 	Ovary →  Fruit• 	Zygote →  Embryo• 	Central cell →  Endosperm

Question 3

In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as:

Accepted Answer

The phenomenon in which female gamete develops into embryo without getting fused with male gamete (fertilisation) is called parthenogenesis.

Question 4

Persistent nucellus in the seed is known as:

Accepted Answer

Persistent Nucellus is called Perisperm e.g.: Black pepper, Beet

Question 5

The coconut water from tender coconut represents:

Accepted Answer

In tender coconuts, the coconut water represents free nuclear endosperm.

Question 6

Perisperm differs from endosperm in:

Accepted Answer

Perisperm is persistent nucellus within seeds. It is not common as nucellus is nutritive tissue provide nutrition to embryo sac. Nucellus is diploid tissue. In Beet, Piper it is persists within seed so it is diploid ( 2n ) while endosperm is a triploid (3n) tissue.

Question 7

The morphological nature of the edible part of coconut is:

Accepted Answer

Coconut has double endosperm with liquid endosperm and cellular endosperm.

Question 8

The wheat grain has an embryo with one large, shield-shaped cotyledon known as :

Accepted Answer

Scutellum is the large persistent cotyledon in embryo of wheat grain.

Question 9

Why do you think the zygote is dormant for sometime in a fertilised ovule?

Accepted Answer

Double fertilization leads to the formation of the zygote and primary endosperm nucleus simultaneously. The triploid primary endosperm nucleus divides to form large nutritive endosperm which serves as the source of nutrition for developing an embryo. To ensure the presence of nutritive endosperm, zygote remains dormant for some time.

Question 10

Differentiate between:(a) Hypocotyl and Epicotyl(b) Coleoptile and Coleorrhiza(c) Integument and Testa(d) Perisperm and Pericarp

Accepted Answer

(a) Hypocotyl is the part of embryonic axis between radicle and cotyledonary node while epicotyl forms the part of embryonic axis between plumule and cotyledonary node. (b) Coleoptile is a protective covering that surrounds part of epicotyl (the immature shoot). Coleorrhiza is an undifferentiated sheath of monocot seed that covers the radicle and the root cap. (c) Integuments are outer cell layers surrounding the megasporangium of an ovule and form seed coat after double fertilization while testa represents the outer layer of seed coat and develops from outer integument of ovule. (d) The presistent nucellus present in some seeds is called as perisperm. The fruit wall is pericarp and develops from ovarian wall.

Question 11

Why is apple called a false fruit? Which part(s) of the flower forms the fruit?

Accepted Answer

True fruits are the one developed from fertilized ovary. Apple is a false fruit as fleshy receptacle develops into the fruit here, not the fertilized ovary.

Question 12

If one can induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why?

Accepted Answer

Watermelon, lemon, orange should be selected to induce parthenocarpy because the seedless variety of these fruits would be much appreciated by the consumers.Parthenocarpy is the process of developing fruits without involving the process of fertilization or seed formation. Therefore, the seedless varieties of economically important fruits such as orange, lemon, watermelon etc. are produced using this technique. This technique involves inducing fruit formation by the application of plant growth hormones such as auxins.

Question 13

Which one of the following statements regarding post-fertilisation development in flowering plants is incorrect?

Accepted Answer

Ovules develop into seeds.

Question 14

The coconut water from tender coconut represents :

Accepted Answer

Coconut has multicellular endosperm (called coconut meal) in the outer part and free nuclear as well as vacuolate endosperm (called coconut milk or coconut water) in the centre.

Question 15

Two plants can be conclusively said to belong to the same species if they:

Accepted Answer

If two plants can reproduce freely with each other and form seeds, they are concluded to belong to same species. Plants belonging to same species have mostly every character common and will be able to reproduce freely with each other to produce new generations.

Question 16

Perisperm is:

Accepted Answer

Perisperm is the nutritive tissue derived from the nucellus that surrounds the embryo of seed in some angiosperm.

Question 17

पुष्पी पाद्पों में निषेचन के पश्चात विकास के विषय में निम्नलिखित में से कौन सा कथन गलत है?

Accepted Answer

पश्च निषेचन एक श्रृंखलाबद्ध प्रक्रिया है जो निषेचन के बाद होती है। पुष्पीय पौधों में पश्च निषेचन के बदलाव निम्नलिखित हैं ;- बीजाणु → बीज- अंडाशय → फल- युग्मनज → भ्रूण- केन्द्रीय कोशिका → भ्रूणपोष

Question 18

सहाय कोशिका में स्खलित हुए नर युग्मकों का परिणाम क्या होता है?

Accepted Answer

पुष्पीय पौधों में दो नर युग्मकों में से जो कि सहाय कोशिका में निकलते है, उनमें से एक अण्डाणु के साथ युग्मित होते हैं और अन्य द्वितीयक या केन्द्रीय कोशिका के साथ संयुक्त होते हैं। अण्डाणु (n) +1st  नर युग्मक (n)→ युग्मनज (2n)द्वितीयक केन्द्रक (2n)+2nd नर युग्मक (n)→ भ्रूणपोष केन्द्रक (3n) (केन्द्रीय कोशिका केन्द्रक)

Question 19

कच्चे नारियल में, नारियल पानी क्या है?

Accepted Answer

कच्चे हरे नारियल फल में स्वच्छ द्रव होता है। विकास के प्रारम्भिक अवस्था में, नाभिकीय प्रावस्था के दौरान नारियल के भ्रूणपोष के लिए यह द्रव निस्यंदन के रूप में कार्य करता है। वृद्धि के दौरान भ्रूणपोष कोशिकीय प्रावस्था के रूप में परिपक्व होता है तथा नारियल के कठोर कवच के भीतर जमा हो जाता है।

Question 20

मक्का के दाने के बीजपत्र को क्या कहा जाता है?

Accepted Answer

कॉटीलेडन को बीजपत्र कहा जाता है । ये भ्रूणाक्ष से जुड़े होते हैं। द्विबीज पत्री में दे बीज पत्र होते हैं तथा एकबीजपत्री में एक बीज पत्र होता है। अनाज वर्ग के बीजों में एकल ढालाकार बीजपत्र होता है जिसे स्कयूटेलम कहते हैं।

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Solutions for Post Fertilization Changes Important Questions

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