Question

अंक-3 शब्दसीमा 50-75
What is double fertilization and triple fusion ? Name the nuclei involved in triple
fusion?
3. प्रसव क्या है ? इसे कौन से हार्मोन प्रेरित करते है ?
निम्नलिखित के एक-एक कार्य लिखिए :-
अंक-4 शब्दसीमा 75-100
(b) अंडाशय
What is parturition ? which hormones are involved in induction of parturition.
Write the function of each of the following :-
( (a) Testes
( (b) Ovary
(a) वृषण
शुक्राणुजनन क्या है ? इसमें सम्मिलित हार्मोस कौन से है ? सचित्र इस प्रक्रिया क
तार्णन लिरिवा।
Tr​

Answer 1

Explanation:

1. The main difference between double fertilization and triple fusion is that double fertilization is the fusion of the embryo sac with two sperm cells whereas triple fusion is the fusion of sperm nucleus with the two polar nuclei in the central cell of the embryo saca.

• A primary endosperm nucleus, triploid in nature is formed when the other male gamete combines with the two polar nuclei that are located in the central cell. Since the process involves the combining or fusing of three haploid nuclei, it is referred to as triple fusion.
• 3) Vigorous contraction of the uterus at the end of pregnancy causes expulsion/delivery of the foetus. This process of delivery of the foetus is called parturition.It is induced by hormone oxytocin which acts on the uterine muscle and causes stronger uterine contractions.

Answer 2

Answer:

uj1 point

19. महात्मा गांधी ने किस वर्ष में राष्ट्रीय

रचनात्मक आंदोलन को आरंभ किया

इसमें भारत में एक करोड़ सदस्य बनाने

तिलक स्वराज फंड के लिए

1,00,00,000 रुपए एकत्रित करने तथा

20.00,060 चरखे स्थापित करने का

लक्ष्य रखा

1. वर्ष 1919

2 वर्ष 1920

3. वर्ष 1922

4. वर्ष 1921