..................................................... हा लैंगिक प्रजननाचा प्रकार आहे.
..................................................... हा लैंगिक प्रजननाचा प्रकार आहे.
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- अलैंगिक प्रजनन: गॅमेट्सशिवाय संतती निर्मिती (उदा. खंडीभवन, पुनर्जनन, मुकुलायन).
ओळख टिप: "गॅमेट्स" किंवा "फलन" दिसले की तो लैंगिक प्रजननाचा प्रकार आहे.
- खंडीभवन
- पुनर्जनन
युग्मकनिर्मिती
- मुकुलायन
The Correct Option is C
Solution and Explanation
Step 1: संकल्पना ओळख
लैंगिक प्रजनन (Sexual Reproduction) म्हणजे दोन भिन्न गॅमेट्स (युग्मक) — नर गॅमेट (शुक्राणू) आणि मादी गॅमेट (अंडाणू) — यांच्या संयोगाने नवीन संततीची निर्मिती होणे.
Step 2: युग्मकनिर्मितीचे महत्त्व
युग्मकनिर्मिती (Gamete Formation) हा लैंगिक प्रजननाचा मुख्य टप्पा आहे. यात मायोसिस प्रक्रियेद्वारे हॅप्लॉइड गॅमेट्स तयार होतात. हे गॅमेट्स नंतर फलन (Fertilization) प्रक्रियेत एकत्र येऊन डिप्लॉइड झायगोट तयार करतात.
Step 3: पर्यायांचे विश्लेषण
- (अ) खंडीभवन: हा अलैंगिक प्रजननाचा प्रकार आहे, ज्यात जीव दोन भागांत विभागला जातो (उदा. ॲमीबा).
- (ब) पुनर्जनन: हा देखील अलैंगिक प्रजननाचा प्रकार आहे, ज्यात जीवाचा तुकडा नवीन जीव तयार करतो (उदा. प्लॅनॅरिया).
- (क) युग्मकनिर्मिती: योग्य. हा लैंगिक प्रजननाचा आवश्यक टप्पा आहे.
- (ड) मुकुलायन: हा अलैंगिक प्रजननाचा प्रकार आहे, ज्यात नवीन जीव कळीपासून तयार होतो (उदा. यीस्ट).
Step 4: निष्कर्ष
लैंगिक प्रजननात गॅमेट्सची निर्मिती आणि त्यांचा संयोग हा मुख्य घटक असल्याने योग्य उत्तर आहे — युग्मकनिर्मिती.
Top Questions on Human Reproduction
Arrange the following events in the correct order pertaining to fertilization in the human reproductive system.
(A) The blastocyst becomes embedded in the endometrium.
(B) Finger-like projections appear on the trophoblast called chorionic villi.
(C) The blastomeres are arranged into trophoblast and the inner cell mass.
(D) The zygote divides mitotically and transforms into an embryo with 8-16 blastomeres, called a morula.
- CUET (UG) - 2025
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Study the graphs given below for Case 1 and Case 2 showing different levels of certain hormones and answer the question that follows:
(a) Which hormone is responsible for the peak observed in Case 1 and Case 2? Write one function of that hormone.
(b) Write changes that take place in the ovary and uterus during follicular phase.
Student to attempt either sub-part (c) or (d):
(c) Name the hormone Q of Case 2. Write one function of hormone Q.
OR
(d) Which structure in the ovary will remain functional in Case 2? How is it formed?- CBSE CLASS XII - 2025
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- Shyam and Radha are expecting their first child with Radha being in her second month of pregnancy with no complications. Shyam’s family has a history of cystic fibrosis while Radha’s family has a history of Down’s syndrome, leading to a concern that the baby may have one of these conditions.
(a) Suggest and explain a way of testing if their baby is at risk for any genetic disorders.
(b) In case of presence of one or both of the abnormalities and posing a risk to the mother’s health, mention one possible option for them to consider. Is that option safe for Radha at the current gestational age? Justify.
(c) Under what conditions is the process mentioned in (b) illegal?- CBSE CLASS XII - 2025
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- Assertion (A): Saheli is the World’s first non-steroidal oral contraceptive pill.
Reason (R): It has been developed by National Institute of Immunology, New Delhi.- CBSE CLASS XII - 2025
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Match the following items of Column-I with that of Column-II:
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Questions Asked in Maharashtra Class X Board exam
- Appreciation of the poem:
Read the following poem and write an appreciation of it with the help of the points given below:
Stopping by Woods on a Snowy Evening
Whose woods these are I think I know.
His house is in the village, though;
He will not see me stopping here
To watch his woods fill up with snow
My little horse must think it queer
To stop without a farmhouse near
Between the woods and frozen lake
The darkest evening of the year.
He gives his harness bells a shake
To ask if there is some mistake.
The only other sound’s the sweep
Of easy wind and downy flake.
The woods are lovely, dark and deep,
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep.
Robert Frost
- Maharashtra Class X Board - 2025
- Reading Comprehension
- Pick out the infinitive from the following sentence :
He was asking to go for the concert.- Maharashtra Class X Board - 2025
- Grammar and Language Usage
- Out of the following which is a Pythagorean triplet ?
In the following figure \(\triangle\) ABC, B-D-C and BD = 7, BC = 20, then find \(\frac{A(\triangle ABD)}{A(\triangle ABC)}\).
- Maharashtra Class X Board - 2025
- Properties of Triangles
The radius of a circle with centre 'P' is 10 cm. If chord AB of the circle subtends a right angle at P, find area of minor sector by using the following activity. (\(\pi = 3.14\))
Activity :
r = 10 cm, \(\theta\) = 90\(^\circ\), \(\pi\) = 3.14.
A(P-AXB) = \(\frac{\theta}{360} \times \boxed{\phantom{\pi r^2}}\) = \(\frac{\boxed{\phantom{90}}}{360} \times 3.14 \times 10^2\) = \(\frac{1}{4} \times \boxed{\phantom{314}}\) <br>
A(P-AXB) = \(\boxed{\phantom{78.5}}\) sq. cm.