Home
Class 12
BIOLOGY
Read the following statements - P . Ea...

Read the following statements -
P . Each famale foetus ovary possess a couple of billion gamete mother cells.
Q. Spermatogenesis starts at puberty
R. In semen, at least 40% sperms should have a normal shape for fertility.
How many of given statements are not true?

A

None

B

One

C

Two

D

Three

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate each of the three statements provided and determine how many of them are not true. ### Step-by-Step Solution: 1. **Evaluate Statement P**: - **Statement**: Each female fetus ovary possesses a couple of billion gamete mother cells. - **Analysis**: In females, during fetal development, the ovaries contain a large number of oocytes (gamete mother cells). However, the number is in the millions, not billions. Therefore, this statement is **not true**. 2. **Evaluate Statement Q**: - **Statement**: Spermatogenesis starts at puberty. - **Analysis**: Spermatogenesis is the process of sperm cell formation, which indeed begins at puberty when hormonal changes trigger the development of sperm. Therefore, this statement is **true**. 3. **Evaluate Statement R**: - **Statement**: In semen, at least 40% of sperms should have a normal shape for fertility. - **Analysis**: For male fertility, it is generally accepted that at least 60% of sperm should have a normal shape (morphology). The 40% figure is often associated with the minimum acceptable motility rate. Therefore, this statement is **not true**. ### Conclusion: - Statement P is not true. - Statement Q is true. - Statement R is not true. Thus, **two statements (P and R) are not true**. ### Final Answer: The number of given statements that are not true is **2**. ---
Promotional Banner

Similar Questions

Explore conceptually related problems

Given below are four statement (A-D) each with one of two blanks .Select the option which correctly fill up the blanks in two statements A The human male ejaculates about (i) million sperms during a cooitus . Out of which for normal fertility at teast (iii) percent sperms must have normal shape and size B. A primary spermatocyte completes (i) meiotic division leading to the formation of two equal haploid cells called (i) C. Spermatogenesis starts at the age of (i) due to significant increase in the secretion of (ii) a hypothalamic hormone D. Oogenesisi is initiated during embryonic development and at puberty only (i) primary follicles are left in each overy

Each question contains statements given in two columns which have to be matched . Statement (A,B,C,D) in column I have to be matched statements (p,q,r,s) in column II. Capillary rise and shape of droplets on a plate due to surface tension are shown in column - II . Match the following

Each question contains statements given in two columns which have to be matched . Statement (A,B,C,D) in column I have to be matched statements (p,q,r,s) in column II. Capillary rise and shape of droplets on a plate due to surface tension are shown in column - II . Match the following

Each question contains statements given in two columns which have to be matched. Statements a,b,c,d in column I have to be matched with statements p,q,r,s in column II. If the correct matches are a-p, q-s, b-q, r c-p, q and d-s, then the correctly bubbled 4x4 matrix should be as follows: Figure Column I, Column II: Differential equation order 1, p. of all parabolas whose axis is the x-axis order 2, q. of family of curves y=a(x+a)^2, whre a is an arbitrary constant degree 1, r. (1+3(dy)/(dx))^(2/3)=(4d^3y)/(dx^3) degree 3, s. of family of curve y^2=2c(x+sqrt(c)), where c >0

Each equation contains statements given in two columns which have to be matched. Statements (a,b,c,d) in column I have to be matched with Statements (p, q, r, s) in column II. If the correct match are avecp ,avecs ,bvecq ,bvecr , cvecp , cvecq , and dvecs , then the correctly bubbled 4x4 matrix should be as follows: Figure Consider the lines represented by equation (x^2+x y-x)x(x-y)=0, forming a triangle. Then match the following: Column I|Column II Orthocenter of triangle |p. (1/6,1/2) Circumcenter|q. (1(2+2sqrt(2)),1/2) Centroid|r. (0,1/2) Incenter|s. (1/2,1/2)

Each question contains statements given in two columns which have to be matched. Statements a,b,c,d in column I have to be matched with statements p,q,r,s in column II. If the correct match are a-p, a-s, b-r, c-p, c-q, and d-s, then the correctly bubbled 4 x 4 matrix should be as follows: fig Column I, Column II If L=""("lim")_(xvec-1)((7-x)^(1/3)-2)/((x+1)),t h e n12 L= , p. -2 If L=""("lim")_(xvecpi/4)(tan^3x-tanx)/(cos(x+pi/4)),t h e n-L/4= , q. 2 If L=""("lim")_(xvec1)((2x-3)(sqrt(x)-1))/(2x^2+x-3),t h e n20 L= , r. 1 If L=""("lim")_(xvecoo)(logx^n-[x])/([x]),w h e r en in N ,([x] denotes greatest integer less than or equal to x),t h e n-2L= , s. -1

Each question contains statements given in two columns which have to be matched. Statements (a,b,c,d) in column I have to be matched with statements (p,q,r,s) in column II. If the correct match are a-p, s, b-r c-p, q. and d-s, then the correctly bubbled 4x4 matrix should be as follows: figure Column I, a) If int(2^x)/(sqrt(1-4^x))dx=ksin^(-1)(f(x))+C , then k is greater than, b) If int((sqrt(x))^5)/((sqrt(x))^7+x^6)dx=aln(x^k)/(x^k+1)+c , then a k is less than, c) If int(x^4+1)/(x(x^2+1)^2)dx=kln|x|+m/(1+x^2)+n , where n is the constant of integration, then m k is greater than, d) If int(dx)/(5+4cosx)=ktan^(-1)(mt a n x/2)+C , then k//m is greater than, COLUMN II p) 0 q) 1 r) 3 s)4