The entry of pollen tube in the embryo sac is guided by :

Observe the given diagram representing global biodiversity and answer the question.

Global Bio-diversity
___________ occupy more than 2/3rd of Global Biodiversity.

Read the passage carefully and give the answers to the question :
India was amongst the first countries in the world to initiate action plans and programmes at a national level to attain total reproductive health as a social goal.
These programmes called 'family planning' were initiated in 1951 and were periodically assessed over the past decades. Improved programmes covering wider reproduction-related areas are currently in operation. Creating awareness among the people about various reproduction-related aspects and providing facilities and support for building up a reproductively healthy society are the major tasks under these programmes.
'Saheli' - an oral contraceptive pill, also known as the 'Once a week' pill, was developed by :

Which of the following statements are correct with respect to gametogenesis?
(A) Division in primary oocytes is arrested at Prophase-I
(B) Secondary oocytes are diploid
(C) Spermatogonia undergo meiosis to form primary spermatocytes
(D) Spermatid transformed into spermatozoa by spermiogenesis
Choose the correct answer from the options given below:

Which of the followings belong to false fruit category?
(A). Apple
(B). Cashew
(C). Strawberry
(D). Orange
Choose the correct answer from the options given below:

Match List-I with List-II

List-I ( Terms)	List-II (Examples)
(A) Chromosomal disorder	(I) Color Blindness
(B) Incomplete dominance	(II) Drosophila
(C) Sex-linked recessive disorder	(III) Antirrhinum
(D) Male heterogamety	(IV) Down's Syndrome

Choose the correct answer from the options given below:

Antibody molecule is made up of four peptide chain called as light and heavy chain are joined together by :

Given differential equation,
\(\left(1+y^2\right) d x=\left(\tan ^{-1} y-x\right) d y\)
then which of the following is/are true?
(A) Integrating factor \(=\tan ^{-1} x\)
(B) Integrating factor \(=\tan ^{-1} y\)
(C) Integrating factor \(=e^{\tan ^{-1} y}\)
(D) Degree \(=1\)
Choose the correct answer from the options given below :

Which drug is an effective painkiller for patients who have undergone surgery?

The correct shape \(\&\) hybridisation for \(XeF_2\) are:

Below given are some statements about electronic devices:
(A) Diodes can be used for rectifying an ac voltage.
(B) For semiconductors, band gap energy \( E_g > 3 \, eV \).
(C) By changing the external applied voltage, junction barriers can be changed.
(D) p-n junction is the 'key' to all semiconductor devices.
Choose the correct answer from the options given below:

Consider \(Z = x + y\) subject to the constraints \(2x + y \le 3, 2x - y \ge 0, x \ge 0, y \ge 0\). The maximum value of Z is:

p-aminoazobenzene is produced from: