The exine of pollen grains is made up of :

Which bacteria fix the atmospheric nitrogen into organic form to be utilized by plants as nutrients?

The fruit which develops without fertilisation is called :

Which of the following structures produces both eggs and hormones in human females?

Which one of the following diseases is non-infectious?

Three cells grouped together at the micropylar end and constitute __________ in the embryo sac.

Read the following passage carefully and answer the given questions.
Plasmodium, a tiny protozoan is responsible for the disease malaria. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal. Innate immunity consist of four types of barriers. These are – (i) Physical barriers- skin on our body is the main barrier which prevents entry of the micro-organisms. (ii) Physiological barriers- Acid in the stomach, saliva in the mouth, tears from eyes-all prevent microbial growth. (iii) Cellular barriers- Certain types of leukocytes (WBC) of our body like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. (iv) Cytokine barriers- virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection. Allergy is due to the release of chemicals like histamine and serotonin from the mast cells. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Drugs like barbiturates, amphetamines, benzodiazepines, and other similar drugs, that are normally used as medicines to help patients cope with mental illnesses like depression and insomnia, are often abused.
Which one of the following drugs is not used as medicine to help patients cope with mental illnesses like depression and insomnia?

Which of the following is NOT correct about a Sinking Fund?

For the reaction: \(2 A_2(g)+1 / 4 X ( g ) \rightarrow 2 A_2 X ( g )\), if the volume is increased to double its value by decreasing the pressure, and the reaction is first order with respect to \(X\) and second order with respect to \(A _2\), the rate of reaction will:

A lamp rating 8 V, 800 W is connected to a 100 V, 50 Hz a. c. source. The inductance of the choke required in the circuit is: (Take \( \pi = 3 \))

Match List I with List II

LIST I	LIST II
A. RNA interference	I. alpha-lactalbumin enriched food
B. Bt cotton	II. Vitamin A enriched food
C. Golden rice	III. Resistant to boll worms
D. Rosie	IV. To develop nematode resistance crops

Choose the correct answer from the options given below:

An individual with 44+XO karyotype is suffering from which of the following disorder?

If \(x_1, x_2, x_3,\)........,\(x_n\) are \(n\) observations in a sample then which of following is/are TRUE?
(A) The mean \(\bar{x}\) has \(n\) degree of freedom
(B) The mean \(\bar{x}\) has ( \(n-1\) ) degree of freedom
(C) The standard deviation of the sample has ( \(n-1\) ) degree of freedom
(D) The standard deviation of the sample has \(n\) degree of freedom
Choose the correct answer from the options given below :