Which of the following statements are correct?
(A) A lion eating a deer and a sparrow feeding on grains are ecologically similar consumers.
(B) Predator star fish Pisaster helps in maintaining the species diversity of some invertebrates.
(C) Predators ultimately lead to the extinction of prey species.
(D) Production of chemicals such as nicotine and strychnine by the plants are metabolic disorders.
Choose the correct answer from the options given below:

Androgens are synthesised and secreted by which of the following?

Match List-l with List-II

List l (Habitat)	List-II (Animal)
(A) Sunderbans	(I) Lion
(B) Periyar	(II) Wild ass
(C) Rann of Kutch	(III) Bengal tiger
(D) Gir	(IV) Elephant

Choose the correct answer from the options given below:

The triple fusion in angiosperms results in the development of:

Arrange the following stages in sequence of their occurrence during human reproduction:
(A) Implantation
(B) Cleavage
(C) Blastocyst
(D) Zygote
Choose the correct answer from the options given below:

A woman is not able to conceive naturally. Which of the following methods would not help her to conceive?

Which of the following is an example of a sex linked disorder?

Read the passage carefully and answer the Questions
Haloalkanes undergo nucelophilic substitution reactions owing to the polarity of C X bond. The nucleophile reacts with the haloalkane on the carbon possessing a partial positive charge holding the halogen atom. The halogen atom \(X\) is replaced by a nucleophile. Depending on the kinetics and mode of bond breaking, the mechanism can be either SN1 or SN2 reaction. The rate of SN1 reaction is governed by the stability of carbocation and in SN2 reaction, the rate of reaction is governed by steric factor. Chirality is the main factor in both SN1and SN2. In SN1 reaction, the chirality of alkyl halide is accompanied by racemization of the product, while in SN2 reaction, the product is characterized by inversion of configuration. The structure of alkyl halide and the nature of the solvent also governs the mechanism of the substitution.
What is chiral carbon ?

Which of the following compound is a gem-dihalide?

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at \(30^{\circ}\) with the horizontal. The horizontal component of the earth's magnetic field at the place is B . The strength of the earth's magnetic field at the place is :

The declared rate of return compounded semi annually equivalent to the effective rate of return \(10.25\%\) per annum is :

In the extraction of metallic Zn from calamine ore \(\left( ZnCO _3\right)\) following steps are involved :
(A) Distillation of impure Zn
(B) Calcination of the ore
(C) Hydraulic washing of ore
(D) Reduction of ZnO using coke
Choose the correct order of steps from the options given below :

Assume that R is a relation on the set \(\mathbb{Z}\) of integers and it is given by \((x, y) \in R \Leftrightarrow|x-y| \leq 1\). Then, \(R\) is