Study the four statements (a–d) given below and select the two correct ones out of them:

a:	A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
b:	Predator starfish Pisaster helps in maintaining 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 plants is metabolic disorder

The two correct statements are:
1. a and d
2. a and b
3. b and c
4. c and d

Seminal plasma in human males is rich in:

1. fructose and calcium

2. glucose and calcium

3. DNA and testosterone

4. ribose and potassium

ABO blood groups in humans are controlled by the gene I. It has three alleles – I^A I^B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

1. Three

2. One

3. Four

4. Two

Breeding of crops with high levels of minerals, vitamins, and proteins is called:

A common biocontrol agent for the control of plant diseases is:

1. Baculovirus

2. Bacillus thuringiensis

3. Glomus

4. Trichoderma

Widal test is used for the diagnosis of:

1. malaria

2. pneumonia

3. tuberculosis

4. typhoid

Injury to adrenal cortex is not likely to affect the secretion of which one of the following?

1. Aldosterone

2. Both androstenedione and dehydroepiandrosterone

3. Adrenalin

4. Cortisol

Low Ca²⁺ in the body fluid may be the cause of:

1. tetany

2. anaemia

3. angina pectoris

4. gout

Which one of the following pairs is incorrectly matched?

1. Glucagon- Beta cells(source)

2. Somatostatin- Delta cells(source)

3. Corpus luteum- Relaxin(secretion)

4. Insulin- Diabetes mellitus(disease)

Select the correct statement from the ones given below with respect to dihybrid cross: