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Assertion : Atmospheric nitrogen is always fixed by nitrogen-fixing microorganisms.
Reason : They convert ammonia present in atmosphere to nitrites and nitrates.
In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the four statements, given below, mark one as the correct answer

A if both Assertion and Reason are true and Reason is the correct explanation of Assertion
B if both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C if Assertion is true but Reason is false
D if both Assertion and Reason are false.

They are pipe-like, consisting of a group of specialised cells. They transport substances and form a two-way traffic in plants. Which of the following terms qualify for the features mentioned above?

A Xylem tissue
B Vascular tissue
C Root hair
D Phloem tissue

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Plants do not take in nitrogen.
Reason : Nitrogen is harmful for plants.

A If both assertion and reason are true and reason is the correct explanation of assertion.
B If both assertion and reason are true but reason is not the correct explanation of assertion.
C If assertion is true but reason is false.
D If assertion is false but reason is true.

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Water lily plant has small, thin and needle like leaves.
Reason : Water lily is a submerged aquatic plant.

A If both assertion and reason are true and reason is the correct explanation of assertion.
B If both assertion and reason are true but reason is not the correct explanation of assertion.
C If assertion is true but reason is false.
D If assertion is false but reason is true.

Read the following statements with reference to the villi of small intestine.
(i) They have very thin walls.
(ii) They have a network of thin and small blood vessels close to the surface.
(iii) They have small pores through which food can easily pass.
(iv) They are finger-like projections.
Identify those statements which enable the villi to absorb digested food.

A (i), (ii) and (iv)
B (ii), (iii) and (iv)
C (iii) and (iv)
D (i) and (iv)

Given below from (i) to (iv) are some food items.
(i) Boiled and mashed potato
(ii) Glucose solution
(iii) A slice of bread
(iv) Mustard oil
Which of the above will give blue-black colour when tested with iodine?

A (i) and (ii)
B (i) and (iii)
C (ii) and (iii)
D (iii) and (iv).

Choose the correct statement with respect to unicellular organisms.

A In unicellular organisms, tissues work in coordination to perform different functions.
B Unicellular organisms do not require food.
C Unicellular organisms respire and reproduce.
D All unicellular organisms move by cilia.

Assertion : A bigger organism has a large number of cells than a smaller one.
Reason : The size of cell is related to the size of the organism.
In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the four statements, given below, mark one as the correct answer

A if both Assertion and Reason are true and Reason is the correct explanation of Assertion
B if both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C if Assertion is true but Reason is false
D if both Assertion and Reason are false.

Two organisms are good friends and live together. One provides shelter, water and nutrients while the other prepares and provides food. Such an association of organisms is termed as

A saprophyte
B parasite
C autotroph
D symbiosis.