The enzyme responsible for reduction of molecular nitrogen to ammonia in leguminous plant is

• Nitrite reductase 

• Nitrate reductase

• Nitrogenous

• All of the above

A plant forms spores, have vascular system, but does not form flower and seed can be placed under

• Algae

• Bryophyta

• Pteridophyta

• Gymnosperm

173.

If somehow the distance between the Sun and the Earth is doubled, the gravitational force between them will become

• double

• half

• four times

• one-fourth

Which type of hybridization occurs in ClF₃?

• sp³

• sp²

• sp²d

• sp³d

Marsh gas is

• Methane

• Ethane

• Propane

• Butane

In the diagram of animal cell given below, the correct labeling of the parts A, B, C and D is

• A - cell membrane

  B - plastids

  C - nucleus

  D - chloroplast

• A - cell wall

  B - vacuole

  C - nucleus

  D - mitochondria

• A - cell wall

  B - vacuole

  C - chloroplast

  D - nucleus

• A - cell membrane

  B - vacuole

  C - nucleus

  D - cytoplasm

A boy has a thick paste of turmeric. On adding this paste to hydrochloric acid and an aqueous solution of sodium hydroxide separately, what color (s) would he observe?

• Pink in hydrochloric acid and blue in sodium hydroxide

• Blue in hydrochloric acid and red in sodium hydroxide

• Yell ow in both cases

• Yellow in hydrochloric acid and red in sodium hydroxide

Study the following statements with reference to the villi of the small intestine.

1. They are finger-like outgrowths and thousands in number.
2. They have very thin walls.
3. They have a network of thin and small blood vessels close to the surface
4. They have small pores through which food can easily pass.

The statements which enable the villi to absorb the digested food are

• A, B and C

• B, C and D

• A and B

• C and D

Given below are some food items.

1. Boiled and mashed potato
2. Boiled and chewed rice
3. A slice of bread
4. Sugar solution
5. Coconut oil

Which of the above will give a blue-black colour when tested with iodine solution?

• A, B and C

• A, C and E

• A and C

• B and D

The pseudopodia of Amoeba are used for

• movement

• movement and capture of food

• sensing the food

• capture of food