The biggest single-celled organism is

• Yeast

• Acetabularia

• Acetobacter

• Amoeba

The plant from which cocoa and chocolate are obtained

• herb

• shrub

• small tree

• very big tree

What is farming along with animal husbandry called?

• Mixed farming

• Mixed agriculture

• Dairy farming

• Truck farming

224.

Foramen Magnum is an aperture found in the

• ear

• lung

• girdle

• skull

In ferns, the xylem is

• polyarch

• exarch

• endarch

• mesarch

The layer present in between xylem and phloem in dicot stem is

• starch sheath

• pith

• stele

• cambium

In nature, trophic levels are found in

• tissue system

• root system

• shoot system

• eco system

How many chromosomes pairs are in a human body?

• 24

• 19

• 22

• 23

Which among the following is not correctly paired?

• Formic acid : Vinegar

• Lactic acid : Milk

• Citric acid : Lemon

• Butyric acid : Rancid butter

Enzymes are

• carbohydrates

• biological catalysts

• fats

• None of these