Biology MCQs PT2

In which of the following groups of organism, food materials is broken down outside the body and absorbed?

• Mushroom, green plants, amoeba

• Yeast, mushroom, bread mould

• Paramecium, amoeba, cuscuta

• Cuscuta, lice, tapeworms

If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected:

• Proteins breaking down into amino acids

• Starch breaking down into sugars

• Fats breaking down into fatty acids and glycerol

• Absorption of vitamins

During respiration exchange of gases take place in:

• Trachea and larynx

• Alveoli of lungs

• Throat and alveoli

• Throat and lungs

In which of the following vertebrate groups, there exist two chambered heart?

• Amphibians and reptiles

• Amphibians only

• Fishes only

• Fishes and amphibians

In neuron, conversion of electrical signal to a chemical signal occurs at:

• Cell body

• Axon end

• Dendritic end

• Axon

Growth of Pollen tube towards ovules is an example of:

• Phototropism

• Chemotropism

• Hydrotropism

• Geotropism

In the given food chain, suppose the amount of energy at fourth trophic level is 5 KJ, what will be the energy available at the producer level?

• 5KJ

• 50 KJ

• 500 KJ

• 5000 KJ

Assertion: Amphibians can tolerate mixing of oxygenated and deoxygenated blood. Reasoning: Amphibians are animals with two chambered heart.

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true but (R) is false.

• (A) is false but (R) is true.

Assertion: Plant hormones are growth regulators. Reasoning: Growth regulators promote or inhibit the growth.

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true but (R) is false.

• (A) is false but (R) is true.