Solved MCQs of Biology Class 9 Chapter 7

At …………..°C the process of photosynthesis stops.

20°C

30°C

25°C

45°cC

Electron transport chain takes place in:

Mitochondria

Cytoplasm

Nucleus

Ribosomes

……… is one of raw material for photosynthesis .

Oxygen

Water

Carbon Dioxide

Nitrogen

There are … types of photosynthesis pigments.

One

Two

Three

Four

Anaerobic respiration occurs in the absence of …………. .

Oxygen

Carbon

Nitrogen

All

A cell hydrolyses ATP to ADP & inorganic phosphate & almost ………….. Kcal energy is released.

7.3 Kcal

7.4 Kcal

7.2 Kcal

7.5 Kcal

When a plant was kept in darkness for many days, many days, its leaves turned yellow. Why?

Leaves could not get oxygen and so there was no photosynthesis

Leaves could not get light and so there was no respiration

Leaves could not get oxygen and so there was no respiration

Leaves could not get light and so there was no photosynthesis

The air enters the leaf through __________

Pits

Stomata

Mesophyll

Xylem vessels

There are _________ P-bonds in an ATP molecule.

Two

Nine

Six

Four

In living organisms, redox reactions involving the loss and gain of _____________ atom.

Oxygen

Carbon

Nitrogen

Hydrogen