Question

3TEST OF BIOLOGY CHAPTER RESPIRATION IN PLANTS

Answer 1

The process of respiration in green plants occurs
a) only when stomata are open
b) only when photosynthesis ceases
c) only when photosynthesis is in progress
d) At all times

Respiratory enzymes are located in
a) mitochondrial matrix
b) cristae
c) perimitochondrial space
d) outer membrane

The site of glycolysis in a cell is
a) chloroplast
b) nucleus
c) cytoplasm
d) mitochondria

The annual plant exchange of gases takes place mainly through
a) Leaf scars
b) lenticels
c) stomata
d) stem

Kreb’s cycle take place in
a) vesicles of ER
b) Mitochondrial matrix
c) lysosomes
d) Dictyosom

In succulent xerophytes the R.Q is :
a) Zero
b) unity
c) less than one
d) more than one

R.Q. of fatty substances is generally:
a) unity
b) Zero
c) more than one
d) less than one

Conversion of pyruvic acid into ethyl alcohol is facilitated by the enzymes:
a) carboxylase
b)phosphatase
c) dehygrogenase
d) carboxylase and dehygrogenase

During respiration yeast converts glucose to
a) ethanol and water
b) ethanol and oxygen
c) ethanol and CO2
d) lactic acid and CO2

. The net gain of ATP produced during the oxidation of one glucose molecule in a plant cell
a) 38 ATP molecules
b) 30 ATP molecules
c) 36 ATP molecules
d) 24 ATP molecules

The final acceptor of electrons in the electron transport chain is
a) Water
b) Oxygen
c) Hydrogen
d) Cytochrome b

. In plant cell, digestion of fats occurs with the help of
a) lysosomes
b) Peroxisomes
c) glyoxisomes
d) microtubules

Answer 2

All of us breathe to live, but why is breathing so essential to life? What happens when we breathe? Also, do all living organisms, including plants and microbes, breathe? If so, how? All living organisms need energy for carrying out daily life activities, be it absorption, transport, movement, reproduction or even breathing. Where does all this energy come from? We know we eat food for energy – but how is this energy taken from food? How is this energy utilised? Do all foods give the same amount of energy? Do plants ‘eat’? Where do plants get their energy from? And micro-organisms – for their energy requirements, do they eat ‘food’? You may wonder at the several questions raised above – they may seem to be very disconnected. But in reality, the process of breathing is very much connected to the process of release of energy from food. Let us try and understand how this happens. All the energy required for ‘life’ processes is obtained by oxidation of some macromolecules that we call ‘food’. Only green plants and cyanobacteria can prepare their own food; by the process of photosynthesis they trap light energy and convert it into chemical energy that is stored in the bonds of carbohydrates like glucose, sucrose and starch. We must remember that in green plants too, not all cells, tissues and organs photosynthesise; only cells containing chloroplasts, that are most often located in the superficial layers, carry out photosynthesis. Hence, even in green plants all other organs, tissues and cells that are non-green, need food for oxidation. Hence, food has to be translocated to all nongreen parts. Animals are heterotrophic, i.e., they obtain food from plants