Q: How many organisms in the list given below are autotrophs? Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia

\$\textbf{Correct Option B}\$ \$\textbf{Solution}\$\$\bullet\$ Autotrophs are the organisms which are capable of manufacturing their own food with the help of photosynthesis or chemosynthesis.\$\bullet\$ Autotrophs are classified into two major groups namely: Photoautotrophs and chemoautotrophs. \$\bullet\$ Nostoc, Chara, Porphyra and Wolffia are photo synthetic autotrophs as they obtain their food through photosynthesis. \$\bullet\$ Nitrosomonas and nitrobacter are chemosynthetic autotrophs because they make their own food using energy from chemical reactions. \$\bullet\$ From the rest organisms lactobacillus, Streptomyces and saccharomyces have heterotrophic mode of nutrition. While Trypanosoma is a parasitic organism. \$\bullet\$ So, only six of them are autotrophs. \$\bullet\$ So, the correct option is B.

Q: \${C_{40} H_{56} O_4}\$ is the chemical formula of

Carotenol is a yellow pigment. The chemical formula is C\$_{40}H_{56}O_{2}\$.Chlorophyll is a green pigment found in cyanobacteria and the chloroplasts of algae and plants. The chemical formula of chlorophyll a is C\$_{55}H_{72}O_{5}N_{4}Mg\$. The chemical formula of chlorophyll b ic C\$_{55}H_{72}O_{6}N_{4}Mg\$.Carotene is an orange photosynthetic pigment important for photosynthesis. The chemical formula is C\$_{40}H_{56}\$.So, the correct answer is option D.

Q: \$C_{4}\$ photosynthesis does not occur in

Plants exhibiting characteristic kranz anatomy are \$C_4\$ plants. Spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of \$C_4\$ plants respectively avoids photorespiration by concentrating \$CO_2\$ in bundle sheath cells to scale down the oxygenase activity of RUBISCO and increase the RUBISCO efficiency. Zea mays and Saccharum spp are \$C_4\$ plant while Euphorbia splendens is a CAM plant that reduces water loss by opening the stomata at night only. So, the correct answer is option D.

Question 1

In leaves, name the cell organelle and pigment that is responsible for green colour.

Accepted Answer

The chloroplast is a type of plastid, which produces green colored pigment called chlorophyll. The chloroplast is involved in carrying out photosynthesis. It gives a green color to leaves. So, the correct answer is option A.

Question 2

The ratio between 3- carbon and 2- carbon intermediates having -$NH_{2}$ group formed in photosynthetic oxidation cycle is

Accepted Answer

Photorespiration is a process in plant which is otherwise called as photosynthetic oxidation cycle. It attempts to reduce the consequences of a wasteful oxygenation reaction by the enzyme RuBisCO. The ratio between 3-carbon intermediates (serine and glycerate) and 2-carbon (glycine) having NH$_{2}$ group formed in photosynthetic oxidation cycle is 2:1.

Question 3

Select the incorrect matched pair with regard to $C_{4}$ cycle.

(a)
Primary $C O_{2}$ fixation product
-
PGA

(b)
Site of initial carboxylation
-
Mesophyll cells

(c)
Primary $C O_{2}$ acceptor
-
PEP

(d)
$C_{4}$ plant
-
Maize

(e)
Location of enzyme RuBisCO
-
Bundle sheath cells

Accepted Answer

PEP carboxylase catalyzes carboxylation of phosphoenolpyruvate (PEP, the primary acceptor of $CO_2$) to form four carbon compound oxaloacetate in mesophyll cells of $C_4$ plants. Initial carboxylation reaction of $C_4$ cycle takes place in mesophyll cell wherein oxaloacetate is converted into the intermediate malate. Malate is transported to bundle-sheath cell and is decarboxylated to produce pyruvate and $CO_2$. Rubisco present in bundle sheath cells then carries out fixation of released carbon dioxide. Maize is a $C_4$ with characteristic kranz anatomy consisting of mesophyll and bundle sheath cells. Thus, the correct answer is option A.

Question 4

How many organisms in the list given below are autotrophs?

Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia

A

Five

B

Six

C

Three

D

Four

Hard

View solution>

Accepted Answer

$\textbf{Correct Option B}$ $\textbf{Solution}$$\bullet$ Autotrophs are the organisms which are capable of manufacturing their own food with the help of photosynthesis or chemosynthesis.$\bullet$  Autotrophs are classified into two major groups namely: Photoautotrophs and chemoautotrophs. $\bullet$ Nostoc, Chara, Porphyra  and Wolffia are photo synthetic autotrophs as they obtain their food through photosynthesis. $\bullet$ Nitrosomonas and nitrobacter are chemosynthetic autotrophs because they make their own food using energy from chemical reactions. $\bullet$ From the rest organisms lactobacillus, Streptomyces and saccharomyces have heterotrophic mode of nutrition. While Trypanosoma is a parasitic organism. $\bullet$ So, only six of them are autotrophs. $\bullet$ So, the correct option is B.

Question 5

${C_{40} H_{56} O_4}$ is the chemical formula of

Accepted Answer

Carotenol is a yellow pigment. The chemical formula is C$_{40}H_{56}O_{2}$.Chlorophyll is a green pigment found in cyanobacteria and the chloroplasts of algae and plants. The chemical formula of chlorophyll a is C$_{55}H_{72}O_{5}N_{4}Mg$. The chemical formula of chlorophyll b ic C$_{55}H_{72}O_{6}N_{4}Mg$.Carotene is an orange photosynthetic pigment important for photosynthesis. The chemical formula is C$_{40}H_{56}$.So, the correct answer is option D.

Question 6

$C_{4}$ photosynthesis does not occur in

Accepted Answer

Plants exhibiting characteristic kranz anatomy are $C_4$ plants. Spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of $C_4$ plants respectively avoids photorespiration by concentrating $CO_2$ in bundle sheath cells to scale down the oxygenase activity of RUBISCO and increase the RUBISCO efficiency. Zea mays and Saccharum spp are $C_4$ plant while Euphorbia splendens is a CAM plant that reduces water loss by opening the stomata at night only. So, the correct answer is option D.

Question 7

The glycolate metabolism occurs in

Accepted Answer

Peroxisomes are small, membrane-enclosed organelles, that contain enzymes involved in a variety of metabolic reactions, including several aspects of energy metabolism. Phosphoglycolate is converted to glycolate and then transferred to peroxisomes, where it is oxidized and converted to glycine.

Question 8

Chloroplast contains maximum quantity of

Accepted Answer

RuBP-oxygenase is a form of Rubisco, which constitutes 16% of chloroplast protein. it is the most abundant protein on this planet.

Question 9

Photosynthesis consists of essentially two biological reaction systems, one followed by the other. The second of these systems do which of the following?

Accepted Answer

The photosynthesis is consists of two biological reaction systems are light dependent and light independent reactions. The CO$_2$ is fixed in this system.The plant uses light energy to generate NADPH and ATP. The chemical bonds in these compounds store the energy and are used during the light independent phase.The light independent phasen the ATP and NADPH generated in the light phase utilised to make C-C bonds of carbohydrates from carbon dioxide and water, with the RuBP. Six molecules of carbon dioxide enter the cycle, which in turn produces one molecule of glucose or sugar.So, the correct answer is option A.

Question 10

Photorespiration decreases net photosynthesis.

Accepted Answer

Rate of respiration in dark and light is almost same in all plants.

Photosynthesis In Higher Plants

Biology
9690 Views

In leaves, name the cell organelle and pigment that is responsible for green colour.

The ratio between 3- carbon and 2- carbon intermediates having - $N H_{2}$ group formed in photosynthetic oxidation cycle is

Select the incorrect matched pair with regard to $C_{4}$ cycle.

(a)
Primary $C O_{2}$ fixation product
-
PGA

(b)
Site of initial carboxylation
-
Mesophyll cells

(c)
Primary $C O_{2}$ acceptor
-
PEP

(d)
$C_{4}$ plant
-
Maize

(e)
Location of enzyme RuBisCO
-
Bundle sheath cells

How many organisms in the list given below are autotrophs?

Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia

$C_{40} H_{56} O_{4}$ is the chemical formula of

$C_{4}$ photosynthesis does not occur in

The glycolate metabolism occurs in

Chloroplast contains maximum quantity of

Photosynthesis consists of essentially two biological reaction systems, one followed by the other. The second of these systems do which of the following?

Photorespiration decreases net photosynthesis.

Rate of respiration in dark and light is almost same in all plants.

(a)	Primary $C O_{2}$ fixation product	-	PGA
(b)	Site of initial carboxylation	-	Mesophyll cells
(c)	Primary $C O_{2}$ acceptor	-	PEP
(d)	$C_{4}$ plant	-	Maize
(e)	Location of enzyme RuBisCO	-	Bundle sheath cells

Photosynthesis In Higher Plants

Biology 9690 Views

In leaves, name the cell organelle and pigment that is responsible for green colour.

The ratio between 3- carbon and 2- carbon intermediates having -NH2​ group formed in photosynthetic oxidation cycle is

Select the incorrect matched pair with regard to C4​ cycle. (a) Primary CO2​ fixation product - PGA (b) Site of initial carboxylation - Mesophyll cells (c) Primary CO2​ acceptor - PEP (d) C4​ plant - Maize (e) Location of enzyme RuBisCO - Bundle sheath cells

How many organisms in the list given below are autotrophs? Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia

C40​H56​O4​ is the chemical formula of

C4​ photosynthesis does not occur in

The glycolate metabolism occurs in

Chloroplast contains maximum quantity of

Photosynthesis consists of essentially two biological reaction systems, one followed by the other. The second of these systems do which of the following?

Photorespiration decreases net photosynthesis.

Rate of respiration in dark and light is almost same in all plants.

Biology
9690 Views

The ratio between 3- carbon and 2- carbon intermediates having - $N H_{2}$ group formed in photosynthetic oxidation cycle is

Select the incorrect matched pair with regard to $C_{4}$ cycle.

(a)
Primary $C O_{2}$ fixation product
-
PGA

(b)
Site of initial carboxylation
-
Mesophyll cells

(c)
Primary $C O_{2}$ acceptor
-
PEP

(d)
$C_{4}$ plant
-
Maize

(e)
Location of enzyme RuBisCO
-
Bundle sheath cells

How many organisms in the list given below are autotrophs?

Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia

$C_{40} H_{56} O_{4}$ is the chemical formula of

$C_{4}$ photosynthesis does not occur in