Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is an advantage of building dams?

  1. The dams disturbs aquatic life

  2. Dams lead go large scale disturbance of aquatic life

  3. It disturbs the natural ecosystem

  4. None
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The dams across the Rivers can disturb the aquatic life and can lead to their large scale destruction the fishes and other water animals may enter the power generation turbines where they may get crushed.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is not a disadvantage of building large dams for generating hydro electric power?

  1. Disturbance of the natural ecosystem in the surrounding forest area.

  2. Disruption of the plants and animals life.

  3. Displacement of people on a large scale.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The construction of dams for generating hydro electric power and then installation of transformers and their connection to the national grid has the following four main disadvantages:

A) Disturbance of the natural ecosystem in the surrounding forest area.

B) Disruption of the plants and animals life.

C) Displacement of people on a large scale.

D) Disruption of the aquatic ecosystem.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

Which of the following is / are disadvantage of building large dams for generating hydro electric power?

  1. Due to construction of dams, lot of areas of rivers having continuous fresh flowing water, have to be cleared.

  2. Number of trees have to be cut.

  3. Destroys not only the plants life but also the animals and birds life dependent on them.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The construction of dams for generating hydro electric power and then installation of transformers and their connection to the national grid has the following four main disadvantages:

A) disturbance of the natural ecosystem in the surrounding forest area.

B) disruption of the plants and animals life.

C) displacement of people on a large scale.

D) disruption of the aquatic ecosystem.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

At present, the contribution of hydroelectricity to the total power generation in India is

  1. A little more than $22$%
  2. A little more than $35$%
  3. A little more than $47$%

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydroelectricity typically accounts for about 10-12% of India's total power generation. The provided answer 'A little more than 22%' is likely outdated or refers to a different metric, but given the options, it is the standard choice in many older exam banks.

Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

How many of the given structures are associated with the thylakoid membrane?
PS II, RuBisCO, LHC, PEPcase, $F _0$ of ATP synthase, cytochromes b & f.

  1. $2$
  2. $3$
  3. $4$
  4. $5$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The structures associated with the thylakoid membrane are PS II, LHC, F0 of ATP synthase, and cytochromes b & f. RuBisCO is found in the stroma, and PEPcase is found in the cytoplasm of mesophyll cells, making a total of 4 structures.

Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Read the following statements.
i) Chloroplasts get aligned with their flat surface parallel to the cell walls to receive optimum light intensity.
ii) Water is the only electron donor in all photosynthetic organisms.
iii) ATP and NADPH are utilised in Carboxylation stage of Calvin cycle.
iv) Bundle sheath cells are characterized by having a large number of chloroplasts and impervious walls.
v) Law of limiting factors was proposed by Blackmann.
Which of the given statements are CORRECT?

  1. (i), (iii) and (iv)

  2. (i), (ii) and (iii)

  3. (iii), (iv) and (v)

  4. (v) only
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Which cellular part is correctly described

  1. Thylakoids - Flattened membranous sacs forming grana

  2. Centrioles - Sites for active RNA synthesis

  3. Ribosomes - Those in chloroplasts are larger (80 S) while those in cytoplasm are smaller (70 S)

  4. Lysosomes - Opimally active at 8.5 pH.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thylakoids are indeed flattened membranous sacs that stack to form grana. Centrioles are for spindle formation, not RNA synthesis. Chloroplast ribosomes are 70S, not 80S. Lysosomes are acidic (pH 5).

Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

The spaces inside the folds of ER membrane are known as

  1. Thylakoids

  2. Cisternae

  3. Mesosomes

  4. Periplasmic space
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The internal flattened sac-like compartments or spaces formed by the folds of the endoplasmic reticulum membrane are known as cisternae. Thylakoids belong to chloroplasts, and mesosomes are infoldings of the plasma membrane in bacteria.

Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Match the following

a. Bacteria 1. Synthesis and storage of lipids
b. Sphaerosomes 2. Idiogram
c. Chloroplasts 3. Glycocalyx
d. Karyotype 4. Thylakoids

  1. a-3, b-1, c-4, d-2

  2. a-3, b-1, c-2, d-4

  3. a-4, b-3, c-2, d-1

  4. a-1, b-2, c-3, d-4

  5. a-3, b-2, c-4, d-1.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacteria have glycocalyx (a-3). Sphaerosomes are involved in lipid storage (b-1). Chloroplasts contain thylakoids (c-4). Karyotype is represented by an idiogram (d-2).

Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Consider the following processes.
a. $O _2$ evolution
b. $CO _2$ fixation
c. NADPH formation
d. Chlorophyll biosynthesis.
Which of these do not occur in thylakoids?

  1. $1$ and $2$
  2. $2$ and $3$
  3. $3$ and $4$
  4. $2$ and $4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxygen evolution, NADPH formation, and light reactions occur in the thylakoids. CO2 fixation (Calvin cycle) occurs in the stroma, and chlorophyll biosynthesis involves multiple cellular compartments including plastids and cytoplasm, meaning 2 and 4 do not exclusively occur in thylakoids.