Biology Test 319

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Biology Test 319

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Weekly Quiz Competition

Question 1
4 / -1

Among the following organisms which is a completely non-parasitic form?

A
Sea anemone

B
Tapeworm

C
Leech

D
Mosquito

Solution

Sea anemone is not parasitic. It shows mutualism with hermit crab. Tapeworm is an endoparasite while leech and mosquito are exoparasites.
Question 2
4 / -1

The type of symmetry in the given animals is

A
Bilateral, Asymmetrical

B
Bilateral, Bilateral

C
Radial, Bilateral

D
Radial, Radial

Solution

Figure 'A' is of Hydra which has radial symmetry and figure 'B' is of Cancer (crab) which has bilateral symmetry.
Question 3
4 / -1

Directions For Questions

Consider the following statements (A - C) each with two blanks.

A. Animals like Hydra and Jelly fish depict (i) symmetry whereas all vertebrates show (ii) symmetry.

B. In fiii) and (iv) digestive tract has only sngle opening (mouth) and is said to be incomplete.

C. Trichinella (Trichina worm) is a cosmopolitan (v) parasite whereas Fasciola (liver fluke) lives in the ducts of the liver of (vi)

...view full instructions

Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) to (vi) in the statements?

A
(i)-bilateral, (ii)-radial, (v)-snail, (vi)-human

B
(iii)-Porifera, (iv)-Pisces, (v)-human, (vi)-sheep

C
(i)-radial, (ii)-bilateral, (iii)-Coelenterata, (iv)-Platyhelminthes

D
(iii)-Amphibia, (iv)-Annelida, (v)-mosquito, (vi)-human

Solution

In animals like Hydra, jelly fish, star fish, the body can be divided into equal halves by any plane passing through the centre from top to bottom, thus exhibiting radial symmetry. In many vertebrates body can be divided into two equal halves by a single plane only thus exhibiting bilateral symmetry.

In the blind sac body plan the body has a single cavity with one opening to the outside. The single opening functions as both mouth for ingestion and anus for egestion. It is found in coelenterates and flatworms (Platyhelminthes).
Question 4
4 / -1

Read the given statements and select the correct option.

Statement 1: All triploblastic animals are eucoelomates.

Statement 2: They have a false coelom.

A
Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is correct and statement 2 is incorrect.

D
Both statements 1 and 2 are incorrect.
Solution
- Animals that belong to the phylum Platyhelminthes to Chordata are all triploblastic.
- But Platyhelminthes and aschelminthes belong to pseudocoelomates.
- Annelids, arthropods, echinoderms and chordates are under eucoelomates. This means not all triploblastic animals are eucoelomates.
- Pseudocoelomates have false coelom while eucoelomate animals only have the true coelom.
Hence, both statement 1 and statement 2 are incorrect.
Question 5
4 / -1

Which of the following statements is incorrect with regard to bilateral symmetry?

A
Body can be divided into two equal halves by a single plane only.

B
The organisms that show bilateral symmetry have paired body organs that occur on the two sides of a central axis.

C
It is found in all invertebrates and few vertebrates.

D
Spider and crab show bilateral symmetry.

Solution

Bilateral symmetry is defined as the symmetry in which animals can be divided into two halves in one plane only, and these halves are identical to each other. The organisms have paired body organisms that occur on both sides of the body; if this will not happen then the symmetry will no longer remain. This type of symmetry is found in all vertebrates and few invertebrates. Some invertebrates also show radial symmetry, for example, animals belonging to coelenterates, ctenophores and echinoderms. These organisms can be divided into two identical haves through any plane passing through the central axis. So, the incorrect statement regarding bilateral symmetry is option C.
Question 6
4 / -1

Examine the figures of diploblastic (i) and triploblastic (ii) organization in animals given below and identify the labelled parts A to D.

A
A - Mesoglea, B - Ectoderm, C - Endoderm, D - Mesoderm

B
A - Endocdern, B - Mesoderm, C - Mesoglea, D - Ectodderm

C
A - Mesoderm, B - Mesoglea, C - Ectoderm, D - Endoderm

D
A - Ectoderm, B - Endoderm, C - Mesoglea, D - Mesoderm

Solution

A - Ectoderm
B - Endoderm
C - Mesoglea
D - Mesoderm

So, the correct answer is 'A - Ectoderm, B - Endoderm, C - Mesoglea, D - Mesoderm'.
Question 7
4 / -1

The synthesis of complex organic substances from simple inorganic raw materials in the presence of sunlight and chlorophyll is called ..........., which is a ............ process.

A
Photosynthesis, anabolic

B
Photosynthesis, catabolic

C
Respiration, anabolic

D
Respiration, catabolic

Solution

Photosynthesis is an enzyme regulated anabolic process which involves the synthesis of organic compounds, inside the chlorophyll containing cells, from CO₂ and H₂O with the help of sunlight as a source of energy. Oxygen evolved during photosynthesis comes from water. The equation for photosynthesis can be summarised as follows.
Question 8
4 / -1

Visible part of electromagnetic spectrum consists of radiations having a wavelength in the range of

A
400−800nm

B
300−2600nm

C
390−760nm

D
650−760nm

Solution

Light is the visible part of electomagnetic radiations. Visible light consists of radiations having a wavelength between 390-760 nm (or 399-430nm), blue of indigo (430-470nm), blue green or blue (470-500nm), green (500-580nm), yellow (580-600nm), orange (600-650nm), orange red (650-600nm) and red (660-760nm).
Question 9
4 / -1

Which reaction in the Calvin cycle is catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA?

A
Carboxylation

B
Reduction

C
Regeneration

D
PEP carboxylase
Solution
- Carboxylation is the fixation of CO₂ into a stable organic intermediate.
- Carboxylation is the most crucial step of the Calvin cycle where CO₂ is utilised for the carboxylation of RuBP.
- This reaction is catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA.
- Since this enzyme also has an oxygenation activity, it would be more correct to call it RuBP carboxylase-oxygenase or RuBisCO.
Question 10
4 / -1

Which of the following statements are true about photosynthesis?

A. In this process, solar energy is converted into chemical energy.

B. In photosynthesis, CO₂ and H₂O are used.

C. In photosynthesis, CO₂ is released and O₂ is consumed.

D. In photosynthesis, O₂ is released and carbon monoxide is consumed.

A
A and B

B
B and C

C
C and D

D
A and D

Solution

Both statements (A) and (B) are correct about photosynthesis reaction.

A. In this process, solar energy is converted into chemical energy.

B. In photosynthesis, CO₂ and H₂O are used to give glucose and oxygen in the presence of sunlight with the help of green pigment chlorophyll.

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Biology Test 319

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Biology Test 319

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Question 1

Sea anemone

Tapeworm

Leech

Mosquito

Solution

Question 2

Bilateral, Asymmetrical

Bilateral, Bilateral

Radial, Bilateral

Radial, Radial

Solution

Question 3

(i)-bilateral, (ii)-radial, (v)-snail, (vi)-human

(iii)-Porifera, (iv)-Pisces, (v)-human, (vi)-sheep

(i)-radial, (ii)-bilateral, (iii)-Coelenterata, (iv)-Platyhelminthes

(iii)-Amphibia, (iv)-Annelida, (v)-mosquito, (vi)-human

Solution

Question 4

Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

Statement 1 is correct and statement 2 is incorrect.

Both statements 1 and 2 are incorrect.

Solution

Question 5

Body can be divided into two equal halves by a single plane only.

The organisms that show bilateral symmetry have paired body organs that occur on the two sides of a central axis.

It is found in all invertebrates and few vertebrates.

Spider and crab show bilateral symmetry.

Solution

Question 6

A - Mesoglea, B - Ectoderm, C - Endoderm, D - Mesoderm

A - Endocdern, B - Mesoderm, C - Mesoglea, D - Ectodderm

A - Mesoderm, B - Mesoglea, C - Ectoderm, D - Endoderm

A - Ectoderm, B - Endoderm, C - Mesoglea, D - Mesoderm

Solution

Question 7

Photosynthesis, anabolic

Photosynthesis, catabolic

Respiration, anabolic

Respiration, catabolic

Solution

Question 8

400−800nm

300−2600nm

390−760nm

650−760nm

Solution

Question 9

Carboxylation

Reduction

Regeneration

PEP carboxylase

Solution

Question 10

A and B

B and C

C and D

A and D

Solution

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