Biology Test 143

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Biology Test 143

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Weekly Quiz Competition

Question 1
4 / -1

C₃ plants show saturation at about which of the following concentrations of CO₂?

A
360 μlL^-1

B
400 μlL^-1

C
450 μlL^-1

D
None of the above

Solution

An increase in CO₂ concentration of up to 0.05 percent can cause an increase in CO₂ fixation rates, beyond this, the levels can become damaging over longer periods.

C₄ plants show saturation at about 360 μlL^-1 while C₃ responds to increased CO₂concentration and saturation is seen only beyond 450 μlL^-1.
Hence, the correct option is (C).
Question 2
4 / -1

Which of the following is incorrect about sexual reproduction?

A
Involvement of single or two individuals

B
Production of male and female gametes

C
External fertilization is a rule during sexual reproduction

D
Development of zygote into a new organism

Solution

Sexual reproduction does not require two individuals because the usion of two gametes released from the same plant can take place.

Sexual reproduction is a process where gametic fusion is present because takes place between two gametes of different sexes.

External fertilization need not takes place in sexual reproduction. it can also be internal.

Hence, the correct option is (C).
Question 3
4 / -1

The occurrence of more than four spores from a spore mother cell is called

A
Polygamy

B
Polyspermy

C
Polyspory

D
Polyembryony

Solution

Each microspore mother cell divides meiotically to form four haploid microspores or pollen grains and remains arranged in tetrads. So one meiosis produces one pollen. Sometimes more than four pollens are produced from one microspore mother cell. It is called polyspory.

Hence, the correct option is (C).
Question 4
4 / -1

B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein and exist as inactive protoxins, but once an insect ingests the inactive toxin, it is converted into an active form of toxin. This is due to __________.

A
The acidic pH of the gut, which solubilizes the crystals

B
The neutral pH of the gut, which solubilizes the crystals

C
The alkaline pH of the gut, which solubilizes the crystals

D
The alkaline pH of the respiratory tract, which solubilizes the crystals

Solution

B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein and exist as inactive protoxins, but once an insect ingests the inactive toxin, it is converted into an active form of toxin. This is due to the alkaline pH of the gut, which solubilizes the crystals.

Hence, the correct option is (C).
Question 5
4 / -1

Dentition in man is said to be thecodont because

A
There are two sets of teeth

B
There are different types of teeth

C
Root and crown are distinct

D
Teeth are set in sockets

Solution

Because human teeth are set in sockets and have all of the characteristic that's why their dentition refers to as thecodont, heterodont and diphyodont.

Hence, the correct option is (D).
Question 6
4 / -1

The protein molecule present in haemoglobin is

A
Thrombin

B
Fibrinogen

C
Globulin

D
Casein

Solution

The name hemoglobin is derived from the words heme and globulin, reflecting the fact that each subunit of hemoglobin is a globular protein with an embedded heme group. Each heme group contains one iron atom, that can bind one oxygen molecule through ion-induced dipole forces.

Hence, the correct option is (C).
Question 7
4 / -1

While playing basketball, Amit hurt his thumb. In the X-ray, it was confirmed that the carpal-metacarpal joint of the thumb was fractured. The carpal-metacarpal joint of the thumb is an example of ____________.

A
Saddle joints

B
Hinge joints

C
Ball and socket joints

D
Pivot joints

Solution

The carpometacarpal (CMC) of the thumb is a saddle joint that permits a wide range of motion and is largely responsible for the characteristic dexterity of human prehension. This joint, located at the very base of the thumb, is subject to large physical stresses throughout life.

Hence, the correct option is (A).
Question 8
4 / -1

Which of the following male sex, organs makes sperms?

A
Scrotal sac

B
Epididymis

C
Testes

D
Seminal vesicles

Solution

Most men have two testes. The testes are responsible for making testosterone, the primary male sex hormone, and for producing sperm. Within the testes are coiled masses of tubes called seminiferous tubules. These tubules are responsible for producing the sperm cells through a process called spermatogenesis.

Hence, the correct option is (C).
Question 9
4 / -1

Which one of the following elements is considered as a 'micronutrient' in plants?

A
P

B
Mg

C
Ca

D
Zn
Solution
Only a few elements have been found to be absolutely essential for plant growth and metabolism. These elements are further divided into two broad categories based on their quantitative requirements: (i) Macronutrients, and (ii) Micronutrients.

Macronutrients are generally present in plant tissues in large amounts.
- The macronutrients include carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorous (P), sulphur (S), potassium (K), calcium (Ca) and magnesium (Mg).
- Of these, carbon, hydrogen and oxygen are mainly obtained from CO₂ and H₂O, while the others are absorbed from the soil as mineral nutrition.
Micronutrients or trace elements are needed in very small amounts.
- These include iron, manganese (Mn), copper (Cu), molybdenum (Mo), zinc (Zn), boron (B), chlorine (CI) and nickel (Ni).
Hence, the correct option is (D).
Question 10
4 / -1

Accessory pigments transfer their energy to chlorophyll molecules through

A
Fluorescence

B
Resonance

C
Radiation

D
Transduction

Solution

Photosynthetic pigments including chlorophyll b,c,d, and e; carotenoids, and phycobilins are called accessory pigments because they do not directly take part in the photochemical act. They absorb specific wavelengths of light and transfer energy finally to chlorophyll through electron spin resonance.

Hence, the correct option is (B).

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Biology Test 143

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Biology Test 143

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SHARING IS CARING

Question 1

360 μlL-1

400 μlL-1

450 μlL-1

None of the above

Solution

Question 2

Involvement of single or two individuals

Production of male and female gametes

External fertilization is a rule during sexual reproduction

Development of zygote into a new organism

Solution

Question 3

Polygamy

Polyspermy

Polyspory

Polyembryony

Solution

Question 4

The acidic pH of the gut, which solubilizes the crystals

The neutral pH of the gut, which solubilizes the crystals

The alkaline pH of the gut, which solubilizes the crystals

The alkaline pH of the respiratory tract, which solubilizes the crystals

Solution

Question 5

There are two sets of teeth

There are different types of teeth

Root and crown are distinct

Teeth are set in sockets

Solution

Question 6

Thrombin

Fibrinogen

Globulin

Casein

Solution

Question 7

Saddle joints

Hinge joints

Ball and socket joints

Pivot joints

Solution

Question 8

Scrotal sac

Epididymis

Testes

Seminal vesicles

Solution

Question 9

P

Mg

Ca

Zn

Solution

Question 10

Fluorescence

Resonance

Radiation

Transduction

Solution

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360 μlL^-1

400 μlL^-1

450 μlL^-1