Mix Test

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Mix Test - 2

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Question 1
1 / -0

Tube feet are the locomotory organs of

A
spider

B
catfish

C
reptiles

D
starfish

Solution

Tube feet are small active tubular projections on the oral face of an echinoderm, whether the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers. They are part of the water vascular system. They function in locomotion, feeding, and respiration. The tube feet in a starfish are arranged in grooves along the arms. They operate through hydraulic pressure. They are used to pass food to the oral mouth at the center, and can attach to surfaces.
Question 2
1 / -0

Label the following diagram and choose the correct option.

A
A – Pancreas, B – Gall bladder, C – Duodenum, D – Bile duct

B
A – Gall bladder, B – Duodenum, C – Pancreas, D – Bile duct

C
A – Duodenum, B – Bile duct, C – Gall Bladder, D – Pancreas

D
A – Pancreas, B – Gall Bladder, C – Bile duct, D – Duodenum

Solution

A – Pancreas, B – Gall bladder, C – Duodenum, D – Bile duct
Question 3
1 / -0

The foramen present in the heart of a crocodile is

A
foramen of Panizza

B
foramen of Luschka

C
foramen of Magendie

D
foramen of Rotunda

Solution

The foramen of Panizza is a hole that connects the left and right aorta as they leave the heart of all animals of the order Crocodilia. Crocodilians have a completely separated ventricle with deoxygenated blood from the body, or systemic circulation, in the right ventricle and oxygenated blood from the lungs, or pulmonary circulation, in the left ventricle, as in birds and mammals.
Question 4
1 / -0

Enamel of teeth is a/an

A
epithelial tissue

B
connective tissue

C
muscular tissue

D
nervous tissue

Solution

Enamel is secreted from ameloblasts, which are derived from oral epithelium tissue of ectodermal origin. The cells that make enamel develop from the invagination of epithelial tissue during fetal development.

Question 5

1 / -0

Match the following:

(a) Chromatid lengthens, becomes thinner and forms a network of chromatin fibres.	(i) Anaphase
(b) Chromosomes are lined up in one plate at the equator.	(ii) Telophase
(c) Nuclear membrane and nucleolus disappear.	(iii) Metaphase
(d) Furrow starts in the cell membrane in the middle of an animal cell.	(iv) Prophase

(a) – (i), (b) – (ii), (c) – (iii), (d) – (iv)

(a) – (ii), (b) – (iii), (c) – (i), (d) – (iv)

(a) – (iii), (b) – (iv), (c) – (i), (d) – (ii)

(a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)

Solution

(a) Chromatid lengthens, becomes thinner and forms a network of chromatin fibres.	(ii) Telophase
(b) Chromosomes are lined up in one plate at the equator.	(iii) Metaphase
(c) Nuclear membrane and nucleolus disappear.	(iv) Prophase
(d) Furrow starts in the cell membrane in the middle of an animal cell.	(i) Anaphase

Mitosis is the process that allows cells to reproduce and copy themselves, by copying the DNA of the cell and creating two separate sets of chromosomes. Mitosis is usually divided into four phases: prophase, metaphase, anaphase, and telophase. Due to its long length sometimes prophase is broken into two phases distinct phases: prophase, and prometaphase.

Question 6
1 / -0

Trichomes are characteristic of

A
epidermis

B
hypodermis

C
cortex

D
endodermis

Solution

Trichomes are fine outgrowths or appendages on plants, algae, lichens, and certain protists. They are of diverse structure and function. Trichomes on plants are epidermal outgrowths of various kinds.
Question 7
1 / -0

Directions: Read the statements given below (Assertion and Reason) and choose the correct option accordingly.

Assertion (A): Placenta is a special mammalian structure through which the exchange of materials between foetal and maternal circulation occurs.
Reason (R): Placental hormones are required for the establishment and maintenance of pregnancy.

A
Both A and R are true and R is the correct explanation of A.

B
Both A and R are true, but R is not the correct explanation of A.

C
A is true and R is false.

D
Both A and R are false.

Solution

The placenta is a temporary organ that connects the developing fetus via the umbilical cord to the uterine wall to allow nutrient uptake, thermo-regulation, waste elimination, and gas exchange via the mother's blood supply; to fight against internal infection; and to produce hormones which support pregnancy.
Placenta produces hormones like (hCG), progesterone, estrogen and human placental lactogen (hPL). These hormones help in the establishment and maintenance of pregnancy.
Question 8
1 / -0

Which hormone induces bolting and flowering?

A
Gibberellins

B
Auxins

C
Cytokinin

D
Abscissic acid

Solution

Bolting is the production of a flowering stem (or stems) on agricultural and horticultural crops before the crop is harvested, in a natural attempt to produce seeds and reproduce. Bolting is induced by plant hormones of the gibberellin family and can occur as a result of several factors, including changes in day length, prevalence of high temperatures at particular stages in a plant's growth cycle, and existence of stresses, such as insufficient water or minerals.
Question 9
1 / -0

Which of the following descriptions of a gland is correct?

A
Thyroid: Hyperactivity in young children causes cretinism

B
Thymus: Starts undergoing atrophy after puberty

C
Parathyroid: Secretes hormone that regulates Mg²⁺ concentration

D
Pancreas: Secretion of delta cells stimulates glycolysis in liver

Solution

As the thymus shrinks, its tissues are replaced by adipose tissue. The shrinking is due to the reduced role of the thymus in adulthood. Before birth and throughout childhood, the thymus is instrumental in the production and maturation of T-lymphocytes or T cells. At puberty, the thymus starts to slowly shrink and become replaced by fat.
Question 10
1 / -0

Which of the following options is commonly known as 'pond scum'?

A
Ulothrix

B
Marchantia

C
Nostoc

D
Spirogyra

Solution

Spirogyra is commonly known as 'pond scum'.
Question 11
1 / -0

Fluid mosaic model was proposed by

A
J. David Robertson

B
Danielli and Davson

C
Singer and Nicolson

D
Nageli and Cramer

Solution

Fluid mosaic model was proposed by Singer and Nicolson.
The fluid mosaic model describes the plasma membrane structure as a mosaic of phospholipids, cholesterol, proteins, and carbohydrates.
Question 12
1 / -0

When more than one codon designates the same amino acid, it is referred to as

A
overlapping of codons

B
degeneracy of codons

C
universality of codons

D
None of the above

Solution

Although each codon is specific for only one amino acid (or one stop signal), the genetic code is described as degenerate, or redundant, because a single amino acid may be coded for by more than one codon. Except for methionine and tryptophan, all amino acids have multiple codons.

Question 13

1 / -0

Match the following:

Pathogens	Diseases
(i) Protozoa	(A) Syphilis
(ii) Worms	(B) Filaria
(iii) Viruses	(C) Malaria
(iv) Bacteria	(D) Poliomyelitis

(i) – (A), (ii) – (B), (iii) – (D), (iv) – (C)

(i) – (C), (ii) – (B), (iii) – (D), (iv) – (A)

(i) – (D), (ii) – (B), (iii) – (C), (iv) – (A)

(i) – (A), (ii) – (C), (iii) – (D), (iv) – (B)

Solution

Pathogens	Diseases
(i) Protozoa	(C) Malaria
(ii) Worms	(B) Filaria
(iii) Viruses	(D) Poliomyelitis
(iv) Bacteria	(A) Syphilis

Question 14
1 / -0

Dictyosomes are the other name for:

A
golgi bodies

B
Lysosomes

C
Mitochondria

D
Endoplasmic reticulum

Solution

Golgi bodies are often called as dictyosomes in plants.
Question 15
1 / -0

Presence of notochord, dorsal tubular nerve cord and pharyngeal slits are the three important characters of phylum Chordata. In which of the following chordates are all the three characters present in the adult form?

A
Doliolum

B
Oikopleura

C
Branchiostoma

D
Herdmania

Solution

Presence of notochord, dorsal tubular nerve cord and pharyngeal slits are the three important characters of phylum Chordata. In Branchiostoma, all the three characters are present in the adult form. Chordates are coelomate and show an organ system level of organisation. They are bilaterally symmetrical and triploblastic.

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Mix Test - 2

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Mix Test - 2

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Question 1

spider

catfish

reptiles

starfish

Solution

Question 2

A – Pancreas, B – Gall bladder, C – Duodenum, D – Bile duct

A – Gall bladder, B – Duodenum, C – Pancreas, D – Bile duct

A – Duodenum, B – Bile duct, C – Gall Bladder, D – Pancreas

A – Pancreas, B – Gall Bladder, C – Bile duct, D – Duodenum

Solution

Question 3

foramen of Panizza

foramen of Luschka

foramen of Magendie

foramen of Rotunda

Solution

Question 4

epithelial tissue

connective tissue

muscular tissue

nervous tissue

Solution

Question 5

(a) – (i), (b) – (ii), (c) – (iii), (d) – (iv)

(a) – (ii), (b) – (iii), (c) – (i), (d) – (iv)

(a) – (iii), (b) – (iv), (c) – (i), (d) – (ii)

(a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)

Solution

Question 6

epidermis

hypodermis

cortex

endodermis

Solution

Question 7

Both A and R are true and R is the correct explanation of A.

Both A and R are true, but R is not the correct explanation of A.

A is true and R is false.

Both A and R are false.

Solution

Question 8

Gibberellins

Auxins

Cytokinin

Abscissic acid

Solution

Question 9

Thyroid: Hyperactivity in young children causes cretinism

Thymus: Starts undergoing atrophy after puberty

Parathyroid: Secretes hormone that regulates Mg2+ concentration

Pancreas: Secretion of delta cells stimulates glycolysis in liver

Solution

Question 10

Ulothrix

Marchantia

Nostoc

Spirogyra

Solution

Question 11

J. David Robertson

Danielli and Davson

Singer and Nicolson

Nageli and Cramer

Solution

Question 12

overlapping of codons

degeneracy of codons

universality of codons

None of the above

Solution

Parathyroid: Secretes hormone that regulates Mg²⁺ concentration