Tag: biology

Questions Related to biology

Choose the correct answer from the alternatives given.
Which of the following lights is the most effective in phototropism?

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Red

  2. Far-red

  3. Blue`

  4. Green

Show answer
Correct Option: C

Centromere is a part of chromosome which helps in the 

biology life processes in living organism movements in plants coordination in plants tropic and nastic movements in plants

  1. Division of centrosomes

  2. Formation of spindle fibres

  3. Movement of chromosomes

  4. Formation of nuclear spindle

Show answer
Correct Option: C
Explanation:

Centromere joins the microtubules of 'Chromosomal spindle fibres and helps in the movement of chromosome during cell division. Centromere also plays an important role in the polymerization of tubulin protein used in the formation of microtubules. Hence it is helpful in attaching the chromosome with spindle fibres.

Locomotion is a very important feature in animals.Considering the frequent need for locomotion in animals ,an animals would obtain the greatest benefit from storing its energy as 

biology life processes in living organism movements in plants coordination in plants tropic and nastic movements in plants

  1. Proteins

  2. minerals

  3. Carbohydrates

  4. Fats

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Correct Option: A

Which foramen is paired in mammalian brain ?

biology life processes in living organism movements in plants coordination in plants tropic and nastic movements in plants

  1. Foramen of Monro

  2. Foramen of Magendie

  3. Interventricular foramen

  4. Foramen of Luschka

Show answer
Correct Option: D

Which cranial nerve is present in Rabbit but absent in frog?

biology life processes in living organism movements in plants coordination in plants tropic and nastic movements in plants

  1. Glossopharyngeal

  2. Hypoglossal

  3. Olfactory

  4. Optic

Show answer
Correct Option: B

Consider the following statements each with two blanks.
(A) Seminiferous tubules produce (i) while Leydig's cells produce (ii).
(B) In females, urethra is small and conducts (iii) while in males it conducts urine and (iv).
(C) The process Of formation of spermatozoa from spermatogonia is called (v) and the process of maturation of spermatids into spermatozoa is called (vi).
Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) to (vi) in the statements?

biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. (i)-spermatozoa, (ii)-testosterone,

    (v)-spermatogenesis, (vi)-spermiogenesis

  2. (i)-testosterone, (ii)-spermatozoa, (iii)-urine, (iv)-semen

  3. (i)-estrogen, (ii)-testosterone, (v)-spermiogenesis, (vi)-spermatogenesis

  4. (iii)-urine, (iv)-semen, (v)-spermiogenesis, (vi)-spermatogenesis

Show answer
Correct Option: A
Explanation:

The seminiferous tubules are the location of the production of spermatozoa or sperms in the testicular lobule. The Leydig cells (interstitial cells) outside the seminiferous tubule synthesize and secrete testicular hormones called androgens or testosterone. Spermatogenesis is the process of immature male germ cells (spermatogonia) develop into mature sperms or spermatozoa. After this process, the conversion of the four equal haploid spermatids into spermatozoa (sperms) is called spermiogenesis. 

So, the correct option is '(i)-spermatozoa, (ii)-testosterone, (v)-spermatogenesis, (vi)-spermiogenesis'.

In frogs, body proportions do not change with their growth. A frog  that is twice as long as another will be  heavier by approximately ?

biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. Two-fold

  2. Six-fold

  3. Four-fold

  4. Eight-fold

Show answer
Correct Option: A
Explanation:

In frogs, body proportions do not change with their growth. This means that the weight and height of a frog increase and decrease proportionately. If one of these parameters increase, so does the other, and by the same proportion, and vice-versa. Hence, if a frog is twice as long as another, it will be approximately two times heavier also.

So, the correct answer is 'Two-fold'.

The graph of electrical activity of heart versus time produced by non-invasive medical procedure is called 

biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. Electro - cardiograph

  2. Electro - encephalograph

  3. Electro - cardiogram

  4. Electro - cardiography

Show answer
Correct Option: A
Explanation:

The graph of electrical activity of heart versus time produced by non-invasive medical procedure is called electrocardiograph. The process of recording the electrical activity of heart over a period of time is called as electrocardiography (ECG). The graph of electrical activity of brain versus time is called as electroencephalograph. The machine used to record the electrical activity of heart is called as electrocardiogram.

Thus, the correct answer is 'Electro - cardiograph.'

Match column I with column II and select the correct option from the codes given.

Column I Column II
A. Testis (i) Pigmentation
B. Ovaries (ii) Atrophies in adult
C. Thymus (iii) Estrogen
D. Melanin (iv) Testosterone
biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. A-(iii), B-(iv), C-(i), D-(ii)

  2. A-(ii), B-(iii), C-(iv), D-(i)

  3. A-(iv), B-(iii), C-(ii), D-(i)

  4. A-(i), B-(iv), C-(ii), D-(iii)

Show answer
Correct Option: C
Explanation:
Testosterone is released from testis.
Estrogen is released by ovaries.
In the case of the thymus, the atrophy in an adult is observed.
Melanin is the reason for pigmentation.
So, the correct option is 'A-(iv), B-(iii), C-(ii), D-(I)'

Number of fine outgrowths present on the surface of roots are called ____

biology identifying the plants absorption of water from the soil root system the root system

  1. root nodes

  2. rootlets

  3. root hairs

  4. tap root

Show answer
Correct Option: C
Explanation:

  • The epidermal cells of the roots give out fine hair-like outgrowths called the root hairs that absorb water and minerals

So, the correct answer of 'root hairs'