Biology (Railway)

Total Questions: 50

1. The test for diagnosing HIV is- [RRB NTPC (CBT) Stage-I Exam, 30.03.2016 Shift-III]

(A) Pap Smear

(B) ELISA

(D) Mantoux

(1) C
(2) B
(3) D
(4) A

Correct Answer: (2) B

Solution:A series of blood screenings are performed to test for HIV. The Enzyme-Linked Immunosorbent Assay (ELISA), also known as an enzyme immunoassay (EIA), is the first test required to screen for HIV. ELISA, like the Western blot test, detects HIV antibodies in blood.

2. In human body, pancreas is a part of the- [RRB NTPC (CBT) Stage-I Exam, 31.03.2016 Shift-I]

(A) Excretory system

(B) Respiratory system

(D) Nervous system

(1) C
(2) D
(3) A
(4) B

Correct Answer: (1) C

Solution:Pancreas is a glandular organ in the digestive system and endocrine system of vertebrates. In humans, it is located in the abdominal cavity behind the stomach. As a digestive organ, it secretes pancreatic juice containing digestive enzymes that assist digestion and absorption of nutrients in the small intestine.

3. Contraceptives tablates contains _________ [NTPC (CBT) Stage-I Exam, (11-04-2016 (Shift-I)]

(A) Only Progesterone

(B) Only Estrogen

(D) Neither Progesterone nor Estrogen

(1) B
(2) A
(3) C
(4) D

Correct Answer: (3) C

Solution:Contraceptive tablates contain both estrogen and progesterone harmones.

4. Which of the following is not used as a fruit? [RRB NTPC CBT Stage-I Exam. 19.04.2016 Shift-I]

(A) Tomato

(B) Strawberry

(D) Grapes

(1) D
(2) B
(3) C
(4) A

Correct Answer: (4) A

Solution:Though we technically eat the fruit of the tomato plant. it is used as a vegetable in eating and cooking and, thus, usually categorized in vegetables. The tomato is the edible, often red berry-type fruit of the nightshade Solanum lycopersicum, commonly known as a tomato plant.

5. Insectivorous plants grow on soil which is deficient in [RRB NTPC CBT Stage-I Exam, 19.04.2016 Shift-I]

(A) Nitrogen

(B) Carbon

(D) Potassium

(1) B
(2) C
(3) D
(4) A

Correct Answer: (4) A

Solution:Insectivorous plants generally grow in nitrogen deficient soils. So to obtain nitrogen they attract insects. The capture of insects provides them with a supplemental source of nitrogen and potassium. Insect bodies contain a little over 10 percent nitrogen that is enough for their nitrogen needs.

6. What are the receptors for detecting taste called? [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) Sensory receptors
(2) Chemical receptors
(3) Olfactory receptors
(4) Gustatory receptors

Correct Answer: (4) Gustatory receptors

Solution:Gustatory receptors detect taste and Olfactory receptors detect smell. The receptors for gustation are located in the oral cavity, which brings food and fluids from outside the body into the gastrointestinal tract. Taste buds work in concert with oral thermal and tactile receptors to evaluate these substances.

7. ____________forms a common passage for both urine and sperms in human males. [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) Oviduct
(2) Ureter
(3) Urethra
(4) Vas deferens

Correct Answer: (3) Urethra

Solution:The male urethra is approximately 18-20 cm long; it extends from the internal orifice of the urinary bladder to the external opening at the end of the penis. The urethra allows the passage of both urine and sperm.

8. What is a tissue? [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) Cells which are similar in origin, but dissimilar in form and function
(2) Cells which are dissimilar in origin, but are similar in form and function
(3) Cells which are dissimilar in origin, form and function
(4) Cells which are similar in origin, form and function

Correct Answer: (4) Cells which are similar in origin, form and function

Solution:A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues. There are four kinds of tissues based on differences in their anatomy and function: epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

9. Identify a type of a sexual reproduction which involves reproduction through parts of a plant such as roots, stem and leaves? [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) Budding
(2) Vegetative propagation
(3) Fragmentation
(4) Fission

Correct Answer: (2) Vegetative propagation

Solution:Vegetative propagation is a form of a sexual reproduction of a plant. Only one plant is involved and the off-spring is the result of one parent. The new plant is genetically identical to the parent. For plants such as onions, garlic, tulip, daffodil. and hyacinth, the bulb is the unit of vegetative propagation.

10. In which of the flowering plants are buds produced in the notches along the leaf margin? [RRB ALP & Technician Exam, 10.08.2018 Shift-I]

(1) Bryophyta
(2) Bryophyllum
(3) Banana
(4) Rose

Correct Answer: (2) Bryophyllum

Solution:In bryophyllum, the buds are produced in the notches along the leaf margin. This helps in the production of new plants-a kind of vegetative reproduction. The leaf buds gradually develop some roots called adventitious roots. When leaves bearing these leaf buds fall down and the roots touch the soil, new and individual plants grow from the buds.

12 3 4 5 Next »