Biology (Part-2) (CDS-Solved Paper)

Total Questions: 50

21. Which of the following cells do not contain nucleus? [Evening Shift-2016 (II)]

1. Root hair cells
2. Red blood cells
3. Platelets
4. Monocytes
Select the correct answer using the code given below

Correct Answer: (b) 2 and 3
Solution:

Option (b) is correct that RBCs and platelets do not contain nucleus. The Red Blood Cells (RBCs) upon maturity looses its nucleus in order to increase its cellular surface area for gaseous exchange. Likewise platelets are also non-nucleated fragments of cytoplasm.

22. Biological catalysts are protein molecules which [Evening Shift-2016 (II)]

Correct Answer: (b) 1, 2 and 3
Solution:

Biological catalysts are enzymes and soluble protein molecules that can speed up chemical reactions in cells. These reactions includes respiration, photosynthesis and making new proteins. They remain unchanged after reaction and work efficiently at optimum temperature, i.e. 37°C.

23. ‘Altitude sickness’ is caused at high altitude due to [Evening Shift-2016 (II)]

Correct Answer: (b) low partial pressure of oxygen
Solution:

Altitude sickness is caused at high altitude due to low partial pressure of oxygen. There are three types of altitude sickness, i.e. acute altitude or mountain sickness, high altitude pulmonary oedema and high altitude cerebral oedema.

24. Which one of the following is considered as ‘good cholesterol’ with reference to individuals facing the risk of cardio-vascular diseases and hypertension? [Morning Shift-2016 (I)]

Correct Answer: (a) High Density Lipoprotein (HDL)
Solution:

HDL is also known as ‘good cholesterol’ present in our body because they can transport fat molecules out of artery walls and help in reducing the cardio-vascular diseases.

25. Which of the following pairs of vitamin and disease is/are correctly matched? [Morning Shift-2016 (I)]

1. Vitamin-A : Rickets
2. Vitamin-B₁ : Beri-beri
3. Vitamin-C : Scurvy
Select the correct answer using the codes given below:

Correct Answer: (b) 2 and 3
Solution:

Deficiency of vitamin-B1 causes beri-beri disease, which affects peripheral nervous system and cardio vascular system. Deficiency of vitamin-C causes scurvy. Vitamin-C helps in synthesis of collagen fibre. Bleeding gums are caused due to its deficiency. Deficiency of vitamin-A causes night-blindness whereas rickets is caused due to the deficiency of vitamin-D.

26. The germplasm is required for the propagation of plants and animals. Germplasm is the [Morning Shift-2016 (I)]

1. genetic resources
2. seeds or tissues for breeding
3. egg and sperm repository
4. a germ cell’s determining zone
Select the correct answer using the codes given below:

Correct Answer: (c) 2 and 3
Solution:

The germplasm includes the collection of genetic resources for further breeding or research programmes in plants and animals. It is a collection of seeds and tissues in case of plants, egg and sperms in case of animals.

27. Dengue virus is known to cause low platelet count in blood of patient by [Morning Shift-2016 (I)]

1. interfering in the process of platelet production in bone marrow.
2. infecting endothelial cells.
3. binding with platelets.
4. accumulating platelets in intestine.
Select the correct answer using the codes given below:

Correct Answer: (d) 1, 2 and 3
Solution:

The platelet count in dengue fever decreases because virus infects vascular endothelial cells, suppresses the platelet production in bone marrow and also gets attached to the platelet cells individually.

28. Plants contain a variety of sterols like stigmasterol, ergosterol, sitosterol, etc., which very closely resemble cholesterol. These plant sterols are referred as [Morning Shift-2016 (I)]

Correct Answer: (a) phytosterols
Solution:

All sterols derived from plants are referred as phytosterols. Vitamin-D is also known as calciferol or ergocalciferol. It is important for absorption of calcium from stomach. Ergocalciferol is used to treat hypoparathyroidism. Lumisterol is a stereoisomer of ergosterol. It is produced when sterol is exposed to ultraviolet radiations

29. In Artificial Insemination (AI) process, which of the following is/are introduced into the uterus of the female? [Morning Shift-2016 (I)]

Correct Answer: (c) Only sperms
Solution:

In artificial insemination, only the sperms are introduced in the female genital track to induce fertilisation process.

30. Genetically Modified (GM) crops contain modified genetic material due to [Morning Shift-2016 (I)]

1. introduction of new DNA
2. removal of existing DNA
3. introduction of RNA
4. introduction of new traits
Select the correct answer using the codes given below:

Correct Answer: (d) 1, 2 and 4
Solution:

Genetically modified crops contain segments of foreign DNA that bring a new trait in the existing genome of the organism. It might involve the removal of some part of existing DNA too. It does not involve introduction of RNA.