NTSE Most Probable Questions-Biology|Latest Exam Pattern 2018-19

We know you’ve been working hard, it’s time for some quick exercises with some last moment study material. Here are a few most probable questions for NTSE-Biology, compiled by Team NTSE Guru.

In a cell which cell organelle other than nucleus contains DNA?

(a) Lysosome 

(b) Golgi bodies

(c) Endoplasmic reticulum

(d) Mitochondria

Solution: Eukaryotic cells are more complex than prokaryotic cells. The nucleus contains most of the genetic material (DNA) of the cell. Additional DNA is in the mitochondria and chloroplasts. They have their own genetic system.

Diabetus insipidus is caused by less production of:

(a) ACTH                 

(b) TSH                 

(c) ADH                   

(d) GH

Solution: Diabetes insipidus is caused by problems with a chemical called vasopressin (AVP), which is also known as antidiuretic hormone (ADH). It’s a hormone made by the hypothalamus in the brain and stored in the posterior pituitary gland. ADH constantly regulates and balances the amount of water in your blood.

In human males, all the chromosomes are paired perfectly except one. This/these unpaired chromosome/s is/are:

(a) Large chromosome                                      

(b) Small chromosome

(c) Y-chromosome                                              

(d) X-chromosome

Solution:  Males have one X and one Y chromosome. So both are unpaired, as both are present in as single.

Break down of pyruvate to give carbon dioxide, water and energy take place in:

(a) Cytoplasm                                                           

(b) Mitochondria

(c) Chloroplast                                                          

(d) Nucleus

Solution:  The conversion of pyruvate to acetyl CoA, the citric acid cycle takes place in the matrix of the mitochondria.

What will happen if diameter of artery is reduced?

(a) Blood pressure will fall                    

(b) Blood pressure will increase

(c) Blood pressure will remain same                

(d) Blood will coagulate.

Solution: decreased diameter means more of the blood contacts the vessel wall, and resistance increases, subsequently decreasing flow. The influence of lumen diameter on resistance is dramatic: A slight increase or decrease in diameter causes a huge decrease or increase in resistance.

The correct pathway of blood in circulatory system is-

(a) Auricles ® ventricles ® Arteries ® Veins

(b) Ventricles ® Auricles ® Veins ® Arteries

(c) Ventricles ® Veins ® Arteries ® Auricles

(d) Veins ® Ventricles ® Arteries ® Auricles

Solution:

An embryo sac of flowering plant contain:

(a) Eight cells, Seven nuclei                               

(b) Seven cells, Seven nuclei

(c) Seven cells, Eight nuclei                                 

(d) Eight cells, Eight nuclei

Solution: This is seven celled and 8 nucleated stage.

Regulation of Spermatogenesis is done by:

(a) Oestrogen                                                  

(b) L.H

(c) Androgen                                                   

(d) None of these

Solution: Both FSH (directly) and LH (indirectly via testosterone-androgen receptor [AR]) exert their actions on spermatogenesis, mainly through the regulation of Sertoli cell factors. In response to the gonadotropins.
Living mechanical tissue is:

Living mechanical tissue is:

(a) Parenchyma                                                      

(b) collenchymas                   

(c) Sclerenchyma                                                         

(d) Chlorenchyma

Solution: Collenchyma tissue is composed of elongated cells with irregularly thickened walls. They provide structural support, particularly in growing shoots and leaves. …Collenchyma cells are usually living, and have only a thick primary cell wall made up of cellulose and pectin.

Growth of pollen tubes towards ovule for ‘fertilization is due to:

(a) Thigmotropism             

(b) Phototropism

(c) Chemotropism              

(d) Hydrotropism

Solution: The growth of a plant part due to chemical stimulus is known as chemotropism. An example of chemo-tropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovulesFertilization of flowers by pollen is achieved because the ovary releases chemicals

Practice as much questions as you can. For more such type of questions, you can visit www.ntseguru.in.

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