Case Study Questions Class 10 Science Chapter 8 How Do Organisms Reproduce

Case study Questions Class 10 Science Chapter 8 are very important to solve for your exam. Class 10 Science Chapter 8 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 10 Science Chapter 8 How Do Organisms Reproduce

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

How Do Organisms Reproduce Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 8 How Do Organisms Reproduce

Case Study/Passage-Based Questions

Question 1:

The male reproductive system consists of portions that produce the germ cells and other portions that deliver the germ cells to the site of fertilization. Testes are located outside the abdominal cavity in the scrotum because sperm formation requires a lower temperature than normal
body temperature. It also has a role of secretion of male sex hormone which brings changes in appearance seen in boys at the time of puberty. Vas deferens unites with a tube coming from the urinary bladder. The urethra is a common passage for sperms and urine. The prostate gland and seminal vesicles add their secretions so that sperms are now in a fluid.

(i) Name the sex hormone associated with males.
(a) Testosterone
(b) Progesterone
(c) Oestrogen
(d) None of these

Answer: (a) Testosterone


(ii) Which of the following statements is incorrect ?
(a) Sperms are present in a fluid
(b) Fluid provides nutrition to sperms
(c) Fluid makes easier transportation of sperms
(d) Fluid helps to bind the sperms together

Answer: (d) Fluid helps to bind the sperms together/p>


(iii) Testes are located outside the abdominal cavity in scrotum because
(a) sperms formation requires higher temperature than body temperature
(b) sperms formation requires lower temperature than body temperature
(c) it is easier to transport sperms from the scrotum
(d) None of these

Answer: (b) sperms formation requires lower temperature than body temperature


(iv) Which of the following statement is incorrect?
(a) Sperms and urine has a common passage from urethra.

(b) Sperms have long tail that helps them to move forward.
(c) Sperms contain genetic material.
(d) Sperms formation requires 1–3°C higher temperature than normal body temperature.

Answer: (d) Sperms formation requires 1–3°C higher temperature than normal body temperature.


(v) What is the nature of semen?
(a) slightly acidic
(b) Neutral
(c) Slightly basic
(d) Strongly basic

Answer: (c) Slightly basic


Question 2:

Rohit collected some pond water which was dark green in color in a test tube. She took out green-colored mass from it and separated its filaments by using needles. She broke some filaments into small fragments and put them in a Petri dish containing clean water. She observed that after a few days the small fragments gave rise to complete filaments.

2.1) What do you think the mass of green filament was ? 
(a) It was a mass of Spirogyra filament.
(b) It was a colony of Volvox algae.
(c) It was large brown algae.
(d) It was a mass of fungal filaments

Answer:(a) It was a mass of Spirogyra filament. ​


2.2) Organisms that reproduces in similar ways as Spirogyra is :
(a) yeast
(b) hydra
(c) Planaria
(d) Sea anemone

Answer: (d) Sea anemone ​


2.3) The small fragment gave rise to new filament. What does it indicate  ?
(a) Spirogyra reproduces asexually through budding.
(b) Spirogyra reproduces asexually through spore formation.
(c) Spirogyra reproduces asexually through fragmentation.
(d) Spirogyra reproduces asexually through fission

Answer: (c) Spirogyra reproduces asexually through fragmentation. ​


2.4) Which among the following organisms do not reproduce by fragmentation ?
(a) Riccia 
(b) Selaginella
(c) Aurelia
(d) Marchantia

Answer: (c) Aurelia. ​


2.5) Select the correct statement from the following.
(a) Only multicellular organisms can undergo fragmentation.
(b) Both unicellular and multicellular organisms can undergo fragmentation.
(c) Fragmentation is sexual mode of reproduction.
(d) Fragmentation is found only in algae

Answer: (a) Only multicellular organisms can undergo fragmentation ​


Question 3:

In humans, if the egg is not fertilized, it lives for about one day. Since the ovary releases one egg every month, the uterus also prepares itself every month to receive a fertilized egg. Thus its lining becomes thick and spongy. This would be required for nourishing the embryo if fertilization had taken place. Now, however, this lining is not needed any longer. So, the lining slowly breaks and comes out through the vagina as blood and mucous. This cycle takes place roughly every month and is known as menstruation. It usually lasts for about two to eight days.

3.1) What is the sexual cycle in human female that takes place every 28 days and marked by bleeding ?
(a) Sexual cycle
(b) Reproductive cycle
(c) Menstrual cycle
(d) Blood cycle

Answer: (c) Menstrual cycle ​


3.2) If fertilisation takes place, it results in the formation of :
(a) an embryo
(b) a zygote
(c) a foetus
(d) a placenta

Answer: (b) a zygote ​​


3.3) Why does vaginal bleeding occur in human females on attaining puberty ?
(a) Unfertilised egg along with thick uterus lining come out of vagina in form of bleeding.
(b) In human females, ovaries start releasing egg or ovum once every 28 days from the age of puberty.
(c)  If fertilisation does not occur then menstrual flow occurs at the end of cycle.
(d) All of these 

Answer: (d) All of these  ​​​


3.4) In what conditions vaginal bleeding will not occur in a human female who has attained puberty ?
(a) If the ovum is fertilised
(b) If the ovum is not fertilised
(c) If there is some hormonal imbalance in female
(d) Both (a) and (b)

Answer: (d) Both (a) and (b)  ​​​


3.5) Mark one change from the following associated with sexual maturation in boys ?
(a) loss of milk teeth
(b) weight gain
(c) increase in height 
(d) cracking of voice

Answer: (d) cracking of voice ​​​


Question 4:

A newly married couple does not want have children for few years. They consulted a doctor who advised them barrier method and chemical method of birth control. Yet another couple who already have two children and are middle aged also consulted doctor for some permanent solution to avoid unwanted pregnancy. Doctor advised them surgical method of birth control.

Another category of contraceptives acts by changing the hormonal balance of the body so that eggs are not released and fertilisation cannot occur. These drugs commonly need to be taken orally as pills. However, since they change hormonal balances, they can cause side-effects too. Other contraceptive devices such as the loop or the copper-T are placed in the uterus to prevent pregnancy. Again, they can cause side effects due to irritation of the uterus.

4.1) What are the barrier methods of birth control ?
(a) Condoms
(b) Oral pills
(c) Surgery
(d) Both (a) and (c)

Answer: (a) Condoms ​​​


4.2) How physical barrier prevent pregnancy ?
(a) They kill the sperms.
(b) They kill the ovum.
(c) They prevent intercourse.
(d) They prevent fertilisation

Answer: (d) They prevent fertilisation. ​​​


4.3) How chemical methods prevent pregnancy ?
(a) Vaginal pills contain chemical called spermicides which kill the sperms. 
(b) Oral pills prevent ovulation so there will be no fertilisation.
(c) Oral pills stop menstruation in females.
(d) Both (a) and (b) 

Answer: (d) Both (a) and (b) ​​​


4.4) Select the correct statement regarding surgical method of birth control. 
(a) It involves termination of pregnancies in women particularly after eight weeks of conception.
(b) Small portion of sperm duct or vas deferences in males is removed by surgical operation and both cut ends are ligated properly.
(c) Small portion of oviducts in females is removed by surgical operation and cut ends are ligated. 
(d) Both (b) and (c) 

Answer: (d) Both (b) and (c) ​​​


4.5) Select the correct statement regarding birth control methods.
(a) Barrier method of birth control also protects the couple from sexually transmitted diseases.
(b) Some women experience unpleasant side effects on taking oral pills because of change in hormonal balance in body.
(c) Surgical method in males is called vasectomy and in females is called tubectomy.
(d) All of these

Answer: (d) All of these ​​​


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