Explore topic-wise InterviewSolutions in Current Affairs.

Hydrocarbons and compounds derived from hydrocarbons is known as Organic Compounds.

A : The products are sodium hydrogen sulphate (NaHSO₄ ) and HCl gas. 

B : HCl gas as collected by the upward displacement of air.

Argon atom, 18 electrons .

Fungi may be homothallic (bisexual) or heterothallic (unisexual).

Internal fertilization takes place in a hen.

Students are encouraged to rehearse the MCQ Questions for class 8 Science Reproduction in Animals with Answers is out there here. MCQ Questions for class 8 Science with Answers are ready according to the latest Exam Pattern. Students can solve Class 8 MCQ Questions and survey their preparation level. 

MCQ Questions are frequently of most extreme assistance as you'll recollect every one of the ideas. These MCQ Questions with answers clear for a quick amendment of the Chapter in this manner assisting you with supporting subject information. students can get to effectively these Multiple choice Questions to concentrate well for the exam.

• Modes of Reproduction
• Sexual Reproduction
• Asexual Reproduction

Have a look at the MCQ Questions for class 8 and cross-check your answers during preparation.

Practice Class 8 Science MCQ Questions chapter-wise

1. The number of modes by which animals reproduce are

(a) two
(b) three
(c) four
(d) none of these

2. Binary fission is observed in

(a) Hydra
(b) yeast
(c) Amoeba
(d) human being

3. Asexual reproduction is observed in

(a) cow
(b) buffalo
(c) sponge
(d) hen

4. In Hydra, the mode of reproduction is

(a) asexual
(b) sexual
(c) both (a) and (b)
(d) none of these

5. The animals that produce new young ones are called

(a) viviparous
(b) oviparous
(c) both
(d) none of these

6. The male gamete or sperm consists of

(a) three parts
(b) two parts
(c) four parts
(d) none of these 

7. Ovum or eggs are formed in

(a) ovary
(b) testes
(c) oogenesis
(d) ovident

8. In humans, the early development of fertilized eggs take place in

(a) Ovary
(b) Testis
(c) Oviduct
(d) Uterus

9. The cell formed after fertilisation is called

(a) embryo
(b) foetus
(c) zygote
(d) egg

10. Sets of reproductive terms are given below. Choose the set that has an incorrect combination.

(a) Sperm, testis, sperm duct, penis
(b) Menstruation, egg, oviduct, uterus
(c) Sperm, oviduct, egg, uterus
(d) Ovulation, egg, oviduct, uterus

11. Which is not a viviparous animal?

(a) Human being
(b) Cow
(c) Dog
(d) Butterfly

12. Budding occurs in

(a) Amoeba
(b) dog
(c) Paramecium
(d) yeast

13. The number of eggs produced in internal fertilisation is

(a)  more than external fertilization
(b)  less than external fertilization
(c) more or less than external fertilisation depending on the environmental conditions
(d) equal to external fertilisation

14. How many parents are involved in sexual reproduction?

(a) 0
(b) 4
(c) 2
(d) 1

15. Which of the following is the site of fertilisation in humans?

(a)  Uterus
(b) Fallopian tube
(c) Ovary
(d) Vagina

16. Which of the following is not an oviparous animal?

(a) Cow
(b) Silkworm
(c) Hen
(d) Frog 

17. Name the process in which tadpoles develop into young frogs.

(a) Budding
(b) Fertilisation
(c) Metamorphosis
(d)  Embedding

18. The male gamete is called the

(a) Zygote
(b) Sperm
(c) Eggs
(d) ovaries

19. Female reproductive system in human beings contains 

(a) two pairs of ovaries
(b) single ovary
(c) a triplet of ovaries
(d) a pair of ovaries

20. What is the advantage of sexual reproduction over asexual reproduction?

(a) There is no advantage – asexual reproduction is more advantageous
(b) There are more variations
(c) Less number of offspring are produced
(d) Competition for food is less

21. Which of the following is an example of a viviparous animal?

(a) Cat
(b) Cobra
(c) Fish
(d)  Hen

22. The developing zygote is called:

(a) baby
(b) foetus
(c) embryo
(d) none of these

23. What is correct about test tube baby?

(a) Fertilization inside female genital tract and growth in test tube
(b) Rearing of prematurely born baby in incubator
(c) Fertilization outside and gestation inside womb of mother
(d) Both fertilization and development are effected outside the female genital tract

24. Dolly the famous animal was a

(a) donkey
(b) girl
(c) Cloned sheep
(d) Normal sheep

25. Internal fertilization occurs:

(a) in female body
(b) outside female body
(c) in male body
(d) outside male body

Answer:

1. Answer: (a) two

Explanation: There are two modes of reproduction in animals and plants; they're referred to as sexually and asexually reproduction. Every living organism reproduces through two different modes of reproduction, i.e., sexual reproduction or asexual reproduction.

2. Answer: (c) Amoeba

Explanation: Binary fission is a type of asexual reproduction typically observed in prokaryotes and a few single-celled eukaryotes. In this method of asexual reproduction, there is a separation of the parent cell into two new daughter cells.

3. Answer: (c) sponge

Explanation: Sponges are also capable of asexual reproduction. This is accomplished by one of two mechanisms. external budding or internal budding. External budding is when a portion of the sponge breaks off and then regenerates into a complete organism.

4. Answer: (c) both (a) and (b)

Explanation: Hydra is a fresh water living organism which usually divides with the asexual mode of replication that is, budding. During unfavorable conditions, Hydra chooses a different mode of reproduction, i.e. Sexual mode of reproduction.

5. Answer: (a) viviparous

Explanation: Animals that give birth to their young ones are called viviparous. The young ones resemble their parents. Oviparous animals lay eggs while ovo-viviparous organisms produce eggs that develop and hatch inside the mother's body till they are fully developed and born alive.

6. Answer: (a) three parts

Explanation: The sperm basically consists of three parts: Head, Tail and Middle piece. 

7. Answer: (c) oogenesis

Explanation: The process through which ova are formed is known as "oogenesis".

8. Answer: (c) Oviduct

Explanation: In a human early development of fertilized egg takes place in the fallopian tube (oviduct). Zygote enters the uterus 3rd day after fertilization (morula stage).

9. Answer: (c) zygote 

Explanation: Fertilization is the fusion of the male and female sex gametes so as to produce an embryo/zygote. This 2-celled embryo is called the zygote.

10. Answer: (c) Sperm, oviduct, egg, uterus

Explanation: Sperms are generally released by the testis. Sperm duct opens up into the penis to ejaculate the sperm.The unfertilized egg is shed off during menstruation. The uterine tubes are also known as oviduct. In human beings, sperm is released into the oviduct which fertilises with the egg to form a zygote. Eggs develop in the ovary and are ovulated by them.Ovulation leads to the release of the egg. The uterine tubes are also known as oviduct. 

11. Answer: (d) Butterfly

Explanation: Butterfly is not a viviparous animal. Animals such as hen, frog, lizard and butterfly which lay eggs are called oviparous animals.

12. Answer: (d) yeast

Explanation: Budding occurs in yeast.

13. Answer: (b)  less than external fertilization

Explanation: In the case of external fertilisation, the number of eggs produced is more than the number of eggs produced in internal fertilisation. External fertilisation usually occurs in aquatic animals. These animals lay hundreds of eggs and release millions of sperms. However, many of the eggs do not get fertilised (fuse with sperm) to develop into new individuals. This is because the eggs and sperm get exposed to water currents and wind. Also, there are other animals (predators) which may feed on these eggs. Thus, production of a large number of eggs and sperm is necessary to ensure fertilisation of at least a few of them.

14. Answer: (c) 2

Explanation: In sexual reproduction such as humans, two parents are required. In the case of plants, male and female reproductive parts are required.

15. Answer: (b) Fallopian tube

Explanation: Fertilisation is the fusion of male and female gametes. In human beings, it takes place in the fallopian tube of the female reproductive system.

16. Answer: (a) Cow

Explanation: Animals like cows, cats and dogs give birth to young individuals, hence they are called viviparous animals whereas frogs, hens and silkworms lay eggs, and hence they are called oviparous. 

17.Answer: (c) Metamorphosis

Explanation: The transformation of the larva into an adult through drastic changes is called metamorphosis. Frogs, butterflies, silkworm, etc., undergo metamorphosis.

18. Answer: (b) Sperm

Explanation: Male gametes in humans are called sperms. Sperms are produced by testes. Sperms fuse with egg produced by ovaries to form a zygote.

19. Answer: (d) a pair of ovaries

Explanation: The testes is a part of the male reproductive system that produce male gametes called sperms. Sperms fuse with the female gamete, ovum to form the zygote. Zygote develops into the embryo which later develops into the foetus.

20. Answer: (b) There are more variations

Explanation: Since the characteristics of two individuals are combined in sexual reproduction, more variations are seen in the offspring. More variations in offspring ensure better survival in changing environmental conditions.

21. Answer: (a) Cat

Explanation: Viviparous animals give birth to their young ones. Cat is an example of an animal that gives birth to it’s young ones. On the other hand, hen, fish and cobra lay eggs and are termed as oviparous animals.

22. Answer: (c) embryo

Explanation: The developing zygote is called embryo.

23. Answer: (c) Fertilization outside and gestation inside womb of mother

Explanation: In vitro fertilization (IVF) is a process by which an egg is fertilized by sperm outside the body: in-vitro. The process involves monitoring and stimulating a woman's ovulatory process, removing ovum or ova (egg or eggs) from the woman's ovaries and letting sperm fertilize them in a liquid in a laboratory. The fertilized egg (zygote) is cultured in a growth medium and is then implanted in the same or another woman's uterus, with the intention of establishing a successful pregnancy.

24. Answer: (c) Cloned sheep

Explanation: Dolly (5 July 1996 – 14 February 2003) was a female Finnish Dorset sheep and the first mammal cloned from an adult somatic cell.

25. Answer: (a) in a female body

Explanation: Internal fertilization occurs most often in land-based animals, although some aquatic animals also use this method. ... In oviparity, fertilized eggs are laid outside the female's body and develop there, receiving nourishment from the yolk that is a part of the egg.

 Click here for Practice MCQ Questions for Reproduction in Animals Class 8

There are two types of reproduction.

1. Asexual reproduction and 

2. Sexual reproduction.

There are two modes of reproduction present in animals:

1. Asexual reproduction
2. Sexual reproduction

(b) it is oviparous. 

Aorta is the only blood vessel which transports the oxygenated blood from the heart to different parts of the body. As the blood is oxygenated and this blood vessel the oxygen concentration is high, carbon dioxide concentration is low and the blood pressure is very high so as to supply the oxygenated blood to different parts of the body.

(c) A proteinaceous aleurone layer is present in maize grain

Placenta and pericarp are both edible portions in Tomato.

• Cell, the basic structural and functional unit of life, was discovered by Robert Hooke in 1665.
• He observed dead cells of a cork under magnifying device.
• The structure appeared to be like that of small rooms, arranged in a honeycomb pattern. Hence, the name cell.
• Further advancements in microscopy have led to description of cell in more details.

An example of edible underground stem is Potato.

Let,

P(n) ∶ 1²+2²+3³+⋯+n² = \(\frac{n(n+1)n(2+1)}{6}\) ...(i)

Step 1: Put n = 1 in ..(i)

P(1) ∶ 1² = \(\frac{1.(1+1)(2.1+1)}{6}\) or 1 = 1,Which is true Thus, P(1) is true.

Step 2: Assume that P(K) is true for some natural number k, i.e., let

P(k) ∶ 1²+2²+3³+⋯+k² = \(\frac{k(k+1)(2k+1)}{6}\) ...(ii)

Step 3: To prove that

P(k+1) ∶ 1²+2²+3³+⋯+k²+(k + 1)²
\(=\frac{(k+1)(k+2)(2k+3)}{6}\)is also true.

Now, LHS of P(k + 1)

= 1²+2²+3³+⋯+k²+(k + 1)²

\(=\frac{k(k+1)(2k+1)}{6}+(k+1)\)

= \(\frac{1}{6}\)(k + 1)(2k + 1) + 6(k + 1)

= \(\frac{1}{6}\)(k + 1)(2k² + 7k + 6)

= \(\frac{1}{6}\)(k + 1)(2k² + 4k + 3k + 6)

= \(\frac{1}{6}\)(k + 1)[(2k(k + 2) + 3(k + 2))]

= \(\frac{1}{6}\)(k + 1)(k + 2)(2k + 3) = RHS OF P(k + 1)

⟹ P(k + 1) is true whenever P(k) is true Hence, by principle of mathematical induction P(n) is true for all n ∈ M.

Correct option: (C) Mangifera indica

The scientific name of any organism should always be written in italics.

The untreated sewage is often discharged directly into rivers leading to their pollution and increase in water-borne diseases. The Ministry of Environment and Forests has initiated Ganga Action Plan and Yamuna Action Plan to save these major rivers of our country from pollution. Under these plans, it is proposed to build a large number of sewage treatment plants so that only treated sewage may be discharged in the rivers.

The Ganga is the largest river in India with an extraordinary religious ‘ importance for Hindus. Situated along its banks are some of the world’s oldest inhabited cities like Varanasi and Patna. It provides water to about 40% of India’s population across 11 states, serving an estimated population of 500 million people or more, which is larger than any other river in the world.

A number of initiatives have been undertaken to clean the river but failed to deliver desired results. After getting elected, India’s Prime minister Narendra Modi affirmed to work for cleaning the river and controlling pollution. Subsequently, Namami Ganga project was announced by the Government in July 2014 budget. An estimated Rs 2,958 crores have been spent till July 2016 in various efforts to clean up the river.

• Yes, we agree that government has taken initiative in increasing the production of different crops. 
• But introduction of HYVs has created some economical imbalances. 
• They need plenty of water which may reduce the water levels and at one stage we would face scarcity of water.

Answer is Yes.

Answer is Abhi

In Abhi’s store

There were some dangerous rocks near the Scottish coast. The Abbot of Aberbrothok had placed a buoy and fixed a bell on it, near those rocks. If the sea was rough sailors could spot the buoy. Even in the darkness the rough seas made the bell ring. So by day or night the Abbot’s bell saved the sailors and their ships from the rocks, and they blessed him.

1. विदेशी वस्तुओं का

2. जला दिए

3. अपनी पुस्तकों के नीचे

शेखर ने दीयों से तेल लेकर विदेशी कपड़े जलाए, क्योंकि तेल का पौपा नौकरों के कब्जे में था।

शेखर ने घर के दीयों से मिट्टी का तेल लेकर उससे आग जलाई।

शेखर के मस्तिष्क में एक नाटक का लेखक होने की पुकार पहुंचती थी।

शेखर गला खोलकर गाने लगा, “गांधीजी का बोलबाला। दुश्मन का मुंह हो काला।”

शेखर अपने हिन्दी-ज्ञान को प्रमाणित करना चाहता था। इसीके साथ उसे गांधीजी के प्रति अपनी श्रद्धा और राष्ट्रभक्ति भी व्यका करनी थी। इन कारणों से उसने राष्ट्रीय नाटक लिखना प्रारंभ किया।

शेखर ने बाहर घूमने-मिलने जाना छोड़ दिया, क्योंकि : पहनने के लिए देशी कपड़े उसके पास पर्याप्त नहीं थे।

शेखर के मन में विदेशी मात्र के प्रति घृणा हो गई थी। अंग्रेजी भी विदेशी भाषा थी। इसलिए उसे अंग्रेजी भाषा से घृणा हो गई।

पिता ने शेखर के कान पकड़े, क्योंकि अंग्रेजी बालक के प्रश्नों के उत्तर न देकर शेखर बिलकुल चुप रहा था।

अंग्रेजी बालक ने शेखर को चुप देखकर अपना नाम बताया और पूछा – क्या तुम स्कूल में पढ़ते हो?

1. आज्ञा

2. तकलीफ

3. लगातार

4. स्वतंत्र

घर के सदस्य बाहर गए, तब शेखर ने घर के सभी कमरों में से विदेशी कपड़े लेकर नीचे एक खुली जगह में इकट्ठे किए। उनके ढेर पर मिट्टी का तेल डाला और आग लगा दी।

सही उत्तर है विमुख

मुंह काला होना – बदनाम होना
वाक्य : बुरे कर्म करोगे तो मुंह काला होगा ही।

शेखर के मन में एक स्वाधीन लोकतंत्र भारत की छबि बसी थी जिसके राष्ट्रपति महात्मा गांधी थे। उसमें कताई, बुनाई जैसी गांधीजी की प्रवृत्तियों और असहयोग आंदोलन का समावेश था। शेखर का यह स्वप्न हो उसके नाटक की हलचल में भी समाविष्ट था।

शेखर ने अंग्रेजी बालक के किसी भी प्रश्न का उत्तर नहीं र दिया। पिता नहीं चाहते थे कि वह बालक शेखर को अंग्रेजी से अनभिज्ञ १ समझे। इसलिए उन्होंने कुद्ध स्वर में शेखर से कहा, “उत्तर क्यों नहीं दिया? क्या तुम्हारा मुंह टूट गया है?”

शेखर ने अंग्रेजी बालक के किसी भी प्रश्न का उत्तर नहीं दिया। यह बात उसके पिता को बुरी लगी।

1. बचपन

2. घृणा

3. उपस्थिति

4. कठिनाई

5. प्यार

B. एक अमरिकन मिशनरी

शेखर ने बचपन में ‘सत्यवादी हरिश्चन्द्र’ नाटक देखा था।

शेखर के पिता और भाई घर में अंग्रेजी में बात करते थे। पिता शेखर को भी भाइयों के साथ अंग्रेजी में बात करने के लिए प्रोत्साहित करते थे। शेखर भी शैशव से अंग्रेजी बोलता था। शेखर की पहली आया ईसाई थी और अंग्रेजी बोलती थी। उसका पहला गुरु भी एक अमरिकन मिशनरी था, जो दिनभर अंग्रेजी बोलता था। शेखर को ऐसा लगता था जैसे अंग्रेजी ही उसके परिवार की मातृभाषा हो। परिवार में अंग्रेजी का ऐसा चलन देखकर हम कह सकते हैं कि शेखर के घर में अंग्रेजी भाषा का गहरा प्रभाव था।

असहयोग आंदोलन की लहर में बहकर शेखर ने विदेशी कपड़े उतारकर रख दिए। जो कुछ मोटे देशी कपड़े थे, उन्हें ही पहनने लगा। उसने घूमना-मिलना भी बंद कर दिया, क्योंकि उसके लायक देशी कपड़े उसके पास नहीं थे।

सही विकल्प है A. गांधी

शेखर ने आग में घर के सभी विदेशी कपड़े जला दिए।

महात्मा गांधी ने देश में असहयोग आंदोलन शुरू किया था। चारों तरफ स्वदेशी की हवा बहने लगी थी। शेखर के मन पर इसका गहरा प्रभाव पड़ा था। वह गांधीजी के प्रति अपार श्रद्धा रखता था। गांधीजी स्वदेशी वस्तुओं के उपयोग का आग्रह करते थे। विदेशी वस्तुएं देश की पराधीनता की प्रतीक बन गई थी। इसलिए शेखर के मन में भी विदेशी मात्र के प्रति घृणा हो गई थी।

शेखर एक कोमल मन का किशोर है। गांधीजी के असहयोग आंदोलन का उस पर गहरा प्रभाव पड़ा है। स्वदेशी की हवा से प्रेरित होकर उसे विदेशी मात्र से घृणा हो जाती है। वह अपने घर के विदेशी वस्त्रों को खुशी-खुशी जला देता है। वह अंग्रेजी माध्यम का विद्यार्थी है, पर अंग्रेजी को विदेशी भाषा मानकर उससे नफरत करता है और हिन्दी पड़ने में रुचि लेता है। वह अंग्रेजी बालक के अंग्रेजी में पूछे गए प्रश्नों का उत्तर नहीं देता। पिता द्वारा बुद्ध कहलाना स्वीकार करता है, पर अंग्रेजी बोलना उसे स्वीकार नहीं। इस प्रकार शेखर गांधी युग का एक प्रिय बाल पात्र है।