Find the Second Year Biology Chapter 18 Short Questions Online Preparation (Reproduction)

Question # 1

What are test tube babies?

Ans 1: Parental sperms and ovum is fertilized in vitro,(outside the female body) and then zygote is implanted back into mother uterus, placenta established and remaining development takes place in the body of the mother leading to normal birth.

Question # 2

How seedless fruit are formed?

Ans 1: Seedless fruit are also called parthenocapic fruits they formed without fertilization. It may be formed naturally as in banana and may formed artificially like seedless grapes.

Question # 3

Define seed dormancy. Write its signifance. Give Its importance.

Ans 1: it is special condition of rest, which enables an embryo to survive the unfavorable environmental conditions.
Ans 2: Its importance is that during this period of rest the embryo ceases its growth.
Ans 3: This is of great survival importance to the plant in that it prevents the dormant seeds from germinating in response to condition such as long spell of warmth in winter.

Question # 4

What is menopause? Which factors affect reproductive cycle in female?

Ans 1: The end or complete stop of the menstrual cycle is called menopause,after which the female stops producing the ova. Malnourishment and emotional stresses effect the female reproductive cycle which may be disturbed. The cycle is not completed in its normal 28 days.

Question # 5

How oestrous cycle different from menstrual cycle?

Ans 1: oestrous cycle: Oestrous cycle is a reproductive cycle found in all female mammals except human female. In this cycle, the estrogen production prepares the uterus for conception partly and also follicle develops ova. At this stage female needs a physical stimulus of mating for ovulation. She exhibits a desire for mating or is said to be on heat.
Ans 2: Menstrual Cycle: Menstrual cycle in human females the periodic reproductive cycle is completed in approximately 28 days and involves changes in the structure and function of the whole reproductive system. It is called menstrual cycle.

Question # 6

What are phytochromes?

Ans 1: Phytochromes are blue light sensitive proteins found in plants. They exist in two form i.e,P_{660 and}P_{730. They play an important role in photoperiodism.}

Question # 7

Define gonorrhea and AIDS.

Ans 1: Gonorrhea is caused by gram positive bacteria called Neisseria gonorrhoeae,mainly affecting the mucous membrane of urinogenital tract. New born infants may acquire serious eye infection if they pass through infected birth canal. It is highly contagious through sexual contact.
Ans 2: AIDS:It is caused by AIDS virus (acquired immune deficiency virus) mainly destroy the WBCs (Iymphocytes) so immune system becomes weak. It is also transmitted from infected person through sexual contact.

Question # 8

Define placenta. Give its function.

Ans 1: Placenta acts as bridge between mother body and foetus. Once the placenta established it start secreting progesterone hormone which maintain pregnancy. Placenta also play role in transport of nutrients and oxygen to foetus and bring back waste from the foetus to mother body.

Question # 9

How Implantation differes from gestation?

Ans 1: Implantation: Implantation is when the new human created at fertilization implants in the uterus. The newly created offspring,technically referred to as a blastocyst,travels to the uterus through the fallopian tube and implants in the wall of the uterus.
Ans 2: Gestation: Gestation means carrying the embryo inside the females uterus.
It is the time period from conception to birth of the child.

Question # 10

What is tissue culture? Explain.

Ans 1: Growth of plant under aseptic conditions in culture medium is called tissue culture. In this technique tissue cut from the plant could be stimulated by the addition of nutrients, cytokinin, auxin, these cell show continued growth and differentiated in to a new plant.

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Second Year Biology Chapter 18 Short Questions Online Preparation (Reproduction)

Online Short Questions For Chapter 4 "12th Class Biology Chapter 18 Short Questions Preparation "

Biology - 12th Class Biology Chapter 18 Short Questions Preparation

What are test tube babies?

How seedless fruit are formed?

Define seed dormancy. Write its signifance. Give Its importance.

What is menopause? Which factors affect reproductive cycle in female?

How oestrous cycle different from menstrual cycle?

What are phytochromes?

Define gonorrhea and AIDS.

Define placenta. Give its function.

How Implantation differes from gestation?

What is tissue culture? Explain.

Prepare Complete Set Wise Questions For Chapter 4 "12th Class Biology Chapter 18 Short Questions Preparation "

Set 1

Set 2

Set 3

Set 4

Set 5

Set 6

12th Class Biology Chapter 18 Short Questions Preparation - Set 1

What are test tube babies?

How seedless fruit are formed?

Define seed dormancy. Write its signifance. Give Its importance.

What is menopause? Which factors affect reproductive cycle in female?

How oestrous cycle different from menstrual cycle?

What are phytochromes?

Define gonorrhea and AIDS.

Define placenta. Give its function.

How Implantation differes from gestation?

What is tissue culture? Explain.

12th Class Biology Chapter 18 Short Questions Preparation - Set 2

Define phytochromes and give its types.

Describe the process of cloning.

What is seed dormancy?

What is the role of P730 phytochrome in flowering?

Name various parts of male reproductive system in male.

What is Apomixes? Or What is meant by Apomixes?

Differentiate identical twins and triplets.

Why seed plants are predominantly present all around as?

What are advantage of cloning?

What is difference between oogenesis and spermetogensis in humans?

12th Class Biology Chapter 18 Short Questions Preparation - Set 3

Define vernalization.

Differentiate between parthenocarpy and apomixes.

Define Ovulation.

What is difference between oogenesis and spermetogensis in humans?

Define parthenocarpy with example.

Differentiate identical twins and triplets.

What is diplohaplontic life cycle? Give its types.

What is role of progestrone in pregnancy?

Name various parts of male reproductive system in male.

Define reproduction.What is its significance?

12th Class Biology Chapter 18 Short Questions Preparation - Set 4

How Implantation differes from gestation?

Differentiate between lactation and gestation.

Differentiate between parthenocarpy and apomixes.

Define seed dormancy. Write its signifance. Give Its importance.

Define phytochromes and give its types.

What is seed dormancy?

Define terms menstruation and menopause.

Distinguish between vernalization and seed dormancy.

How oestrous cycle different from menstrual cycle?

What is genital herpes?

12th Class Biology Chapter 18 Short Questions Preparation - Set 5

What are advantages of cloning?

Write about the disease syphilis? Or Give causes and symptoms of syphilis?

Describe the process of cloning.

Give the function of interstitial cells of testis.

Give importance of photoperiodism in plants.

Apomixes is a form of parthenogenesis.Discuss

Differentiate between short day plant and long day plants with examples.

What is genital herpes?

What is the role of P₇₃₀phytochrome in flowering?