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

Question # 1

Enlist methods of asexual reproduction.

Ans 1: Types of asexual reproduction are:-
Ans 2: a) Budding b) Parthenogenesis c) Cloning d) Tissue culture e) Apomixes f) Sporulation g) Vegetative propagation h) Artificial propagation

Question # 2

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 # 3

What is Gonorrhoa and who caused it?

Ans 1: It is caused by a gram positive bacterium Neisseria gonorrhoeae,mainly affecting the mucous membrane of urinogenital tract. New born infants may acquire serious eye infections if they pass through the infected birth canal.It is highly contagious through sexual contacts.

Question # 4

What is difference between oogenesis and spermetogensis in humans?

Ans 1: Oogenesis: In oogenesis, primary oocytes divide meiotically in to secondary oocytes and first polar body. Second meiotic division in the oocytes proceeds as far as metaphase but is not complete until the oocyte is fertilized by the sperm.
Ans 2: Spermatogenesis: during spermatogenesis primary spermatocytes under go meiotic division to form four secondary spermatocytes and spermatids which then differentiated into four mature sperms.

Question # 5

Differentiate the internal and external fertilization.

Ans 1: External Fertilization:Fertilization which occurs outside the body is know as external fertilization.
It occurs aquatic environment where male gametes can swin towards females gametes in water medium.
Ans 2: Internal Fertilization: Fertilization which occurs inside the body of organisms is known as internal fertilization.
Sperms are lodged in the female body where fertilization occurs.

Question # 6

Differentiate identical twins and triplets.

Ans 1: Identical twins: If new born organisms are the product of mitosis and they have same genetic makeup, they are called identical twins.
Ans 2: Identical Triplets: In some cases, more than one egg are produced by the female and all eggs are independently fertilized two or more zygote. These zygote develops into new offspring, but with different genetic combination. such twins or triplets are called fraternal twins or triplets. They are produced sexually.

Question # 7

Differentiate between lactation and gestation.

Ans 1: Lactation: Lactation means discharge or production of milk from the mammary gland after child birth.
Ans 2: Gestation: Gestation is the total time period of pregnancy is called gestation. In human gestation period is of nine months.

Question # 8

What is the role of P₇₃₀phytochrome in flowering?

Ans 1: P₇₃₀induce flowering in long day plant while inhibit flowering in short day plants.

Question # 9

Give the role of oxytocin.

Ans 1: Oxytocin of ovum from the ovary is called ovulation

Question # 10

Define haploid parthenogenesis.

Ans 1: In the honey bees male develops without fertilization of egg. The queen bee carrying male gametes from the male has the ability to lay eggs that have not been fertilized.If these eggs are not fertilized then they develops in to haploid offspring. It is called haploid parthenogenesis.

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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

Enlist methods of asexual reproduction.

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

What is Gonorrhoa and who caused it?

What is difference between oogenesis and spermetogensis in humans?

Differentiate the internal and external fertilization.

Differentiate identical twins and triplets.

Differentiate between lactation and gestation.

What is the role of P730 phytochrome in flowering?

Give the role of oxytocin.

Define haploid parthenogenesis.

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

Enlist methods of asexual reproduction.

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

What is Gonorrhoa and who caused it?

What is difference between oogenesis and spermetogensis in humans?

Differentiate the internal and external fertilization.

Differentiate identical twins and triplets.

Differentiate between lactation and gestation.

What is the role of P730 phytochrome in flowering?

Give the role of oxytocin.

Define haploid parthenogenesis.

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

What is after birth? Or What is meant by after birth?

What is role of progestrone in pregnancy?

What is vernalization?

Name various parts of male reproductive system in male.

What is genital herpes?

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

Give two disadvantages of cloning.

Define terms menstruation and menopause.

Differentiate between oviparous and viviparous.

Define reproduction.What is its significance?

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

Differentiate the internal and external fertilization.

State two methods of asexual reproduction in animals.

What is seed dormancy?

What is role of progestrone in pregnancy?

Define parthenocarpy with example.

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

Name the hormones that stimulate mammary glands for lactation.

Why seed plants are predominantly present all around as?

Give two disadvantages of cloning.

Name two sexually transmitted disease and their control.

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

What is corpus luteum? Give its function.

What are test tube babies?

What is diploid parthenogenesis?

Why seed plants are predominantly present all around as?

Differentiate between isomorphic and heteromorphic generation.

Define phytochromes and give its types.

Define vernalisation. Give its one importance.

Define fruit.

Give two examples of short day plants.

What is after birth? Or What is meant by after birth?

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

Write about the Gonorrhoea disease.

What is diploid parthenogenesis?

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

Define parthenocarpy with example.

Define vernalization.

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

Define parthenocarpy. How it is artificially induced?

What is difference between oogenesis and spermetogensis in humans?

What is the role of P₇₃₀phytochrome in flowering?

What is the role of P₇₃₀phytochrome in flowering?

What is the role of P₇₃₀phytochrome in flowering?