Fertilisation

Q.

What is the function of placenta?

Q.

Although 2 cells called gametes fuse, the product formed is a single cell called the zygote. Justify.

Q. was the first successfully cloned mammal.

1. Dolly, the sheep
2. Dolly, the dog
3. Dolly, the hen
4. Dolly, the pig

Q.

A zygote is formed as a result of fertilization.

1. True
2. False

Q. One of the male gametes fuses with an egg cell to form the while another fuses with two polar nuclei to form the.

1. zygote
2. endoplasm
3. ovule
4. endosperm

Q. Pollen tube grows from the and reaches the in the ovary where fertilisation takes place.

1. anther
2. filament
3. ovule
4. stigma

Q.

Define fertilisation.

Q.

What changes are observed in the uterus subsequent to implantation of the young embryo?

Q.

Question 38
Why is it that fertilization cannot take place in flowers if pollination does not occur?

Q.

What is an early embryo called?

Q. After fertilisation, what is the time period required for the formation of blastocyst?

1. 7 days
2. 8 days
3. 9 days
4. 10 days

Q.

What is gestation period? What is human gestation period? Define parturition. [3 MARKS]

Q. Which of the following is not true regarding placenta?

1. Removal of waste from embryo
2. Supply nutrients to the developing embryo
3. Site of Implantation
4. Develops between uterine wall & embryo

Q.

Complete the following:

Placenta is _____ permeable.

Q.

Fusion of egg and the sperm is termed as triple fusion.

1. False

2. True

Q. The first mammal clone dolly was created by

1. T.H. Morgan
2. Ian Wilmut
3. Robert Briggs
4. Thomas King

Q. Pollen tube grows from the and reaches the in the ovary where fertilisation takes place.

1. anther
2. filament
3. ovule
4. stigma

Q. What is the average gestation period in humans?

1. 40 weeks
2. 50 weeks
3. 30 weeks
4. 25 weeks

Q.

The male reproductive part of a flower is known as _______.

1. petals

2. sepals

3. stamen

4. pistil

Q. What is the average gestation period in humans?

1. 40 weeks
2. 50 weeks
3. 30 weeks
4. 25 weeks

Q. All of the following methods can be used along with in-vitro fertilization to assist those females who cannot conceive, except

किसके अतिरिक्त निम्नलिखित सभी विधियों और इन-विट्रो निषेचन का उपयोग उन महिलाओं की सहायता के लिए किया जा सकता है जिनमें गर्भधारण की समस्या रहती है?

1. ZIFT
2. IUT
3. ET
4. IUI

Q. Why cannot fertilisation take place in flowers if pollination does not occur?

Q.

Which of these scenarios would result in the formation of identical twins?

1. Two eggs are released at a time, and each of them gets fertilised by a different sperm

2. One egg is released and two sperms fertilise it.

3. One egg is released, one sperm fertilises with it, and the resulting cells formed divide into two balls of cells, each of which develop separately.

4. Two eggs are released at a time, and each of them get fertilised by the same sperm

Q. Zygotes formed by internal fertilisation have better chance of survival than the ones formed by external fertilisation.

1. True

2. False

Q. Union of male and female gametes inside female body is called internal fertilisation.

1. False
2. True

Q. After fertilization, the outer integument forms

1. Testa
2. Tegmen
3. Perisperm
4. Pericarp

Q. In females, fertilisation takes place in the and implantation happens inside the .

1. cervix
2. fallopian tube
3. ovaries
4. uterus

Q. In which type of organisms is fragmentation and/or regeneration a mode of reproduction?

1. Complex multicellular plants and animals.
2. Complex unicellular organisms.
3. Simple multicellular plants and animals.
4. Simple unicellular organisms.

Q.

Why embryo in humans is called a fetus?

Q. The phenomenon of syngamy (fertilization) in angiosperms was discovered

1. Svedberg
2. Strasburger
3. Coulter and Chamberlin
4. Nawaschin