Sperm Anatomy

Q.

What happens during fertilization in humans after many sperms reach close to the ovum?

1. All sperms except the one nearest to the ovum lose their tails.

2. Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.

3. Only two sperms nearest the ovum penetrate zona pellucida

4. Cells of corona radiata trap all the sperms except one

Q.

Which part of sperm enters an egg in humans?

Q. Acrosome reaction in sperm is triggered by

1. Release of lysine
2. Capacitation
3. Influx of $N{a}^{+}$
4. Release of fertilizin

Q. A cross section at the midpoint of the middle piece of human sperm will show

1. centriole, mitochondria and 9 + 2 arrangement of microtubules
2. centriole and mitochondria
3. mitochondria and 9 + 2 arrangement of microtubules
4. 9 + 2 arrangement of microtubules only

Q.

What gives sperm motility?

Q.

What happens to other sperms entering the ovum cytoplasm?

Q.

How do spermatids become sperms?

Q. Diffrence between egg & sperm

Q.

In the given figure, identify the labelled parts and match them with their relative description.

1. P - ii Q - iii R - v S - i

2. P - v Q - i R - iii S - ii

3. P - iv Q - iii R - ii S - i

4. P - ii Q - v R - iv S - i

Q. State how the sperm is structurally adapted to reach and penetrate the ovum. [4 MARKS]

Q. Draw a diagram of mature human sperm. Label any three parts and write their functions.

Q.

The power house of sperm is contained in___

1. Middle part of sperm

2. Head part of sperm

3. Tail part of sperm

4. Acrosome

Q. Which one of the following statements about human sperm is correct?

1. Acrosome has a conical point structure used for piercing and penetrating the egg resulting in fertilisation
2. The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
3. Acrosome serves no particular function
4. Acrosome serves as a sensory structure leading the sperm towards the ovum

Q. Middle piece of mammalian sperm possesses

1. Mitochondria and centriole
2. Mitochondria only
3. Centriole only
4. Nucleus and mitochondria

Q. Is Oxytocin released in males? if yes then why?

Q.

Can two sperms enter an egg?

Q. Which organelle is absent in human sperm?

1. Nucleus
2. Centriole
3. E.R.
4. Mitochondria

Q.

Given below are certain statements regarding sperm organelles. With respect to these statements, choose the correct option.

Statement 1: Centrioles provide polarity to the sperm.

Statement 2: Centrioles release energy when mitochondria in sperm become dysfunctional.

Statement 3: Centrioles help in cell division in the zygote formed post fertilisation.

Statement 4: Sperm do not possess centrioles.

1. Statement 1, 3 and 4 are correct.

2. Statement 1 is correct.

3. Statement 1 and 2 are correct.

4. Statement 3 is correct.

Q.

The cell organelle(s) present in a mature sperm is/are

1. Acrosome

2. Mitochondria

3. Centriole

4. Nucleus

5. All of the above

Q.

Acrosome of the sperm is derived from_______

1. Golgi apparatus

2. nucleus

3. centriole

4. mitochondria

Q. Give equivalent term for the condition in which the cell contents are shrunken .

Q. How many autosomes are present in a sperm?

Q.

The spermatozoan has

1. Head

2. Tail

3. All of the above

4. Mid-piece

Q.

Choose the correct option with respect to the assertion and reason given.

Assertion [A]: Sperms are stripped of other organelles except for mitochondria.

Reason [R]: Sperm motility is important for fertility in humans.

1. [A] is true and [R] is false.

2. [A] is false and [R] is true.

3. Both [A] and [R] are true and [R] is a correct explanation to [A].

4. Both [A] and [R] are true but [R] is not a correct explanation to [A].

Q. Which one of the following statements about human sperm is correct?

1. Acrosome has a conical point structure used for piercing and penetrating the egg resulting in fertilisation
2. The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
3. Acrosome serves as a sensory structure leading the sperm towards the ovum
4. Acrosome serves no particular function

Q.

In which part of the human sperm, acrosome is found?