WorksheetsSDS BioXline 4 CHAP 9&10 S11T7
Total questions: 30
Worksheet time: 11mins
The functional megaspore develope after three successive mitotic division into
Embryo
Ovule
Zygote
Embryo sac
A typical angiosperm embyo sac at maturity is eight nuclei with
One cell
Four cells
Seven cells
Eight cells
Endosperm is formed during the double fertilization by
Ovum and male gamete
Two polar nuclei and one male gamete
One polar nuclei and one male gamete
Two polar nuclei and two male gamete
In flowering plants, pollen is released from the
Anther
Stigma
Pollen tube
Carpel
How many nuclei are present in the embryo sac before fertilization?
2
4
8
16
Which of the following undergoes meiosis in the development of pollen grains?
Microspore
Microgametophytes
Microsporangium
Microsporocytes
In spermatogenesis, the primordial germ cells undergo mitotic division to form
Spermatogonia
Sperm
Diploid spermatogonia
Haploid spermatogonia
The following are stages in spermatogenesis.
P: Spermatogonium.
Q: Primary spermatocyte.
R: Secondary spermatocyte.
S: Spermatid.
Which of the following stages involve haploid cells?
P and Q
P and S
R and S
Q and R
In oogenesis, the first meiotic division takes place during the development of
primordial germ cells to oogonium
oogonium to primary oocytes
primary oocytes to secondary oocytes
secondary oocyte to ovum
Testosterone is secreted by
Hypothalamus
Anterior pituitary gland
Sertoli cell
Leydig cell
The function of Sertoli cell is
Control the release of sperm into the lumen of seminiferous tubules
Removes the degenerating spermatogenic cell by phagocytosis
Nourishes the spermatids
Secrete testosterones hormone
What is the factor that stimulates ovulation?
High level of LH
Low level of LH
Low level of estrogen
High level of progesterone
What causes the degeneration of
corpus luteum and its spontaneous abortion?
Low level of estrogen
High level of estrogen
Low level of progesterone
Lack of LH
During an acrosome reaction, the acrosome will
release enzymes that digest the outer layer of the egg
secrete calcium ions which cause
the sperm to fuse with egg.
secrete chemical substance that attracts the egg to the sperm
release enzymes which cause the sperm to bind with egg
The endometrial wall is thickened during the secretory phase of uterine cycle. Why is this condition important?
To provide an implantation site which rich in nutrients.
To decrease the supply of blood to fetus.
To ensure that sufficient blood is secreted during uterine cycle.
To stimulate the beginning of menstrual flow phase.
Which of the following is NOT a stage of the embryonic development in human?
Cleavage
Gastrulation
Fertilization
Organogenesis
What is the hormone secreted by placenta during parturition?
Estrogen
Prostaglandin
Oxytocin
Prolactin
What are the hormones that is inhibited during pregnancy?
Estrogen and progesterone
Prolactin and oxytocin
Oxytocin and progesterone
Prostaglandin and oxytocin
About which day in a normal human menstrual cycle does rapid secretion of LH normally occurs?
5th day
11th day
14th day
20th day
The endocrine structure and the corresponding hormones are listed in the table above. Match the columns and select the correct option.
(a) - (t), (b) - (r), (c) - (s), (d) - (q)
(a) - (t), (b) - (r), (c) - (q), (d) - (s)
(a) - (t), (b) - (q), (c) - (s), (d) - (r)
(a) - (r), (b) - (t), (c) - (s), (d) - (q)
What is growth?
the qualitative change in form in an organism over a period of time
the quantitative increase in size in an organism over a period of time
the change in the degree of specialization of tissues
a measure of an increase in size of an object
Which of the following measurement methods best represent growth of a plant?
Surface area of plant
Wet mass of plant
Height of plant
Dry mass of plant
Which of the following is the growth strategy of arthropod?
Molting
Accretion
Addition
Modification
Growth for unicellular organisms are usually counted by measuring their
length
volume
surface area
population size
Which of the following growth curve best represents growth in insects, birds and humans?
Unlimited growth curve
sigmoid growth curve
Limited growth curve
Intermittent growth
The word ‘allometric growth’ describes
A net change in shape during growth
A change in gene composition during growth
Different growth rates of parts within the same organism
A change in developmental timing during metamorphosis
When studying bacterial growth curves, the relatively flat period when the population appears not to be grow is called as
log phase
lag phase
stationary phase
exponential phase
What does an absolute growth curve show?
It shows the actual growth of the organism
It shows the relative growth of different organs in the organism
It shows the rate of growth of the organism
It shows the lifespan of an organism
In decelerating phase,
Overall growth has ceased
Growth rate is maximal
No cell division and cell enlargement occur
Growth rate begins to decrease
What is the usual shape of an absolute growth curve?
Bell shaped
J-shaped
S-shaped
Step-like shaped
