SCIENCE QUIZ(18/4/23)

New plants may be grown from a group of cells that are taken from other

plants. The given diagram shows the parts of a plant ‘X’. Explants obtained from which of the labelled structure will grow into new plants that are genetically identical to plant ‘X’.

• P

• Q

• R

• S

Tags

NGSS.MS-LS1-2

A student decides to study the impact of removing certain floral parts on fruit formation in

plant species X. He chooses three separate plants that are growing in the same plot A under

uniform conditions. In an adjacent plot B were plants from which no part of the flower was

removed. The data is given as below:

Plant No. Part removed/Plot A Impact on fruit formation

1. Anther 30% less fruit formation

2. Stigma No fruit formation

3. Petal No significant impact on fruit formation

Which of the following can be inferred from the given data?

• a) Anther and stigma are crucial for sexual reproduction in each flower of species X.

• b) Pollen grains are probably unable to germinate if they land on other parts of carpel beside

  the stigma.

• c) Species X is likely to be completely self pollinated.

• d) Species X relies on both self and cross pollination.

Tags

NGSS.MS-LS1-4

Unicellular algae A and B of the same species were taken in separate glass plates and

chloroplasts were removed from the cells of A. After some time, they both were kept in bright sunlight for few hours and then Iodine test was performed on them .What will be the result?

• Both A and B will turn blue black.

• A will turn blue black.

• B will turn blue black.

• Both A and B will remain as they originally were.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-6

The image shows the distribution of type of sex

chromosome in males and females. Based on the

image, when will a male child be born?

• When an egg with X chromosome will fuse with

  a sperm with X chromosome.

• When an egg with X chromosome will fuse with a sperm with Y chromosome.

• When an egg with Y chromosome will fuse with a sperm with X chromosome.

• When an egg with Y chromosome will fuse with a sperm with Y chromosome.

Tags

NGSS.HS-LS3-1

A Planaria worm is cut transversely into two halves P and Q such that the part P contains the

whole head of the worm. Another Planaria worm is cut vertically in such a way that both the

cut pieces R and S contain half head each. Which of the cut pieces of the two Planaria worms

could regenerate to form the complete worm/worms?

• Only P

• Only R and S

• Only P, R and S

• All P, Q, R and S

Birds can sustain high levels of activity much longer than mammals even at high altitudes. Which of the following features found in birds helps in this?

• More efficient expansion and contraction of air sacs as compared to mammals.

• Size of lungs larger than that of a mammal of comparable size.

• Air sacs allowing unidirectional air flow with minimum dead space.

• Circulatory system with more number of erythrocytes per unit volume of blood as

  compared to mammals.

Transpiration has been described as a ‘necessary evil’ because it is inevitable, but potentially

harmful. Which of the following are the after-effects of transpiration?

(i) Absorption of mineral salts.

(ii) Regulation of plant temperature.

(iii) Energy deficit and injury in plants.

(iv) Ascent of sap.

• (i) & (iv)

• (i) & (iii)

• (i), (ii) & (iii)

• (i), (ii) & (iv)

The number and ploidy of nuclei present in a zygote is/are

• one haploid

• one diploid

• two diploid

• four haploid

Tags

NGSS.MS-LS3-2

The correct sequence of organs in the male reproductive system for the transport of sperm is:

• testis → vas deferens → urethra

• testis → ureter → urethra

• testis → urethra → ureter

• testis → vas deferens → ureter

A simplified food chain for an aquatic environment is shown below:

algae → mosquito larvae → small fish → large fish

If the number of mosquito larvae suddenly increased, the food chain would be affected. Analyze

the following consequences and select from the choices what would be the impact?

I. The number of small fish would increase.

II. The number of large fish would decrease.

III. The number of large fish would increase.

IV. Amount of algae would decrease.

• Only I

• Only IV

• Both I and IV

• Both II and IV

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4