Question

15. Among the following choose the correct option which contains only biodegradable items? i.

Wood, paper, PVC
ii. Paper, seeds, detergent, iii.

Paper, animal excreta, wood iv.

Wool, leaves, paper

(a) (i), (ii) and (iii)

(b) (i) and (iii)

(c) (ii), (iii) and (iv) (d) (iii) and (iv)

16. Which among the following statements is incorrect in view of the plants?

(a) They convert the solar energy into mechanical energy

(b) They prepare their food from organic compounds

(c) They are also called producers

(d) They are the initial source of energy in a food chain

17. In a food chain the second trophic level is occupied by:

(a) Carnivores

(b) Autotrophs

(c) Herbivores

(d) Producers

18. Green plants utilize ……… percent of sun’s energy to prepare their food by the process of

photosynthesis? (a) 1 percent

(b) 10 percent

(c) 20 percent

(d) 99 percent

19. The process of accumulation of harmful chemical substances like pesticides, in the body of living

organisms at each trophic level of a food chain is known as:

(a) Biological magnification

(b) Biological accumulation

(c) Chemical magnification

(d) Chemical accumulation

20. . Which of the following may be a conclusion of the excessive exposure of humans to sun’s

ultraviolet rays?

i. Peptic ulcers

ii.Eye disease like cataract iii. Damage to lungs iv. Skin cancer

(a) (i) and (iv)
(b) (ii), (iii) and (iv)

(c) (ii) and (iv)

(d) Only (iv)

21. Which among the following is a correct full form for DDT?

(a) Dichlorodiphenyltrichloroethane

(b) Dichlorodiphenyltetrachloroethane (c)

Dichlorodecaphenyltrichloroethane

(d) Dichlorodiethyltrichloroethane

22. What will happen if deer is missing in the food chain given below?

Grass → Deer → Tiger

(a) The population of tiger increases

(b) The population of grass decreases

(c) Tiger will start eating grass

(d) The population of tiger decreases and the population of grass increases

23. Global warming is a phenomenon related to:

(a) Evaporation

(b) Ecological balance

(c) Greenhouse effect

(d) Desertification

Ch – How do organisms reproduce?

1. Fruits are formed from

a. Stamen

b. Stigma

c. Ovary

d. Ovule

2. Which among the following is a unicellular organism that reproduces by

budding? (a) Hydra

(b) Planaria

(c) Yeast

(d) Spirogyra

3. Which among the following does not reproduce by spore formation:

(a) Penicillium fungus

(b) Yeast fungus

(c) Mucor fungus

(d) Rhizopus fungus

4. The rapid spreading of bread mould on slices of bread are due to:
(i) Presence of large number of spores in air

(ii) Presence of large number of thread-like branched hyphae

(iii) Presence of moisture and nutrients

(iv) Formation of round shaped sporangia

(a) (i) and (iii)

(b) (ii) and (iv)

(c) (i) and (ii)

(d) (iii) and (iv)

5. The asexual reproduction in the Spirogyra involves:

(a) Breaking up of filaments into smaller bits

(b) Division of a cell into many cells

(c) Division of a cell into two cells

(d) Formation of a large number of buds

6 Reason for the greater similarities among the off springs produced by asexual

reproduction, is:

(i) Asexual reproduction involves only one parent

(ii) Asexual reproduction involves two parents

(iii) Asexual reproduction involves gametes

(iv) Asexual reproduction does not involve gametes

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iv)

(d) (i) and (iv)

7. The process of the division of cell into several cells during reproduction in

Plasmodium is termed as:

(a) Fragmentation

(b) Budding

(c) Multiple fission

(d) Binary fission

8. The number of chromosomes in parents and off springs of a particular species

remains constant due to:

(a) Doubling of chromosomes after zygote formation

(b) Halving of chromosomes during gamete formation

(c) Doubling of chromosomes after gamete formation

(d) Halving of chromosomes after gamete formation

9. A Planaria worm is cut horizontally in the middle into two halves P and Q such

that the part P contains the whole head of the worm. Another Planaria worm is

cut vertically into two halves R and S 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 respective worms?

(a) Only P

(b) Only R and S

(c) P, Rand S

(d) P, Q, R and S

10. The number of chromosomes in both parents and off springs of a particular

species remains constant because: (a) Chromosomes get doubled after zygote

formation

(b) Chromosomes get doubled after gamete formation

(c) Chromosomes get halved during gamete formation
(d) Chromosomes get halved after gamete formation
​ OF CLASS 10 BIOLOGY​

Answer 1

Answer:

paper ,animal ,detergent

only p

(b) Chromosomes get doubled after gamete formation

(c) Chromosomes get halved during gamete formation

(d) Chromosomes get halved after gamete formation