Question 5

Read the following statements about diseases.

(i) They are caused by germs.

(ii) They are caused due to the lack of nutrients in our diet.

(iii) They can be passed on to another person through contact.

(iv) They can be prevented by taking a balanced diet.

Which pair of statements best describes a deficiency disease?

(a) (i) and (ii) .

(b) (ii) and (iii)

(c) (ii) and (iv)

(d) (i) and (iii)

Question 16
Which of the following statements are true about flowers?

(i) Flowers are always bisexual
(ii) They are the sexual reproductive organs
(iii) They are produced in all groups of plants
(iv) After fertilization, they give rise to fruits

(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)

Question 8
Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere in harvesting.
(ii) They help crop plants to grow healthily.
(iii) They compete with crop plants for water, nutrients, space and light.
(iv) They affect plant growth.

Choose the correct combination of statements.
(a) i, iii, iv
(b) iii only
(c) iii, iv
(d) i, ii, iii, iv

Which of the following statements are true for flowers?
(i) flowers are always bisexual
(ii) they contain sexual reproductive organs
(iii) they are produced in all groups of plants
(iv) after fertilisation, they give rise to fruits
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)

Question 17
Which of the following statements are true about unisexual flowers?

(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross-pollination
(iv) Unisexual flowers possessing only stamens cannot produce fruits

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

Question 22
Which of the following statements are true for eukaryotic cells?

(i) They do not have a nuclear membrane.
(ii) They have a well organised nucleus.
(iii) They have a nuclear membrane.
(iv) Blue green algae are eukaryotic cells.

(a) ii and iv
(b) ii and iii
(c) i and ii
(d) i and iv