How do organisms reproduce Worksheet-4

How do organisms reproduce Worksheet-4

 

  1. This is the unicellular organism, which develops protective wall during unfavourable conditions and on getting favourable conditions splits to form many new organisms at the same time. Identify the organism.

A. Paramecium                             B. Amoeba

C. Plasmodium                             D. Leishmania

 

  1. Which of the following statements is/are not true about vegetative propagation in plants?

(i) It makes possible the propagation of some seedless fruit plants like banana, oranges, grapes etc.

(ii) It is the mean to produce genetically identical off-springs.

(iii) It brings more adaptability of plants to the changed environments.

(iv) It brings early flowering and fruiting in plants.

(v) It brings adequate dispersal of vegetative propagules and thus reduces overcrowding.

A. (ii) & (iv)                                    B. (ii), (iv) & (v)

C. (i), (iii) & (iv)                            D. (iii) & (v).

 

  1. In the given flow chart what is the position of fruit?

A. X                     B. Y                     C. Z                     D. Both X & Y

 

  1. Which of the following pairs is incorrectly matched?

A. Rose – Cutting

B. Bougainvillea – Budding

C. Apple – Grafting

D. Grapevine    – Layering

 

  1. Flowers that contain either stamens or carpels but not both are described as unisexual flowers and the plant species having male and female flowers on separate plants are called dioecious plants. Identify the odd one.

A. Papaya                                       B. Mustard

C. Mulberry                                   D. Watermelon

 

  1. Male gamete is the reproductive cell that fuses with female gamete to form zygote. Usually male gametes differ from female gametes as they are :

A. Small and contain stored food

B. Large and motile

C. Large and contain stored food

D. Small and motile

 

  1. Tissue culture is important for certain crops and few commercially important plants. Select the incorrect statement about the advantages of this technique.

A. It takes up relatively little space compared with growing plants in fields

B. It can be carried out independently of seasonal changes of climate

C. It is suitable for propagation of only seedless plants

D. It produces disease free plants

 

  1. The figure given below represents the longitudinal section of a flower. Which of the labelled parts are called as accessory whorls of flower?

A. P & Q             B. Q & R             C. R & S             D. S & T

 

  1. Which of the following is the characteristic of wind pollinated flowers?

A. Pollen grains are light and dry whereas the stigma is long and sticky

B. Flowers are brightly coloured

C. Pollen grains are light, small and dusty whereas the stigma is hairy and feathery

D. Flowers are small with nectar and odour

 

  1. If the pollen grains are transferred from anther to the stigma of the different flower of another plant of same or different species, it is known as:

A. Allogamy

B. Autogamy

C. Cross pollination

D. Both Allogamy & Cross pollination

 

Answer Key:

  1. C
  2. D
  3. B
  4. B
  5. B
  6. D
  7. C
  8. D
  9. C
  10. D