Cell - Structure and Functions Worksheet-4

Cell - Structure and Functions Worksheet-4

1. Sugars are manufactured in:

(a) mitochondria                          (b) ribosomes

(c) chloroplasts                             (d) Golgi apparatus

2. Which of the following has highest resolving power?

(a) UV microscope                       (b) Polarising microscope

(c) Electron microscope             (d) Fluorescent microscope

3. A membranous network of channels which transport materials in a cell is:

(a) mitochondria                          (b) lysosomes

(c) endoplasmic reticulum         (d) chromatin reticulum

4. Organisms in which nuclear material is not bound by a definite nuclear membrane are called:

(a) prokaryotes                             (b) mesokaryotes

(c) eukaryotes                               (d) all of these

5. The similarity between blue-green algae and bacteria in their nuclear organization is that both are:

(a) mesokaryotes                          (b) prokaryotes

(c) eukaryotes                               (d) enucleates

6. The study related to the structure and functioning of cells is known as:

(a) palynology  (b) karyology    (c) cytology       (d) embryology

7. Which of the following is permeable?

(a) Plasma membrane                (b) Tonoplast

(c) Nuclear membrane               (d) Cell wall

8. Which of the following cell organelle is not membrane bound?

(a) Mitochondria                          (b) Lysosomes

(c) Spherosomes                           (d) Ribosomes

9. Besides leucoplasts, starch grains are developed in:

(a) chromoplasts                          (b) chloroplasts

(c) mitochondria                          (d) lysosomes

10. Structure for storage of starch and pigments is/are:

(a) ribosomes   (b) plastids        (c) nucleus        (d) Golgi bodies

11. If the contents of a leaf tissue are carefully fractioned, which of the fraction could be called alive?

(a) Mitochondria                          (b) ER

(c) Cell wall                                   (d) Ribosomes

12. Plastids are absent in:

(a) bacteria                                    (b) nostoc

(c) animal cells                             (d) all of these

13. The region of chromosomes to which spindle fibres are attached is:

(a) centriole                                   (b) chromomeres

(c) centromere                              (d) chromocentre

14. Process of uncoiling of DNA at high temperature is:

(a) replication                               (b) melting

(c) transcription                           (d) reannealing

15. All organelles have double membranes except:

(a) nucleus        (b) lysosomes   (c) chloroplast  (d) mitochondria

Answer Key:

(1)-(c); (2)-(c); (3)-(c); (4)-(a); (5)-(b); (6)-(c); (7)-(d); (8)-(c); (9)-(b); (10)-(b); (11)-(a); (12)-(c); (13)-(c); (14)-(a); (15)-(b)