Nucleus in Cells

Q. Which of the following are not a function of ribosomes?


I. It helps in manufacture of protein molecules
II. It helps in manufacture of enzymes
III. It helps in manufacture of hormones
IV. It helps in manufacture of starch molecules

a. I and II
b. II and III
c. III and IV
d. IV and I

[1 mark]

Q. Which of the following structure is found inside the nucleus?

1. Mitochondria
2. Nucleolus
3. Lysosomes
4. Chloroplasts

Q.

What is the role of nucleus in a cell?

1. It contains the hereditary material

2. It helps in recycling cellular components

3. It synthesises digestive enzymes

4. It regulates the entry and exit of materials in a cell

Q.

Who discovered the cell nucleus?

1. Robert Hooke
2. Robert Swanson
3. Leeuwenhoek

4. Robert Brown

Q. Where inside the cell would you find centrosomes?

1. Chlorophyll
2. Cytoplasm
3. Ribosomes
4. Nucleus

Q. The matrix inside the nucleus in which the chromosomes are embedded is called ___.

1. Protoplasm
2. Nucleoplasm
3. Nucleolus
4. Cytoplasm

Q. Nucleolus is:

1. A rounded structure found in cytoplasm near the nucleus.
2. A rod-shaped structure in the cytoplasm near the nucleus.
3. A rounded structure inside the nucleus bearing rRNA.
4. A rod-shaped structure inside the nucleus.

Q. Microtubules are absent in

1. Centriole
2. Flagella
3. Spindle fibres
4. Mitochondria

Q. Shreya set up an experiment to investigate the outcome when different cell parts of a plant leaf are removed. The result are recorded as shown in the table given.
$\begin{array}{cc}Cellparts& Outcomes\\ P& Thecellcouldnotfunctionproperlyanddied\\ Q& Boiledleafremainedthesamewheniodine\\ & solutionwasaddedtoit.\\ R& Thecellcouldnotcontrolthesubstances\\ & enteringandexitingit\\ S& Thecelllostitsregularshape\end{array}$
Which of the following best represents the cell parts P, Q, R and S?

1. $\begin{array}{ccccc}& P& Q& R& S\\ & Nucleus& Ribosome& Cellwall& Cytoplasm\end{array}$
2. $\begin{array}{ccccc}& P& Q& R& S\\ & Cytoplasm& Chloroplast& Nucleus& Cellmembrane\end{array}$
3. $\begin{array}{ccccc}& P& Q& R& S\\ & Nucleus& Chloroplast& Cellmembrane& Cellwall\end{array}$
4. $\begin{array}{ccccc}& P& Q& R& S\\ & Chloroplast& Nucleus& ER& Cellmembrane\end{array}$

Q. DIRECTIONS: The following questions have four choices (a), (b), (c) and (d) out of which only one is correct. You have to choose the correct alternative.

Which of the following is not the function of nucleus?

1. Makes gene which code for protein
2. Nucleoids are present in prokaryotes
3. Formation of carbohydrates
4. Controls activities of a cell