11 Cell - the basic unit of life worksheet - Free Printable

Problem Analysis:

The image contains a set of multiple-choice questions related to the topic "Cell – The Basic Unit of Life." These questions test knowledge about the discovery of cells, their components, and unicellular organisms. Below is a detailed explanation and solution for each question.

---

Question 1:

Robert Hooke observed cells in the cork of……………tree.
- Options:
1) Oak
2) Neem
3) Mango
4) All the above

Explanation:
Robert Hooke, an English scientist, first observed cells in 1665 using a microscope he designed. He was examining a thin slice of cork (the outer bark of a tree) and noticed box-like structures, which he called "cells." The cork he used came from an oak tree.

Correct Answer:
1) Oak

---

Question 2:

Nucleus was first observed by:
- Options:
1) Robert Hooke
2) Robert Brown
3) Charles
4) Darwin

Explanation:
The nucleus, which is the control center of the cell, was first observed by Robert Brown, a Scottish botanist, in 1831. He discovered it while studying plant cells under a microscope.

Correct Answer:
2) Robert Brown

---

Question 3:

Brown claimed that the integral part of the cell is:
- Options:
1) Cell Wall
2) Cytoplasm
3) Stomata
4) Nucleus

Explanation:
Robert Brown, who discovered the nucleus, recognized its importance as the central and integral part of the cell. He noted that the nucleus played a crucial role in cellular functions.

Correct Answer:
4) Nucleus

---

Question 4:

Nucleus was first observed in the leaves of:
- Options:
1) Orchid
2) Oak
3) Wheat
4) Rice

Explanation:
Robert Brown first observed the nucleus in the leaves of an orchid plant. This discovery was made during his botanical studies in the early 19th century.

Correct Answer:
1) Orchid

---

Question 5:

The jelly-like substance between nucleus and cell membrane is:
- Options:
1) Cytoplasm
2) Cell organelles
3) Nucleoli
4) All the above

Explanation:
The jelly-like substance inside the cell, located between the nucleus and the cell membrane, is called cytoplasm. It is a semi-fluid material that contains various cell organelles and other cellular components. However, the primary answer here should be the general term "cytoplasm," as it encompasses the entire region.

Correct Answer:
1) Cytoplasm

---

Question 6:

Unicellular organism is:
- Options:
1) Bacteria
2) Chlamydomonas
3) Amoeba
4) All the above

Explanation:
A unicellular organism is an organism composed of only one cell. Examples include:
- Bacteria: Prokaryotic unicellular organisms.
- Chlamydomonas: A type of green algae that is unicellular.
- Amoeba: A protist that is unicellular and well-known for its ability to change shape.

Since all three options are unicellular organisms, the correct answer is "All the above."

Correct Answer:
4) All the above

---

Final Answers:

1. Oak
2. Robert Brown
3. Nucleus
4. Orchid
5. Cytoplasm
6. All the above

Boxed Final Answer:
\[
\boxed{1, 2, 4, 1, 1, 4}
\]