Babar Joya

06/01/2024

اگر زندگی کبھی روشنیوں کا تحفہ دے تو اُنھیں مت بھولنا جنہوں نے کبھی آپکے اندھیرے بانٹے تھے.

26/02/2023

𝐒𝐞𝐞𝐝 𝐇𝐚𝐛𝐢𝐭

1.
Seed habit is a characteristic feature of angiosperms (flowering plants) and gymnosperms (non-flowering seed plants).

2.
A seed is a mature fertilized ovule that contains an embryo plant and a supply of nutrients, protected by a seed coat.

3.
Seeds are formed through sexual reproduction when a pollen grain (male gametophyte) fertilizes an ovule (female gametophyte) in the process of pollination.

4.
Seeds have a number of advantages over other modes of reproduction, including protection from environmental stressors and the ability to disperse over long distances.

5.
Seed dispersal can occur through a variety of mechanisms, including wind, water, animals, and self-dispersal.

6.
Seeds can remain dormant until favorable conditions for growth arise, allowing for survival through unfavorable environmental conditions.

7.
The success of the seed habit has contributed to the evolutionary success of flowering plants and non-flowering seed plants.

𝙁𝙚𝙚𝙡 𝙛𝙧𝙚𝙚 𝙩𝙤 𝙜𝙞𝙫𝙚 𝙮𝙤𝙪𝙧 𝙛𝙚𝙚𝙙𝙗𝙖𝙘𝙠 𝙖𝙣𝙙 𝙝𝙞𝙜𝙝𝙡𝙞𝙜𝙝𝙩 𝙚𝙧𝙧𝙤𝙧𝙨 𝙞𝙛 𝙛𝙤𝙪𝙣𝙙🤗

𝐁𝐚𝐛𝐚𝐫 𝐉𝐨𝐢𝐲𝐚

Tutor/Teacher

25/02/2023

𝐂𝐞𝐥𝐥 𝐂𝐲𝐜𝐥𝐞 𝐂𝐡𝐞𝐜𝐤 𝐏𝐨𝐢𝐧𝐭𝐬

The cell cycle is a complex process that involves a series of tightly regulated events that ensure the proper replication and division of a cell. Cell cycle checkpoints are key regulatory points during the cell cycle that ensure the accurate and faithful completion of each stage before proceeding to the next. Here are some important points about cell cycle checkpoints that you may need to know for a university-level exam:

1.
There are three main checkpoints in the cell cycle: the G1 checkpoint, the G2 checkpoint, and the M checkpoint.

2.
The G1 checkpoint, also known as the restriction point, occurs near the end of the G1 phase and ensures that the cell has sufficient nutrients, energy, and DNA integrity before entering the S phase.

3.
The G2 checkpoint occurs at the end of the G2 phase and ensures that the cell has completed DNA replication and that there are no DNA damage or errors before entering the M phase.

4.
The M checkpoint, also known as the spindle checkpoint, occurs during the metaphase of mitosis and ensures that all chromosomes are properly aligned and attached to the spindle fibers before the cell proceeds to the final stages of mitosis.

5.
The cell cycle checkpoints are controlled by a complex network of proteins and signaling pathways, including cyclins, cyclin-dependent kinases (CDKs), tumor suppressor genes, and checkpoint kinases.

6.
Dysregulation of cell cycle checkpoints can lead to a variety of diseases, including cancer, as uncontrolled cell division can occur when these checkpoints fail.

7.
Cancer treatments often target the cell cycle and cell cycle checkpoints, with chemotherapy drugs often targeting rapidly dividing cells and specific inhibitors being developed to target CDKs and other proteins involved in checkpoint control.

Understanding the mechanisms and regulation of cell cycle checkpoints is crucial for understanding the fundamental processes of cell division and their implications in disease development and treatment.

Feedback will be appreciated 🤗

*Babar Joya*

Tutor/Teacher

25/02/2023

𝙄𝙢𝙥𝙤𝙧𝙩𝙖𝙣𝙩 𝙋𝙤𝙞𝙣𝙩𝙨 𝙖𝙗𝙤𝙪𝙩 𝙀𝙫𝙤𝙡𝙪𝙩𝙞𝙤𝙣 𝙤𝙛 𝙋𝙡𝙖𝙣𝙩𝙨
1.
The first land plants evolved from aquatic green algae around 500 million years ago.

2.
The earliest land plants were nonvascular and lacked roots and leaves.
Vascular plants with true roots, stems, and leaves evolved around 400 million years ago.

3.
The first seed plants evolved around 360 million years ago, allowing for reproduction without water.

4.
The first flowers appeared around 140 million years ago, allowing for more efficient pollination.

5.
The development of fruits around 100 million years ago allowed for the dispersal of seeds by animals.

6.
Plants have evolved a variety of adaptations to survive in different environments, including drought tolerance, fire resistance, and the ability to grow in poor soils.

7.
Humans have selectively bred plants for thousands of years to improve their yield, taste, and other characteristics.
8.
Today, plants are essential to life on Earth, providing oxygen, food, and habitat for countless organisms.

9.
Modern genetic techniques are allowing scientists to study plant evolution and genetics in more detail than ever before.

Feedback will be appreciated 🤗

*Babar Joiya*

25/02/2023

*Gymnosperms*

1.
Gymnosperms are a group of seed-producing plants that are characterized by having naked seeds, meaning that their seeds are not enclosed in an o***y.

2.
Gymnosperms are usually woody plants, and they include some of the largest and oldest living organisms on Earth, such as the giant sequoia trees of California.

3.
The life cycle of gymnosperms typically involves a dominant sporophyte stage, where the plant produces spores that develop into male and female cones.

4.
Gymnosperms reproduce by wind pollination, where pollen grains are carried by the wind to the female cones, where they fertilize the ovules to form seeds.

5.
There are four major groups of gymnosperms: conifers, cycads, Ginkgo biloba, and Gnetophytes.

6.
Conifers are the most diverse and widespread group of gymnosperms, and include trees such as pine, spruce, and fir.

7.
Cycads are palm-like plants that are typically found in tropical and subtropical regions, and are often cultivated as ornamental plants.

8.
Ginkgo biloba is a unique gymnosperm species that is known for its fan-shaped leaves and its medicinal properties.

9.
Gnetophytes are a small group of gymnosperms that are found in tropical and subtropical regions, and include three genera: Gnetum, Ephedra, and Welwitschia.

10.
Gymnosperms have many economic uses, including as sources of lumber, paper, and other wood products, as well as for their medicinal properties and as ornamental plants.

Tutor/Teacher

14/08/2022

Happy 75th Independence day

13/08/2022

"The most difficult thing is the decision to act, the rest is merely tenacity.”

Amelia Earhart

11/08/2022

Don’t tell people your plans. Show them your results.

10/08/2022